18-electrotehnica.pdf
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examen anr certificat capacitateTRANSCRIPT
1.Regulatorul automat formeaza:
2.Elementul de comparatie formeaza:
3.Traductorul de reactie formeaza:
4.In cazul unui sistem automat de reglare, ordinea elementelor de pe calea directa este:
5.In cazul unui sistem automat de reglare, ordinea elementelor de pe calea directa este:
1. marimea de executie; nmlkj2. marime de comanda; nmlkj3. marimea de eroare; nmlkj4. marimea de reactie. nmlkj
1. marimea de executie; nmlkj2. marimea de comanda; nmlkj3. marimea de eroare; nmlkj4. marimea de reactie. nmlkj
1. marimea de executie; nmlkj2. marimea de comanda; nmlkj3. marimea de eroare; nmlkj4. marimea de reactie. nmlkj
1. element de executie, proces, regulator automat; nmlkj2. proces, element de executie, regulator automat; nmlkj3. regulator automat, proces, element de executie; nmlkj4. regulator automat, element de executie; nmlkj
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6.Daca un sistem automat functioneaza cu eroare finita si nenula, atunci:
7.In cazul unui sistem automat influenta unei marimi perturbatoare este minima daca:
8.In cazul unui sistem automat, influenta unei marimi perturbatoare este maxima daca:
9.Elementele cu functiile de transfer H1(s) si H2(s) sunt conectate in paralel daca:
1. traductor de intrare, element de executie, regulator automat nmlkj2. proces, element de executie, regulator automat, traductor de reactie; nmlkj3. regulator automat, proces, traductor de reactie, element de executie; nmlkj4. traductor de intrare, regulator automat, element de executie, proces; nmlkj
1. eroarea este direct proportionala cu factorul total de transfer; nmlkj2. eroarea nu depinde de factorul total de transfer; nmlkj3. eroarea este invers proportionala cu factorul total de transfer; nmlkj4. eroarea depinde de constantele de timp ale sistemului. nmlkj
1. sistemul nu are reactie; nmlkj2. sistemul are reactie pozitiva; nmlkj3. sistemul are reactie negativa; nmlkj4. sistemul este de comanda. nmlkj
1. sistemul are reactie negativa rigida; nmlkj2. sistemul are reactie negativa elastica; nmlkj3. sistemul are reactie negativa; nmlkj4. sistemul este de comanda. nmlkj
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10.Elementele cu functiile de transfer H1(s) si H2(s) sunt conectate in serie daca:
11.Elementele cu functiile de transfer H1(s) si H2(s) fac parte dintr-o conexiune cu reactie:
12.H(s)reprezinta functia de transfer a unui sistem cu reactie unitara daca:
13.H(s)reprezinta functia de transfer a unui sistem cu reactie neunitara
1. H(s) = H1(s) +H2(s) nmlkj2. H(s) = H1(s) -H2(s) nmlkj3. H(s) = H1(s) *H2(s) nmlkj4. H(s) = H1(s)/H2(s) nmlkj
1. H(s) = H1(s) +H2(s) nmlkj2. H(s) = H1(s) -H2(s) nmlkj3. H(s) = H1(s) *H2(s) nmlkj4. H(s) = H1(s)/H2(s) nmlkj
1. H(s) = H1(s) +H2(s) nmlkj2. H(s) = H1(s) -H2(s) nmlkj3. H(s) = H1(s) *H2(s) nmlkj4. H(s) = H1(s)/(1+H1(s)*H2(s) nmlkj
1. H(s) = H1(s)/(1+H2(s) nmlkj2. H(s) = H1(s)/(1+H1(s) nmlkj3. H(s) = H1(s) *H2(s) nmlkj4. H(s) = H1(s)/(1+H1(s)*H2(s) nmlkj
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daca:
14.Se dau urmatoarele functii de transfer de regulatoare automate: H1(s) =k; H2(s)=k(1+Ts); H3 (s) =k [1+1/(Ts)]; H4(s)=k[1+Ts+1/(Ts)]. Functiile de transfer ce contin efectul proportional sunt:
15.Se dau urmatoarele functii de transfer de regulatoare automate: H1(s) =k; H2 (s)=k(1+Ts); H3 (s) =k [1+1/(Ts)]; H4(s)=k[1+Ts+1/(Ts)]. Functiile de transfer ce contin efectul integral sunt:
16.Se dau urmatoarele functii de transfer de regulatoare automate: H1(s) =k; H2 (s)=k(1+Ts); H3 (s) =k [1+1/(Ts)]; H4(s)=k[1+Ts+1/(Ts)]. Functiile de transfer ce contin efectul derivativ sunt:
1. H(s) = H1(s)/(1+H2(s) nmlkj2. H(s) = H1(s)/(1+H1(s) nmlkj3. H(s) = H1(s) *H2(s) nmlkj4. H(s) = H1(s)/(1+H1(s)*H2(s) nmlkj
1. H1(s); nmlkj2. H1(s) si H2(s) nmlkj3. H1(s);H2(s) si H3(s) nmlkj4. H1(s);H2(s);H3(s) si H4(s) nmlkj
1. H1(s); nmlkj2. H2(s) nmlkj3. H3(s) si H4(s) nmlkj4. H1(s) si H2(s); nmlkj
1. H1(s); nmlkj
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17.Se dau urmatoarele functii de transfer de regulatoare automate: H1(s) =k; H2 (s)=k(1+Ts); H3 (s) =k [1+1/(Ts)]; H4(s)=k[1+Ts+1/(Ts)]. Functiile de transfer ce contin efectul integral si derivativ sunt:
18.Daca un sistem automat functioneaza cu eroare nula, atunci:
19.Pe durata functionarii unui sistem automat stabil:
20.Pentru o intrare treapta, in regim permanent, in cazul unui sistem automat liniar si continuu stabil:
2. H3(s) nmlkj3. H2(s) si H4(s) nmlkj4. H1(s) si H3(s) nmlkj
1. H1(s); nmlkj2. H2(s) nmlkj3. H3(s) nmlkj4. H4(s) nmlkj
1. functia de transfer contine un pol in origine; nmlkj2. functia de transfer nu contine un pol in origine; nmlkj3. functia de transfer este constanta; nmlkj4. functia de transfer contine o constanta de timp principala. nmlkj
1. eroarea este finita; nmlkj2. eroarea este constanta in timp; nmlkj3. marimea de executie este constanta in timp; nmlkj4. marimea de comanda este constanta in timp. nmlkj
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21.In cazul unui sistem automat liniar si continuu, stabilitatea sistemului depinde de:
22.In cazul unui sistem automat liniar si continuu, rezerva de stabilitate:
23.Alegeti afirmatia corecta:
24.Alegeti afirmatia corecta:
1. marimea de executie este constanta in timp; nmlkj2. marimea de iesire scade constant in timp; nmlkj3. marimea de iesire creste constant in timp; nmlkj4. marimea de iesire este constanta in timp; nmlkj
1. tipul marimii de intrare; nmlkj2. amplitudinea marimii de intrare; nmlkj3. pozitia polilor sistemului in planul complex; nmlkj4. amplitudinea marimii de iesire nmlkj
1. creste cand factorul total de transfer creste; nmlkj2. nu depinde de factorul total de transfer; nmlkj3. scade, cand factorul total de transfer creste; nmlkj4. depinde tipul marimii de intrare. nmlkj
1. corectia elastica actioneaza numai in regim tranzitoriu; nmlkj2. corectia rigida actioneaza numai in regim tranzitoriu; nmlkj3. corectia elastica actioneaza numai in regim permanent; nmlkj4. corectia elastica actioneaza tot timpul nmlkj
1. corectia elastica actioneaza numai in regim permanent; nmlkj
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25.In cazul unui element de intarziere de ordinul I, prin introducerea corectia rigide:
26.Sistemul automat care nu poate fi stabil este:
27.Pentru un sistem stabil cu intrare treapta, raspunsul este:
28.Reactia negativa elastica influenteaza urmatoarele performante ale unui sistem automat:1. eroarea stationara; 2. gradul de amortizare; 3. suprareglajul; 4. gradul de amortizare.
2. corectia rigida actioneaza numai in regim tranzitoriu; nmlkj3. corectia rigida actioneaza numai in regim permanent; nmlkj4. corectia rigida actioneaza tot timpul; nmlkj
1. constanta de timp si factorul de transfer se micsoreaza; nmlkj2. constanta de timp creste, iar factorul de transfer scade; nmlkj3. constanta de timp si factorul de transfer cresc; nmlkj4. constanta de timp scade, iar factorul de transfer creste; nmlkj
1. sistemul cu reactie pozitiva; nmlkj2. sistemul cu reactie negativa; nmlkj3. sistemul cu reactie negativa unitara; nmlkj4. sistemul cu reactie negativa elastica; nmlkj
1. periodic amortizat; nmlkj2. periodic amplificat; nmlkj3. periodic intretinut; nmlkj4. periodic nemarginit; nmlkj
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29.Se da un sistem automat inchis cu reactie unitara care, in stare deschisa, are urmatoarea functie de transfer: aut29.mht. Sistemul este stabil pentru:
30.Se da un sistem automat inchis cu reactie unitara care, in stare deschisa, are urmatoarea functie de transfer: aut30.mht. Sistemul este stabil pentru:
31.
1. 1 si 4; nmlkj2. 2 si 3; nmlkj3. 1,2 si 3; nmlkj4. 2,3 si 4. nmlkj
1. K<0; nmlkj2. K=0; nmlkj3. 0 nmlkj4. K>11. nmlkj
1. K<0; nmlkj2. K=0; nmlkj3. aut30c.mht nmlkj4. K>0. nmlkj
Se dă un sistem automat închis cu reacţie unitară care, în stare deschisă, are următoarea funcţie de transfer: H(s)=K/s2)]. Sistemul este stabil pentru:
1. aut31a.mht; nmlkj2. K=0; nmlkj
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32.Cu ajutorul criteriului Kessler, problema acordarii unui regulator automat poate fi rezolvata cu un regulator tipizat numai daca functia de transfer a partii fixate contine:1.o constanta de timp principala;2. doua constante de timp principale; 3. mai mult de doua constante de timp principale. Afirmatiile adevarate sunt:
33.Utilizarea unei scheme de reglare in casca presupune urmatoarele: 1. utilizarea de mai multe regulatoare automate; 2. marimile intermediare ce apar prin divizarea partii fixate sa fie usor masurabile; 3. pret de cost redus; 4. timp redus de anulare a efectelor marimilor perturbatoare. Afirmatiile adevarate sunt:
34.Un sistem multivariabil presupune:
3. 0 nmlkj4. K>11. nmlkj
1. 1 si 3; nmlkj2. 2 si 3; nmlkj3. 3; nmlkj4. 1 si 2 nmlkj
1. 1,2 si 3; nmlkj2. 1,2 si 4; nmlkj3. 2 si 3; nmlkj4. 1 si 3. nmlkj
1. marime de intrare care poate lua mai multe valori; nmlkj2. marime de iesire care poate lua mai multe valori; nmlkj3. mai multe marimi de intrare si/sau mai multe marimi de iesire; nmlkj4. marime de iesire si o marime de iesire care poate lua mai multe valori. nmlkj
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35.Termorezistenta:
36.Termorezistenta este:
37.Termocuplul:
38.Daca temperatura apei de racire la cilindrii motorului principal naval ia valori intre 40 grade C si 80 grade C, traductorul de temperatura care poate fi folosit, astfel incat timpul de raspuns sa fie cat mai mic, este?
1. genereaza o tensiune atunci cand temperatura variaza; nmlkj2. rezista la temperaturi inalte; nmlkj3. este o rezistenta variabila cu temperatura; nmlkj4. este o rzistenta ce nu se modifica cu temperatura. nmlkj
1. rezistenta de incalzire; nmlkj2. un releu termic; nmlkj3. un traductor de temperatura; nmlkj4. un traductor rezistiv nmlkj
1. genereaza o tensiune atunci cand temperatura variaza; nmlkj2. genereaza un cuplu; nmlkj3. este o rezistenta variabila cu temperatura; nmlkj4. se deformeaza cu temperatura nmlkj
1. termocuplul; nmlkj2. termorezistenta; nmlkj3. termistorul; nmlkj4. pirometrul de radiatie. nmlkj
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39.In functionarea pirometrelor de radiatie totala si a celor de radiatie partiala sunt de semnalat urmatoarele aspecte comune:
40.Functionarea pirometrelor de radiatie totala se bazeaza pe:
41.Termocuplul genereaza o tensiune termoelectromotoare daca:
42.Utilizarea conductoarelor de compensatie este necesara daca:
1. la ambele aparate modificarea sensibilitatii se obtine cu ajutorul unor diafragme;
nmlkj
2. cele doua aparate folosesc lampi cu incandescenta la care filamentul este din wolfram;
nmlkj
3. utilizeaza ca elemente termosensibile termocuplurile; nmlkj4. folosesc un sistem de lentile care permite pozitionarea corecta a aparatului. nmlkj
1. dependinta dintre culoarea corpului si energia radiatiei absorbite; nmlkj2. dependenta dintre frecventa undei incidente si indicele de refractie al
mediului; nmlkj
3. dependenta dintre energia radiatiei emisa de corpuri si temperatura acestora;
nmlkj
4. dependenta dintre frecventa radiatiei reflectate si viteza de deplasare a corpului.
nmlkj
1. este realizat din materiale semiconductoare diferite si capetele libere au aceeasi temperatura cu a punctului de sudura;
nmlkj
2. este realizat dintr-un metal si un aliaj metalic care au potentiale de reducere diferite;
nmlkj
3. intre jonctiunea de masurare si cea de referinta exista o diferenta de temperatura;
nmlkj
4. intre jonctiunea calda si cea de referinta exista o diferenta de potential. nmlkj
1. intre punctul de masurare si cel de indicare al rezultatului este o distanta ce nmlkj
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43.Pentru masurarea temperaturii apei de racire la cilindrii motorului principal naval sunt utilizate:
44.Platina utilizata la realizarea termorezistoarelor metalice:
45.Temperatura gazelor de evacuare la turbosuflanta este de ordinul sutelor de grade Celsius. Pentru masurare sunt folosite:
46.Masurarea temperaturilor se poate face pe baza unor efecte fizice datorate variatiilor de temperatura:1. Variatia rezistentei semiconductoarelor;2. Modificarea frecventei de reyonanta a cristalelor
2. intre jonctiunea de referinta si cea de masurare este o diferenta de potential prea mare;
nmlkj
3. se urmareste eliminarea influentei temperaturii mediului ambiant; nmlkj4. nu se dispune de o incinta termostatata pentru jonctiunea de referinta. nmlkj
1. termorezistoarele metalice; nmlkj2. pirometrele de radiatie; nmlkj3. cristalele de cuart; nmlkj4. bimetalele. nmlkj
1. se oxideaza repede la temperaturi inalte; nmlkj2. are liniaritate buna; nmlkj3. are coeficient de temperatura foarte mare; nmlkj4. are inertie termica foarte mica nmlkj
1. termometrele de cuart; nmlkj2. termometrele cu bimetal; nmlkj3. termometrele cu termocuplu; nmlkj4. termometrele cu termistoare. nmlkj
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de cuart; 3. Modificarea permitivitatii electrice e0. Care afirmatie este falsa?
47.Traductoarele rezistive reostatice sunt utilizate pentru masurarea 1) nivelului; 2) temperaturilor inalte; 3) deplasarilor mici; 4) turatiilor; 5) umiditatii. Afirmatiile adevarate sunt:
48.Printre traductoare de temperatura frecvent utilizate sunt si termistoarele caracterizate prin: 1) coeficient de temperatura negativ; 2) coeficient de temperatura pozitiv; 3) lege liniara de variatie a rezistentei cu temperatura; 4) inertie termica ridicata; rezistenta la temperatura de referinta RT0 extrem de scazuta. Afirmatiile adevarate sunt:
49.In legatura cu utilizarea termocuplurilor in instalatiile de supraveghere si masurare a temperaturilor, se face urmatoarea precizare:
1. 1; nmlkj2. 2; nmlkj3. 3; nmlkj4. 4. nmlkj
1. 1 si 5; nmlkj2. 2 si 3; nmlkj3. 1 si 4; nmlkj4. 1 si 3. nmlkj
1. 5 si 4; nmlkj2. 4 si 3; nmlkj3. 3 si 2; nmlkj4. 1 si 2. nmlkj
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50.Despre termocupluri utilizate ca traductoare de temperatura se afirma:1. functionarea se bazeaza pe efectul termodinamic; 2. tensiunea generala depinde de diferenta de temperatura dintre cele doua jonctiuni; 3. tensiunea generala depinde de curentii prin cele doua materiale din care este realizat termocuplul; 4. tensiunea generata depinde de diferenta de potential dintre cele doua jonctiuni; 5. sensibilitatea este de ordinul zecilor de microvolti pe grad Celsius. afirmatiile adevarate sunt:
51.Functionarea traductoarelor de nivel cu flotor cu magnet permanent se bazeaza pe:1. modificarea rezistentei unei bobine la trecerea flotorului prin dreptul acesteia; 2. modificarea permeabilitatii magnetice m0 reluctantei; 3. modificarea reluctantei circuitului magnetic din care face parte bobina; 4. modificarea reactantei capacitive; 5. modificarea inductantei bobinei. Afirmatiile adevarate sunt:
1. sunt realizate din materiale cu coeficient de temperatura ridicat; nmlkj2. sunt realizate din materiale semiconductoare diferite; nmlkj3. daca se dispune de o incinta termostatata, conductoarele de compensatie nu
mai sunt necesare; nmlkj
4. conductoarele de compensatie pot fi realizate din materiale diferite, sau din aceleasi materiale ca ale termocuplului.
nmlkj
1. 1 si 2; nmlkj2. 2 si 3; nmlkj3. 4 si 5; nmlkj4. 2 si 5; nmlkj
1. 1 si 2; nmlkj2. 3 ; nmlkj3. 1 si 4; nmlkj4. 4. nmlkj
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52.Turatia poate fi masurata cu ajutorul:1.tahometrelor de curenti turbionari; 2.turometrelor cu termocuplu; 3. tahometrelor cu traductoare Hall; 4. tahometrelor cu burduf; 5. tahometrelor pirometrice. Afirmatiile adevarate sunt:
53.In legatura cu utilizarea traductoarelor de turatie se fac afirmatiile: 1. Tahogeneratoarelor de curent continuu permit stabilirea sensului de rotatie; 2. Cuplul activ la tahometrele de curenti turbionari este proportional cu numarul perechilor de poli si invers proportionali cu turatia; 4. traductoarele Hall permit masurarea turatiei intr-o gama larga de valori ale acesteia; 5. valoarea medie a impulsurilor obtinute la utilizarea traductoarelor fotosensibile pentru masurarea deplasarilor mici. Afirmatiile adevarate sunt:
54.Despre traductoarele rezistive reostatice se fac afirmatiile: 1.sunt realizate prin bobinarea pe un suport izolator a unui conductor subtire (30… 100mm)din constantan sau manganina; 2. pragul de sensibilitate se exprima in spire pe milimetru; 3. sensibilitatea creste daca sunt realizate din semiconductoare cu rezistivitate scazuta; 4. in cazul potentiometrelor bobinate, variatia rezistentei se realizeaza in mod continuu; 5. sunt utilizate pentru masurarea grosimilor si deplasarilor mici. afirmatiile adevarate sunt:
1. 1 si 2; nmlkj2. 2 si 3; nmlkj3. 1 si 3; nmlkj4. 4 si 5. nmlkj
1. 5 si 2; nmlkj2. 4 si 5; nmlkj3. 2; nmlkj4. 1 si 4. nmlkj
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55.La utilizarea traductoarelor inductive diferentiale cu modificare geometriei si circuit magnetic inchis: 1. se prefera alimentarea puntii in curent continuu pentru a obtine un factor de calitate ridicat; 2. se prefera alimentarea in curent continuu pentru a se reduce pierderile in fier; 3. se asigura un raspuns liniar pentru deplasari cuprinse in intervalul asigura un raspuns liniar pentru deplasari cuprinse in intervalul 1 mm ... 1 mm; 4. cresterea frecventei tensiunii de alimentare conduce la scaderea factorului de calitate. Afirmatiile adevarate sunt:
56.Despre traductoarele inductive simple cu modificarea geometriei si circuit magnetic inchis se fac afirmatiile: 1.deplasarea armaturii mobile determina modificarea inductantei; 2. deplasarea armaturii mobile determina modificarea reluctantei magnetice; 3. caracteristica de transfer este liniara; 4 sunt utilizate pentru masurarea deplasarilor relativ mari de ordinul centimetrilor; 5. caracteristica de transfer este hiperbolica. Afirmatiile adevarate sunt:
57.Traductoarele capacitive cu modificarea distantei dintre armaturi:1.
1. 2 si 3; nmlkj2. 4 si 5; nmlkj3. 4; nmlkj4. 1 si 5; nmlkj
1. 1 si 2; nmlkj2. 3; nmlkj3. 2; nmlkj4. 2 si 4. nmlkj
1. 1 si 3; nmlkj2. 4 si 5; nmlkj3. 2 si 3; nmlkj4. 2 si 5; nmlkj
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au caracteristica liniara; 2. sunt folosite pentru masurarea deplasarilor mici 1 mm…100mm; 3. deplasarea armaturii determina modificarea permeabilitatii dielectricului; 4. sunt realizate sub forma unor condesatoare cilindrice; 5. sunt folosite pentru masurarea deplasarilor mari. afirmatiile adevarate sunt:
58.Termocuplul este:
59.Tahogeneratorul este un:
60.Sistemele de reglare automata a tensiunii (S.R.A.T.) pentru generatoarele sincrone navale, care realizeaza stabilizarea valorii tensiunii la o anumita valoare prescrisa sunt cele:
1. 2; nmlkj2. 4 si 5; nmlkj3. 1 si 3; nmlkj4. 3 si 5. nmlkj
1. un termocuplu de cuplu; nmlkj2. un traductor de temperatura; nmlkj3. un element de cuplaj rezistent la temperatura; nmlkj4. un releu termic. nmlkj
1. traductor de tensiune; nmlkj2. traductor de turatie; nmlkj3. traductor rezistiv; nmlkj4. traductor de curent. nmlkj
1. cu compundare dupa curent; nmlkj
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61.In cazul a doua generatoare sincrone navale cuplate in paralel, incarcate la sarcina nominala, daca la un generator se defecteaza regulatorul automat de tensiune, atunci:
62.Urmatoarea schema: aut62.mht corespunde unui regulator:
63.Urmatoarea schema: aut63.mht corespunde unui regulator:
2. inchise cu reactie negativa care functioneaza dupa abatere; nmlkj3. cu compundare dupa faza; nmlkj4. inchise cu reactie pozitiva care functioneaza dupa abatere. nmlkj
1. scade valoarea tensiunii la barele T.P.D. cu aproximativ 20%; nmlkj2. este decuplat generatorul al carui regulator este defect; nmlkj3. sunt decuplate ambele generatoare; nmlkj4. primul generator preia sarcina celui de al doilea generator. nmlkj
1. proportional; nmlkj2. proportional-integrator; nmlkj3. proportional -derivativ; nmlkj4. proportional-integrator-derivativ. nmlkj
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64.Urmatoarea schema: aut64.mht corespunde unui regulator:
65.Urmatoarea schema: aut65.mht corespunde unui regulator:
66.Prin utilizarea capacitatii C2, in schema aut66.mht se obtine un efect:
1. proportional; nmlkj2. proportional-integrator; nmlkj3. proportional -derivativ; nmlkj4. proportional-integrator-derivativ. nmlkj
R
R
C2
1. proportional; nmlkj2. proportional-integrator; nmlkj3. proportional -derivativ; nmlkj4. proportional-integrator-derivativ. nmlkj
1. proportional; nmlkj2. proportional-integrator; nmlkj3. proportional -derivativ; nmlkj4. proportional-integrator-derivativ. nmlkj
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67.Prin utilizarea capacitatii C1, in schema aut67.mht se obtine un efect:
Maximizeaza
68.Pentru regulatorul automat din urmatoarea schema aut68.mht constanta de proportionalitate este:
R
C2
1. proportional; nmlkj2. integrator; nmlkj3. derivativ; nmlkj4. proportional-derivativ. nmlkj
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1. proportional; nmlkj2. integrator; nmlkj3. derivativ; nmlkj4. proportional-derivativ. nmlkj
R
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69.Pentru regulatorul automat din urmatoarea schema aut69.mht constanta de de timp de integrare este:
70.Pentru regulatorul automat din urmatoarea schema aut70.mht constanta de timp de derivare este:
71.Protectia motorului principal la "ceata de ulei in carter":
1. KRA = R1/R2; nmlkj2. KRA=R2/R1; nmlkj3. KRA=R1+R2; nmlkj4. KRA=R1*R2. nmlkj
1. Ti=(R1 +R2)* C2; nmlkj2. Ti= R2*C2; nmlkj3. Ti+R1*C2; nmlkj4. Ti=R1/C2. nmlkj
R
R
1. Ti=(R1 +R2)* C1; nmlkj2. Ti= R2*C1; nmlkj3. Ti+R1*C1; nmlkj4. Ti=R1/C1. nmlkj
1. opreste motorul principal; nmlkj2. semnalizeaza in pupitrul de comanda si semnalizare motor principal; nmlkj
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72.Detectorul de "ceata de ulei" din carterul motorului principal poate fi tip:
73.Indicarea la distanta a turatiei motorului principal se face cu:
74.In cazul aparitiei suprasarcinii la motorul principal de la o nava cu elice cu pas variabil:
75.Pompele care deservesc motorul principal pot fi:
3. a+b; nmlkj4. opreste Diesel/generatorul; nmlkj
1. comparator; nmlkj2. nivel (level); nmlkj3. a+b; nmlkj4. reparator. nmlkj
1. instalatia de tahometre; nmlkj2. instalatia de tahorelele; nmlkj3. instalatia de presostate; nmlkj4. b+c. nmlkj
1. se opreste motorul principal; nmlkj2. se reduce pasul elicei; nmlkj3. se supraalimenteaza masina de pas; nmlkj4. se opreste pasul elicei; nmlkj
1. pompe duble, una in functionare si alata de rezerva; nmlkj2. pompe simple; nmlkj
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76.In cele mai multe cazuri pompele de rezerva ce deservesc motorul principal pornesc automat la:
77.Comanda de la distanta a turatiei motorului auxiliar ( diesel-generatorului) se face cu ajutorul:
78.In cazul lipsei flacarii la functionarea pe automat a caldarinei cu arzator:
79.In cazul aparitiei nivelului minim de avarie al apei din caldarina
3. pompe centrifuge; nmlkj4. a+c. nmlkj
1. scaderea temperaturii fluidului; nmlkj2. scaderea presiunii fluidului de la pompele in functiune; nmlkj3. scaderea turatiei motorului electric; nmlkj4. a+b. nmlkj
1. unui comutator din T.P.D. sau a unui contactor care primeste informatii de la blocurile de cuplare automata in paralel;
nmlkj
2. unui comutator din pupitrul motorului principal; nmlkj3. a+b; nmlkj4. schimbatoare de sens. nmlkj
1. se opreste caldarina; nmlkj2. se blocheaza instalatia de automatizare; nmlkj3. a+b; nmlkj4. se porneste ventilatorul; nmlkj
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80.Caldarina recuperatoare este montata:
81.In cazul aparitiei suprasarcinii la pompa din circuitul hidraulic de forta al masinii carmei:
82.Masurarea timpului de bandare al carmei la navele de transport maritim, dintr-un bord in altul se face de la:
83.Instalatia electrohidraulica de la masina carmei este prevazuta pentru limitarea unghiului de bandare cu:
1. se opreste caldarina; nmlkj2. se porneste pompa de alimentare cu combustibil; nmlkj3. se opreste furnizarea aburului; nmlkj4. b+c. nmlkj
1. pe sistemul de evacuare gaze al motorului principal: nmlkj2. pe sistemul de evacuare al caldarinei cu arzator nmlkj3. a+b; nmlkj4. pe axul motorului principal. nmlkj
1. se opreste motorul electric de actionare; nmlkj2. se semnalizeaza la distanta (timonerie) optic; nmlkj3. se semnalizeaza in timonerie acustic; nmlkj4. se semnalizeaza in timonerie optic si acustic, cu anularea semnalizarii
acustice si porneste pompa de rezerva. nmlkj
1. 35 grade intr-un bord la 35 grade in celalalt bord; nmlkj2. 35 grade intr-un bord la 30 grade in celalalt bord; nmlkj3. 25 grade intr-un bord la 20 grade in celalalt bord; nmlkj4. 35 grade intr-un bord la 30 grade in celalalt bord cu toata viteza inainte; nmlkj
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84.Instalatia frigorifica de cambuza este prevazuta cu:
85.Instalatia telegrafului masina este folosita pentru:
86.Cu ce presostat se asigura protectia la trecerea freonului in carterul compresorului din instalatia frigorifica?
87.Care este presostatul care asigura pornirea si oprirea automata a compresorului din instalatia frigorifica navala?
1. limitatori pe sistemul electric; nmlkj2. limitatori pe sistemul mecanic si hidraulic; nmlkj3. limitatori fixati pe elice; nmlkj4. a+b nmlkj
1. presostate de inalta presiune: nmlkj2. presostate diferentiale; nmlkj3. presostate de lucru, de inalta presiune si diferentiale; nmlkj4. a+b. nmlkj
1. transmiterea comenzilor din timonerie in postul central de comanda masini, referitoare la motorul principal;
nmlkj
2. transmiterea erorilor de viteza; nmlkj3. transmiterea informatiilor in CM; nmlkj4. b+c. nmlkj
1. cu presostatul diferential; nmlkj2. cu presostatul de apa de racire; nmlkj3. cu presostatul de lucru; nmlkj4. cu presostatul de joasa presiune. nmlkj
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88.Cu ce se comanda oprirea automata a intrarii freonului in compartimentul de carne in care s-a realizat temperatura prescrisa?
89.Ce instalatie indica pozitia reala a penei carmei?
90.Masina carmei de la navele maritime de mare tonaj poate avea actionarea principala:
91.Pilotul automat respecta, in majoritatea cazurilor, drumul indicat de:
1. de lucru (joasa presiune) nmlkj2. de ulei; nmlkj3. de apa de racire; nmlkj4. de inalta presiune. nmlkj
1. cu un termostat plasat in camera frigorifica care comanda o electrovalvula; nmlkj2. cu un presostat care comanda o electrovalvula; nmlkj3. cu un termocuplu din vaporizator; nmlkj4. cu un presostat de inalta presiune nmlkj
1. instalatia de repetitoare de drum; nmlkj2. instalatia de axiometre; nmlkj3. instalatia tahometrelor; nmlkj4. instalatia repetitoarelor giro. nmlkj
1. electrohidraulica; nmlkj2. manuala; nmlkj3. electrica; nmlkj4. electromagnetica. nmlkj
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92.Cu ce se asigura protectia la lipsa apei din caldarina?
93.Cu ce se sesizeaza automat lipsa flacarii de la o caldarina cu arzator?
94.Ce trebuie sa se faca la o caldarina cu arzator pentru preintampinarea unei explozii in arzator?
95.Cu ce se comanda pornirea si oprirea automata a unei caldarine cu arzator?
1. un repetitor de la girobusola; nmlkj2. compasul magnetic; nmlkj3. un repetitor de la masina carmei; nmlkj4. un repetitor de la masina de pas. nmlkj
1. cu un presostat; nmlkj2. cu un semnalizator de nivel; nmlkj3. cu un termostat; nmlkj4. cu un termocuplu. nmlkj
1. o fotodioda; nmlkj2. un fotorepetitor; nmlkj3. un selsin; nmlkj4. termoregulator. nmlkj
1. recircularea apei; nmlkj2. preventilarea si postventilarea camerei de ardere; nmlkj3. scaderea presiunii aburului; nmlkj4. postventilarea camerei de ardere; nmlkj
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96.Ce se poate produce cand apar gaze nearse in focarul caldarinei?
97.Cu ce se sesizeaza aparitia freonului in carterul compresorului din instalatia frigorifica navala?
98.Cu ce se masoara, la distanta, temperaturile de pe circuitele de evacuare a gazelor de la motoarele principale?
99.Care este ordinea de amplasare a limitatoarelor pentru oprirea penei carmei cand aceasta ajunge in pozitia de bandare maxima in unul din borduri?
1. cu un presostat montat pe circuitul de abur al caldarinei: nmlkj2. cu un termostat montat pe circuitul de abur al caldarinei; nmlkj3. cu un termocuplu din instalatia arzatorului; nmlkj4. cu un presostat montat pe circuitul de apa al caldarinei. nmlkj
1. o explozie in focar la pornirea caldarinei; nmlkj2. oprirea pompei de combustibil; nmlkj3. oprirea pompei de alimentare cu apa; nmlkj4. o explozie in domul caldarinei; nmlkj
1. cu un presostat diferential montat intre aspiratie si carterul compresorului; nmlkj2. cu un presostat diferential montat intre refulare si carterul compresorului; nmlkj3. cu un presostat de joasa presiune din carter; nmlkj4. cu un presostat de inalta presiune din carter; nmlkj
1. cu termocuple si o instalatie adecvata; nmlkj2. cu termorezistente si o instalatie adecvata; nmlkj3. cu piezoelectrice si o instalatie adecvata; nmlkj4. cu termistoare si o instalatie adecvata nmlkj
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100.Cu ce se masoara la distanta turatia motorului principal?
101.Care sunt protectiile la o instalatie de avertizare incendiu?
102.Care sunt tipurile de semnalizare la o instalatie de avertizare incendiu in cazul aparitiei unui incendiu detectat?
103.Ce tipuri de avertizare se folosesc la o instalatie de avertizare incendiu?
1. limitatori electrici, limitatori mecanici, limitatori de corp; nmlkj2. limitatori electrici, limitatori hidroelectrici, limitatori de corp; nmlkj3. limitatori pe pana carmei, limitatori hidropneumatici, limitatori mecanici; nmlkj4. limitatori pe pompa, limitatori mecanici, limitatori pe pana carmei. nmlkj
1. cu un tahogenerator si o instalatie adecvata; nmlkj2. cu un tahoreleu si o instalatie adecvata; nmlkj3. cu un selsin in regim de transformator; nmlkj4. cu un tahoselsin si o instalatie adecvata nmlkj
1. protectie la:linie intrerupta, linie in gol; nmlkj2. protectie la: linie intrerupta, linie in scurtcircuit, linie la masa, lipsa
tensiune de alimentare: nmlkj
3. protectie la: avertizor blocat, linie la masa; nmlkj4. a+c. nmlkj
1. semnalizare optica si acustica; nmlkj2. semnalizare in timonerie si in postul central de comanda; nmlkj3. semnalizare optica si intermitenta; nmlkj4. b+c. nmlkj
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104.Clasificarea sistemelor automate dupa structura lor
105.Clasificarea sistemelor automate dupa cantitatea de informatie apriori disponibila :
106.Clasificarea sistemelor automate dupa numarul de variabile de intrare si de iesire :
107.Clasificarea sistemelor automate dupa natura semnalelor prelucrate de sistemul automat :
1. avertizoare termice si de fum; nmlkj2. avertizoare cu pastila termica si cu bimetale; nmlkj3. avertizoare ionice si termobimetalice; nmlkj4. avertizoare cu iradiatii si electrostatice. nmlkj
1. sisteme automat conventionale; sisteme adaptive; nmlkj2. sisteme deschise; sisteme inchise; nmlkj3. sisteme monovariabile; sisteme multivariabile nmlkj4. sisteme automate continue; sisteme numerice; nmlkj
1. sisteme automat conventionale; sisteme adaptive; nmlkj2. sisteme deschise; sisteme inchise; nmlkj3. sisteme monovariabile; sisteme multivariabile nmlkj4. sisteme automate continue; sisteme numerice; nmlkj
1. sisteme automat conventionale; sisteme adaptive; nmlkj2. sisteme deschise; sisteme inchise; nmlkj3. sisteme monovariabile; sisteme multivariabile nmlkj4. sisteme automate continue; sisteme numerice; nmlkj
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108.Teoria sistemelor automate se ocupa cu :
109.Functia de transfer pentru un element proportional
110.Functia de transfer pentru un element de ordinul I
1. sisteme automat conventionale; sisteme adaptive; nmlkj2. sisteme deschise; sisteme inchise; nmlkj3. sisteme monovariabile; sisteme multivariabile nmlkj4. sisteme automate continue; sisteme numerice; nmlkj
1. analiza functionala a sistemelor automate nmlkj2. corectia functionala si structurale a sistemelor automate nmlkj3. sinteza proiectarii sistemelor automate nmlkj4. a,b si c nmlkj
1.
sTKsH+
=1
)(
nmlkj
2.
ωωωξ 22
2
2)(
+⋅⋅⋅+
⋅=
s
KsHs
nmlkj
3.
KsH =)(
nmlkj
4. nici-o varianta nmlkj
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111.Functia de transfer pentru un element de ordinul II
112.Functia de transfer pentru un element de ordinul III
1.
sTKsH+
=1
)(
nmlkj
2.
ωωωξ 22
2
2)(
+⋅⋅⋅+
⋅=
s
KsHs
nmlkj
3.
KsH =)(
nmlkj
4. nici-o varianta nmlkj
1.
sTKsH+
=1
)(
nmlkj
2.
ωωωξ 22
2
2)(
+⋅⋅⋅+
⋅=
s
KsHs
nmlkj
3.
KsH =)(
nmlkj
4. nici-o varianta nmlkj
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113.Timpul de raspuns al unui sistem este :
114.Figura alaturata prezinta o jonctiune "p-n" la echilibru termic. Din
1.
sTKsH+
=1
)(
nmlkj
2. Maximizeaza
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nmlkj
3.
KsH =)(
nmlkj
4. nici-o varianta nmlkj
1. timpul dintre momentul pornirii procesului pana cand marimea de iesire prezinta un maxim in evolutia ei
nmlkj
2. timpul dintre momentul pornirii procesului pana cand marimea de iesire prezinta un minim in evolutia ei
nmlkj
3. timpul dupa care valoarea absoluta a diferentei dintre marimea de iesire si valoarea ei de regim stationar devine mai mica si se mentine sub o anumita limita
nmlkj
4. timpul dintre momentul pornirii procesului pana cand acesta ia sfarsit nmlkj
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punct de vedere electric, regiunea 1 (marcata):
115.Figura alaturata prezinta o jonctiune "p-n" la echilibru termic. Din punct de vedere electric, regiunea 4 (marcata):
116.Figura alaturata prezinta o jonctiune "p-n". Procesul de difuzie al purtatorilor mobili are loc:
Joncţiune metalurgică
Regiune p Regiune n
Regiune de tranziţie
1 2 3 4
1. este incarcata pozitiv; nmlkj2. este incarcata negativ; nmlkj3. nu este incarcata electric; nmlkj4. este uneori incarcata pozitiv alteori negativ. nmlkj
Joncţiune metalurgică
Regiune p Regiune n
Regiune de tranziţie
1 2 3 4
1. este incarcata pozitiv; nmlkj2. este incarcata negativ; nmlkj3. nu este incarcata electric; nmlkj4. este uneori incarcata pozitiv alteori negativ. nmlkj
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117.Figura alaturata prezinta o jonctiune "p-n" la echilibru termic. Regiunea de tranzitie apare:
Maximizeaza
118.Figura alaturata prezinta o jonctiune "p-n" la echilibru termic. Fenomenul de difuzie care sta la baza explicarii efectului de dioda
p n - - - - - - - - - - - - - - - - - - - -
+ + + + + + + + + + + + + + + + + + + + + + + + +
E
Regiune neutra p
Regiune neutră n
Regiune de tranziţie
1. la nivelul regiunii neutre p; nmlkj2. la nivelul regiunii neutre n; nmlkj3. la nivelul regiunii de tranzitie; nmlkj4. in toata structura. nmlkj
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1. datorita campului electric intern; nmlkj2. datorita barierei de potential; nmlkj3. datorita procesului de difuzie al purtatorilor mobili; nmlkj4. datorita procesului de difuzie al purtatorilor ficsi. nmlkj
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inceteaza atunci cand:
119.Caracteristica statica a unei diode semiconductoare este prezentata in figura alaturata. Regiunea AB reprezinta:
Maximizeaza
p n - - - - - - - - - - - - - - - - - - - -
+ + + + + + + + + + + + + + + + + + + + + + + + +
E
Regiune neutra p
Regiune neutră n
Regiune de tranziţie
1. concentratia de goluri din regiunea "p" echilibreaza concentratia de electroni din regiunea "n";
nmlkj
2. fortele electrice echilibreaza fortele de difuzie; nmlkj3. concentratia de goluri din regiunea "n" echilibreaza concentratia de
electroni din regiunea "p"; nmlkj
4. concentratia de goluri echilibreaza concentratia de electroni. nmlkj
C D
E
uA
iA
IS Uγ
A
B
1. regiunea de blocare la polarizare inversa; nmlkj2. regiunea de blocare la polarizare directa; nmlkj3. regiunea de conductie; nmlkj
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120.Caracteristica statica a unei diode semiconductoare este prezentata in figura alaturata. Regiunea BC reprezinta:
Maximizeaza
121.Caracteristica statica a unei diode semiconductoare este prezentata in figura alaturata. Regiunea CD reprezinta:
Maximizeaza
4. regiunea de strapungere. nmlkj
C D
E
uA
iA
IS Uγ
A
B
1. regiunea de blocare la polarizare inversa; nmlkj2. regiunea de blocare la polarizare directa; nmlkj3. regiunea de conductie; nmlkj4. regiunea de strapungere. nmlkj
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122.Caractetristica statica a unei diode semiconductoare este prezentata in figura alaturata. Regiunea DE reprezinta:
Maximizeaza
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1. regiunea de blocare la polarizare inversa; nmlkj2. regiunea de blocare la polarizare directa; nmlkj3. regiunea de conductie; nmlkj4. regiunea de strapungere. nmlkj
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1. regiunea de blocare la polarizare inversa; nmlkj2. regiunea de blocare la polarizare directa; nmlkj
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123.Figura alaturata prezinta una din posibilitatile de liniarizare pe portiuni a caracteristicii statice. Conform acestei aproximari dioda se comporta ca:
124.Multiplicarea in avalansa are loc:
125.Efectul "tunel" are loc:
3. regiunea de conductie; nmlkj4. regiunea de strapungere. nmlkj
vA
iA
Model de ordin zero Caracteristica rea
1. sursa de curent; nmlkj2. un scurtcircuit; nmlkj3. un comutator; nmlkj4. o sursa de tensiune. nmlkj
1. la tensiuni mari si este specifica jonctiunilor slab dopate; nmlkj2. la tensiuni mici si este specifica jonctiunilor slab dopate; nmlkj3. la tensiuni mari si este specifica jonctiunilor puternic dopate; nmlkj4. la tensiuni mici si este specifica jonctiunilor puternic dopate. nmlkj
1. la tensiuni mici si este specific jonctiunilor puternic dopate; nmlkj2. la tensiuni mari si este specific jonctiunilor puternic dopate; nmlkj
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126.Figura alaturata prezinta simbolul unei:
127.Figura alaturata prezinta structura unei diode "p-n". Cu "n" s-a notat:
Maximizeaza
3. la tensiuni mici si este specific jonctiunilor slab dopate; nmlkj4. la tensiuni mari si este specific jonctiunilor slab dopate. nmlkj
A C
1. diode redresoare; nmlkj2. diode stabilizatoare; nmlkj3. diode varicap; nmlkj4. tiristor. nmlkj
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1. concentratia de goluri; nmlkj2. concentratia de electroni: nmlkj3. concentratia de atomi donori; nmlkj4. concentratia de atomi acceptori. nmlkj
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128.Figura alaturata prezinta structura unei diode "p-n". Cu "p" s-a notat:
129.Figura alaturata prezinta structura unei diode "p-n". Cu "Na" s-a notat:
130.Figura alaturata prezinta structura unei diode "p-n". Cu "ND" s-a notat:
ANp ≅
A
DNn ≅
C
Jonţiune metalurgică
1. concentratia de goluri; nmlkj2. cocentratia de electroni; nmlkj3. concentratia de atomi donori; nmlkj4. concentratia de atomi acceptori. nmlkj
ANp ≅
A
DNn ≅
C
Jonţiune metalurgică
1. concentratia de goluri; nmlkj2. concentratia de electroni; nmlkj3. concentratia de atomi donori; nmlkj4. concentratia de atomi acceptori. nmlkj
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131.In functionare normala (considerand curentul rezidual neglijabil) curentul prin dioda redresoare circula:
132.Figura alaturata prezinta simbolul:
Maximizeaza
ANp ≅
A
DNn ≅
C
Jonţiune metalurgică
1. concentratia de goluri; nmlkj2. concentratia de electroni; nmlkj3. concentratia de atomi donori; nmlkj4. concentratia de atomi acceptori. nmlkj
1. numai de la anod spre catod; nmlkj2. numai de la catod spre anod; nmlkj3. uneori de la anod spre catod si alteori de la catod spre anod; nmlkj4. functie de aplicatie. nmlkj
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133.Prin sintagma "efect de dioda" se intelege:
134.Figura alaturata prezinta o jonctiune "p-n" la echilibru termic. Din punct de vedere electric, regiunea 2 (marcata) aflata in stanga jonctiunii metalurgice:
135.Figura alaturata prezinta o jonctiune "p-n" la echilibru termic. Din punct de vedere electric, regiunea 3 (marcata) aflata in stanga jonctiunii metalurgice:
1. unei diode Zener; nmlkj2. unei diode redresoare; nmlkj3. unei diode varicap; nmlkj4. unui tiristor. nmlkj
1. aparitia regiunii de sarcina spatiala intr-o jonctiune "p-n"; nmlkj2. conductia unilaterala (curentul circula numai de la anod spre catod); nmlkj3. dependenta exponentiala a curentului de tensiune la conductie; nmlkj4. dependenta rezistentei de semnal mic de punctul static de functionare. nmlkj
Joncţiune metalurgică
Regiune p Regiune n
Regiune de tranziţie
1 2 3 4
1. este incarcata pozitiv; nmlkj2. este incarcata negativ; nmlkj3. nu este incarcata electric; nmlkj4. este uneori incarcata pozitiv alteori negativ. nmlkj
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136.Daca anodul unei diode este mai pozitiv decat catodul despre o dioda se spune ca este:
137.La polarizare directa bariera interna de potential este:
138.La polarizare inversa bariera interna de potential este:
Joncţiune metalurgică
Regiune p Regiune n
Regiune de tranziţie
1 2 3 4
1. este incarcata pozitiv; nmlkj2. este incarcata negativ; nmlkj3. nu este incarcata electric; nmlkj4. este uneori incarcata pozitiv alteori negativ. nmlkj
1. polarizata direct; nmlkj2. polarizata invers; nmlkj3. prepolarizata; nmlkj4. nepolarizata. nmlkj
1. crescuta; nmlkj2. coborata; nmlkj3. neafectata; nmlkj4. anulata. nmlkj
1. crescuta; nmlkj2. coborata; nmlkj
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139.La polarizare directa campul electric intern este:
140.La polarizare inversa campul electric intern este:
141.Ecuatia caracteristica statica pentru dioda ideala este cea din formula. Marimea "iA" reprezinta:
142.Ecuatia caracteristica statica pentru dioda ideala este cea din formula. Marimea "uA" reprezinta:
3. neafectata; nmlkj4. anulata. nmlkj
1. crescut; nmlkj2. coborat; nmlkj3. neafectat; nmlkj4. anulat. nmlkj
1. crescut; nmlkj2. coborat; nmlkj3. neafectat; nmlkj4. anulat. nmlkj
−
= 1exp
T
ASA V
uIi
1. valoarea instantanee de semnal mic a curentului prin dioda; nmlkj2. valoarea instantanee totala a curentului prin dioda; nmlkj3. valoarea continua a curentului prin dioda; nmlkj4. valoarea efectiva a curentului prin dioda. nmlkj
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143.Ecuatia caracteristica statica pentru dioda ideala este cea din formula. Marimea "VT" poarta numele de tensiune termica. La temperatura ambianta ea are valoarea aproximativa:
144.Relatia intre curent si tensiune (caracteristica statica) in cazul unei diode semiconductoare cu germaniu sau cu siliciu care conduce urmeaza:
145.Consideram o dioda cu germaniu si o dioda cu siliciu avand aceleasi limite de curent. Comparand cele doua diode in ceea ce priveste caderea
−
= 1exp
T
ASA V
uIi
1. valoarea instantanee de semnal mic a caderii de tensiune pe dioda; nmlkj2. valoarea instantanee totala a caderii de tensiune pe dioda; nmlkj3. valoarea continua a caderii de tensiune pe dioda; nmlkj4. valoarea efectiva a caderii de tensiune pe dioda. nmlkj
−
= 1exp
T
ASA V
uIi
1. 2.5 mV; nmlkj2. 25 mV; nmlkj3. 250 mV; nmlkj4. 2.5 V. nmlkj
1. o lege liniara; nmlkj2. o lege patratica; nmlkj3. o lege parabolica de exponent 3/2; nmlkj4. o lege exponentiala. nmlkj
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de tensiune corespunzatoare unui anumit curent in regim de conductie directa si curentul rezidual in regim de conductie inversa, se poate face urmatoarea afirmatie:
146.Diodele stabilizatoare lucreaza in regim de:
147.Pentru o dioda semiconductoare redresoare parametrii electrici de interes sunt:
148.Pentru o dioda semiconductoare stabilizatoare parametrii electrici de interes sunt:
1. caderea de tensiune in conductie directa si curentul invers sunt mai mici la dioda cu siliciu;
nmlkj
2. caderea de tensiune in conductie directa este mai mica iar curentul invers este mai mare la dioda cu siliciu;
nmlkj
3. caderea de tensiune in conductie directa si curentul invers sunt mai mari la dioda cu siliciu;
nmlkj
4. caderea de tensiune in conductie directa este mai mare iar curentul invers este mai mic la dioda cu siliciu.
nmlkj
1. conductie; nmlkj2. blocare la polarizare directa; nmlkj3. blocare la polarizare inversa; nmlkj4. strapungere. nmlkj
1. IFM (curentul direct maxim admisibil) si VZ (tensiunea nominala de stabilizare);
nmlkj
2. VBR (tensiunea de strapungere) si IFM (curentul direct maxim admisibil); nmlkj3. IZM (curentul maxim admisibil prin dioda la polarizare inversa) si VZ
(tensiunea nominala de stabilizare); nmlkj
4. Vz (tensiunea nominala de stabilizare) si IFM (curentul direct maxim admisibil).
nmlkj
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149.Pentru a indeplini conditia de semnal mic cu semnalul pe dioda trebuie sa fie mai mic de:
150.Conductanta de semnal mic a diodei are valoarea:
1. IFM (curentul direct maxim admisibil) si Vz (tensiunea nominala de stabilizare);
nmlkj
2. VBR (tensiunea de strapungere) si IFM (curentul direct maxim admisibil); nmlkj3. IZM (curentul maxim admisibil prin dioda la polarizare inversa) si VZ
(tensiunea nominala de stabilizare); nmlkj
4. Vz (tensiunea nominala de stabilizare) si IFM (curentul direct maxim admisibil).
nmlkj
1. 1 mV; nmlkj2. 10 mV; nmlkj3. 25 mV; nmlkj4. 100 mV. nmlkj
1.
[ ] [ ]mAImSg Aa 20=
nmlkj
2.
[ ] [ ]mAImSg Aa 40=
nmlkj
3.
[ ] [ ]mAImSg Aa 25=
nmlkj
4.
[ ] [ ]mAImSg Aa 100=
nmlkj
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151.Schema echivalenta a unei diode semiconductoare ce lucreaza in conditii de semnal mic, regim cvasistatic este:
152.Schema echivalenta a unei diode semiconductoare ce lucreaza in conditii de semnal mic, regim cvasistatic este:
1.
aaa vgi =
nmlkj
2.
aaa vri =
nmlkj
3.
dtdv
Cvgi aaaa +=
nmlkj
4.
dtdv
Ci aa =
nmlkj
1.
C A
nmlkj
2. Maximizeaza
nmlkj
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153.
Maximizeaza
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3.
C A
nmlkj
4.
C A
nmlkj
Să se determine rezistenţa echivalentă faţă de bornele A şi B a reţelei pasivizate din figura 46 cu: R2=15Ω, R3=R4=6Ω, R5=R6=R7=4Ω.
Ω= 5R1
1. R=7,5ohm nmlkj
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154.Sa se determine rezistenta echivalenta fata de bornele A si B a retelei pasive din figura 47 cu: R1=R2=R3=9ohm; R4=6ohm; R5=6ohm; R6=R7=12ohm; R8=R9=10ohm
Maximizeaza
2. R=10ohm nmlkj3. R=4,5ohm nmlkj4. R=3,5ohm nmlkj
Să se determine rezistenţa echivalentă faţă de bornele A şi B a reţelei pasive din fig.47 cu: R1=R2=R3=9Ω, R4=6Ω,R5=6Ω, R6=R7=12Ω, R8 =R9=10.
1.
RAB= Ω
1213
nmlkj
2. Maximizeaza
nmlkj
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155.O placa de metal necesita pentru a fi nichelata, 6g de nichel. Baia de nichelare permite un curent de 10A. Sa se calculeze timpul necesar pentru operatia de nichelare.
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3. Maximizeaza
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nmlkj
4.
RAB=6Ω.
nmlkj
1. t=980s nmlkj
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156.O baterie de 4,5 V are o capacitate de 0,6 Ah. Cate ore poate alimenta aceasta baterie un bec de 1,5 W?
157.Factorul de putere se defineste ca:
158.Campul electric uniform este:
2. t=460s nmlkj3. t=400s nmlkj4. t=1020s nmlkj
1. t = 2h; nmlkj2. t = 20h; nmlkj3. t = 1,8h; nmlkj4. t = 14h. nmlkj
1.
;S
Pcos =ϕ
nmlkj
2.
;QPcos 22 +=ϕ
nmlkj
3.
;S
Qcos =ϕ
nmlkj
4.
S
Pcos =ϕ
nmlkj
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159.
160.
161.
1. campul care are in toate punctele aceiasi intensitate electrica si liniile de camp paralele;
nmlkj
2. campul determinat de sarcini punctiforme; nmlkj3. campul determinat de sarcini uniform distribuite; nmlkj4. campul electric determinat de sarcini punctiforme si uniform distribuite. nmlkj
Relaţia : reprezintă:
PED 0 +⋅ε=
1. definitia inductiei electrice D; nmlkj2. legea legaturii dintre D, E si P; nmlkj3. legea polarizatiei electrice; nmlkj4. expresia superpozitiei elementelor ce definesc campul electric. nmlkj
reprezintã:
1212
32l
02112 R
Rqq
41FF ⋅⋅πε
=−=
1. legea fluxului electric; nmlkj2. forta electrica; nmlkj3. forta exercitata de campul electric asupra corpurilor din interiorul lui; nmlkj4. teorema lui Coulomb. nmlkj
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162.
Maximizeaza
163.Supratata echipotentiala este:
este:
( ) ( )rVrVdrEUr
r0
o
−=⋅= ∫
1. tensiunea electrica intre doua puncte; nmlkj2. teorema potentialului electrostatic; nmlkj3. teorema lui Gauss; nmlkj4. teorema superpozitiei campurilor coulombiene. nmlkj
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1. legea fluxului electric; nmlkj2. definitia fluxului electric; nmlkj3. teorema potentialului electrostatic; nmlkj4. forta exercitata de campul electric asupra corpurilor din interiorul lui. nmlkj
1. suma potentialelor punctelor din campul electric; nmlkj
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164.Armaturile unui condensator intre care se aplica diferenta de potential se incarca cu:
165.Ce este un condensator plan?
166.Un condensator plan are armaturi circulare cu raza R 9 cm, distanta dintre armaturi d = 0,5mm, dielectric sticla cu e = 7. Intre armaturi se aplica o tensiune U = 400 V. Se cer capacitatea condensatorului, intensitatea campului in dielectric si sarcina electrica a armaturilor:
2. orice suprafata ce trece prin trei puncte necoliniare din campul electric; nmlkj3. totalitatea punctelor cu acelasi potential; nmlkj4. suprafata determinata de intersectia traiectoriilor a doua sarcini electrice ce
se deplaseaza sub actiunea fortelor electrice. nmlkj
1. potentiale ridicate; nmlkj2. camp electric neomogen; nmlkj3. sarcini electrice negative libere; nmlkj4. sarcini electrice egale si de semn contrar. nmlkj
1. un ansamblu de armaturi plane, paralele, de diferite forme cu un mediu dielectric intre ele;
nmlkj
2. un ansamblu de doua suprafete echipotentiale; nmlkj3. un ansamblu de doua corpuri izolatoare; nmlkj4. un ansamblu de doua ecrane electrice. nmlkj
1.
;C2,0Q;cm/kV5,1E;F1012C 10 µ==⋅= −
nmlkj
2. nmlkj
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167.Formula capacitatii condensatorului plan este :
;C26,1Q;cm/kV8E;F105,31C 10 µ==⋅= −
3.
;C8Q;cm/kV2,2E;F1010C 10 µ=⋅= −
nmlkj
4.
;C3Q;kV12E;F108C 10 µ==⋅= −
nmlkj
1.
;d/S4C πε=
nmlkj
2. Maximizeaza
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nmlkj
3.
;SdC ε=
nmlkj
4. nmlkj
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168.Capacitatea echivalenta a n condensatoare de capacitati C1,C2,C3….Cn conectata in paralel este :
169.Capacitatea echivalenta a n condensatoare de capacitati C1,C2,…Cn conectate in serie este :
;d/SC ε=
1.
Cp= C1 + C2 +…+Cn ;
nmlkj
2.
1/Cp=1/C1+1/C2 +…+1/Cn ;
nmlkj
3.
Cp= 1/C1+1/C2+ …+1/Cn ;
nmlkj
4.
1/Cp= C1 +C2+…+Cn ;
nmlkj
1. Maximizeaza
nmlkj
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170.
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2.
Cs=1/C1+1/C2+…1/Cn ;
nmlkj
3. Maximizeaza
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nmlkj
4.
Cs=C1+C2+…+Cn ;
nmlkj
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171.
Energia câmpului electrostatic a unui sistem de n conductoare omogene cu qk Vk , aflate într-un mediu dielectric liniar are expresia :
1.
W= ½ ΣqkVk ;
nmlkj
2.
ΣqkVk ;
nmlkj
3.
W=W1+W2+…+Wn ;
nmlkj
4.
W=1/ε ΣqkVk ;
nmlkj
In reteaua de condensatoare din figura C1=20 µF, C2=5µF, C3= 1µF, C4=3µF. Capacitatea echivalentă a sistemului este :
1.
Ce=C1+C2+ C3C4/(C3+C4)
nmlkj
2.
1/C e=1/C1+1/C2+1/(C3+C4)
nmlkj
3. nmlkj
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172.
Maximizeaza
1/Ce=1/C1+1/C2+C3C4/(C3+C4)
4.
1/Ce=C1+C2+1/(C3+C4)
nmlkj
Un conductor cu diametru d, aflat la distanţa h deasupra pamântului , are o lungime l şi este încărcat cu densitatea de sarcină ρl. Determinaţi expresia potenţialului într-un punct M produs de conductorul real si de imaginea sa(figura 66):
1. ;rln
2
qV
0
e11 πε=
nmlkj
2. ;
r
1
r
1ln
2
q
r
1ln
2
q
r
1ln
2
qV
210
e
20
e
10
e11 ⋅
πε=
πε+
πε=
nmlkj
3. ;
r
rln
2
q
r
1ln
2
q
r
1ln
2
qV
1
2
0
e
20
e
10
e11 πε
=πε
−πε
=
nmlkj
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173.
4.
( );rrln2
qV 21
0
e11 +
πε=
nmlkj
Se consideră reţeaua de condensatoare din figura 67 Determinaţi capacitatea echivalentă a sistemului
1. ;
CC
CCC
1
C
1C
43
432
1
e
++
+=
nmlkj
2. ;CCCCC 4321e +++=
nmlkj
3. ;
CC
CC
C
1
C
1
C
1
43
43
21e +++=
nmlkj
4. ;
CC
CCCC
C
1
43
4321
e +++=
nmlkj
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174.Un condensator plan are armaturile in forma de patrat cu latura a, aflate la distanta d una fata de cealalta. Intre armaturi se introduce un bloc dielectric format de 2 straturi de grosimi d si d2 = d-d1, de permitivitati e1 si e2. Considerand blocul in pozitia intermediara x si armaturile conectate la sursa Uo, campul electric in dielectric si aer este:
175.Se considera doi cilindrii coaxiali de raze r1 si r1, de inaltime h, pusi sub diferenta de potential V1-V2. Intre cei doi cilindrii se afla un mediu dielectric de permitivitate e. Determinati variatia intensitatii campului electric intre cei doi cilindrii coaxiali:
1. ;
dd
UE;
dd
UE;
dd
UE
21
0a
1221
102
121
201 +
=ε+εε
=ε+εε
=ε
nmlkj
2. ;
dd
UE;
dd
UE;
dd
UE
21
0a
1221
202
1221
1o1 +
=ε+εε
=ε+εε
=
nmlkj
3.
( );dd/UE;d
UE;
d
UE 210a
2
022
1
011 +=
ε=
ε=
nmlkj
4. ;E
dd
UEE a
21
021 =
+==
nmlkj
1. nmlkj
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176.Se considera un condensator plan in vid incarcat si izolat intre armaturile caruia se introduce o placa metalica de grosimea d1, cu celalalte dimensiuni egale cu cele ale armaturilor. Determinati capacitatea echivalenta a ansamblului astfel format in situatia in care placa se introduce pana la jumatatea lungimii armaturii si la mijlocul distantei dintre acestea.
;r
1
r
rln
VE
2
1
1 ⋅=
2.
;r
1
r
rln
VVE
1
2
21 ⋅−
=
nmlkj
3.
r
1
r
rln
VE
2
1
2 ⋅=
nmlkj
4. ;r
1
r
rln
VVE
2
1
21 ⋅+
=
nmlkj
1. Maximizeaza
nmlkj
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177.Expresia intensitatii campului electric determinat de un conductor de lungime infinita si incarcat cu o sarcina uniform distribuita r1 intr-un punct M aflat la distanta a de conductor este:
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2. ;
CCCCCC
CCC
C
1
323121
321
e ++=
nmlkj
3. ;CCCC 321e ++=
nmlkj
4. ;
C
1
C
1
C
1
C
1
321e
++=
nmlkj
1. ;
a4
qE
0
e
πε=
nmlkj
2. nmlkj
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178.Expresia intensitatii campului electric determinat de un plan de dimensiuni infinite, uniform incarcat cu o sarcina electrica de densitate rA, intr-un punct M aflat la distanta a de plan este:
179.Expresia capacitatii condensatorului sferic este :
;aq2E 0e πε⋅=
3.
;a2
qE
0
e
πε=
nmlkj
4. ;sin
2
qE
0
e απε
=
nmlkj
1. ;q2E A0ε=
nmlkj
2. ;
a2
qE
0
A
πε=
nmlkj
3. ;
a2
qE A=
nmlkj
4.
;2
qE
0
A
ε=
nmlkj
Page 66 of 122
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180.Teorema fortelor generalizate in campul electrostatic este :
1.
;RR
RR4C
12
21
−⋅πε=
nmlkj
2.
;RR2C 21⋅πε=
nmlkj
3. ;
RR
RR2C
21
21
+⋅πε=
nmlkj
4. ;
RR
RR2
1C
21
21
+⋅πε
=
nmlkj
1.
;ctVx
WX;ctP
x
WX
K
K
K
K =
∂∂
==
∂∂
−=
nmlkj
2.
;ctVx
WX;ctP
x
WX
K
K
K
K =
∂∂
−==
∂∂
=
nmlkj
3.
;ctPx
WX;ctE
x
WX
K
K
K
K =
∂∂
==
∂∂
=
nmlkj
4. nmlkj
Page 67 of 122
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181.Legea conservarii sarcinii electrice se exprima:
182.Rezistenta electrica a unui conductor omogen si de sectiune constanta este:
1. intensitatea curentului electric de conductie care iese dintr-o suprafata S este egala cu viteza de scadere a sarcinii electrice adevarate continute in interiorul suprafetei;
nmlkj
2. intensitatea curentului electric de conductie care iese dintr-o suprafata S este egala cu sarcina din suprafata respectiva;
nmlkj
3. intensitatea curentului electric de conductie care iese dintr-o suprafata S este egala cu raportul dintre tensiune si rezistenta;
nmlkj
4. intensitatea curentului electric de conductie care iese dintr-o suprafata S este dependenta de natura mediului electric.
nmlkj
1. ;lSR ρ=
nmlkj
2. ;
S
lR ρ=
nmlkj
3. Maximizeaza
nmlkj
Page 68 of 122
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183.Marimea inversa rezistentei este:
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4. ;
S
l1R ⋅
ρ=
nmlkj
1. Maximizeaza
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nmlkj
2. conductanta G; nmlkj3. reluctanta L ; nmlkj
Page 69 of 122
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184.Caldura dezvoltata intr-un conductor de rezistenta R in timpul t este:
185.Pentru n rezistoare montate in serie rezistenta echivalenta este:
4. inductivitatea L. nmlkj
1.
Q= Rti2
nmlkj
2. Maximizeaza
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nmlkj
3.
Q=Rt/i2;
nmlkj
4.
Q=ti2/R;
nmlkj
1. nmlkj
Page 70 of 122
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186.Pentru n rezistoare montate in paralel rezistenta echivalenta se determina:
;RR
KKe ∑=
2.
;R
1R
K K
e ∑=
nmlkj
3. ;
R
1
R
1
K Ke
∑=
nmlkj
4. ;
R...RR
R...RRR
n21
n21e +++
⋅=
nmlkj
1. Maximizeaza
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nmlkj
2. nmlkj
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187.Metoda curentilor de ochiuri de rezolvare a circuitelor electrice implica calculul unor rezistente de ochiuri Rpp:
188.Metoda potentialelor la noduri de rezolvare a circuitelor electrice implica calculul unor conductante Gpp astfel:
189.Teorema conservarii puterilor se scrie:
;RR
KKe ∑=
3. ;
R
1R
K K
e ∑=
nmlkj
4.
;R
1
R
1
K Ke
∑=
nmlkj
1. suma pozitiva a rezistentelor din ochiul p; nmlkj2. suma algebrica a rezistentelor din ochiul p; nmlkj3. suma negativa a rezistentelor din ochiul p; nmlkj4. suma rezistentelor din laturile comune cu alte ochiuri. nmlkj
1. suma pozitiva a conductantelor laturilor care au un capat in nodul p; nmlkj2. suma negativa a conductantelor laturilor care au un capat in nodul p; nmlkj3. suma negativa a conductantelor laturilor care au un capat in nodul p; nmlkj4. suma conductantelor laturilor comune cu alte noduri. nmlkj
1. nmlkj
Page 72 of 122
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190.N surse de tensiune electromotoare E de rezistente interne r, montate in serie pot fi inlocuite cu o sursa echivalenta Ee de rezistenta re:
;PIEIR bK
KK
2K
KK −= ∑∑
2.
;PIEIR bKK
K2K
KK += ∑∑
nmlkj
3. Maximizeaza
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nmlkj
4. ;0PIEIR bK
KK
2K
KK =++∑∑
nmlkj
1. Maximizeaza
nmlkj
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2. Maximizeaza
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nmlkj
3.
;rrEEK
KeK
Ke ∑∑ ==
nmlkj
4. Maximizeaza
nmlkj
Page 74 of 122
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191.N surse de tensiuni electromotoare E de rezistente r interne, montate in paralel pot fi inlocuite cu o sursa echivalenta Ee si de rezistenta re:
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1. Maximizeaza
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nmlkj
2. ;rmrmEE ee ⋅==
nmlkj
3. nmlkj
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192.Pentru circuitul din figura 85, rezistenta echivalenta intre nodurile A si B este:
Maximizeaza
;
m
rrmEE ee ==
4. ;rmrEE ee ⋅==
nmlkj
1. ;rRRR
RR
RRR 143
65
65AB ++++
+−
=
nmlkj
2.
( );
rRRRRR
RR
rRRRRR
RR
R
143
65
65
143
65
65
AB
+++++
+
++
+=
nmlkj
3. nmlkj
Page 76 of 122
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193.Rezistenta echivalenta fata de bornele AB, din circuitul din figura 86, este:
Maximizeaza
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4. ;rR
RR
RR
RR
RRR 1
43
43
65
65AB ++
++
+
nmlkj
1. nmlkj
Page 77 of 122
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194.
( )( )
( ) ( ) ( )( );RRRRRRRRRR
RRRRRR
4132415325
41325AB ++++++
++=
2. Maximizeaza
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nmlkj
3. ;
R
RRRR
R
RRRR
R
5
41
41
5
32
32AB +
⋅+
=
nmlkj
4. ;RR
RRRRRR
RRRR 32
544151
451AB ++
++=
nmlkj
Fluxul magnetic Φ este exprimat prin relaţia:
1. nmlkj
Page 78 of 122
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195.
196.Teorema lui Ampere se enunta astfel: Tensiunea magnetica in lungul firului unei curbe inchise C cu elementul de curba dl, este egala cu:
;AdB∫∫ ⋅=Φ
2.
∫∫ ⋅=ΦS
;SdE
nmlkj
3. ;SdH
S⋅=Φ ∫∫
nmlkj
4. ;SdB
S∫∫ ⋅=Φ
nmlkj
In legea reprezintă:
( ) mm H1B χχ+µ=
1. permitivitate electrica; nmlkj2. permeabilitatea magnetica; nmlkj3. susceptivitatea magnetica; nmlkj4. inductanta. nmlkj
1. solentia care inlantuie acea curba; nmlkj2. fluxul magnetic din suprafata S ce se sprijina pe curba C; nmlkj3. inductia magnetica multiplicata cu reductanta; nmlkj4. intensitatea campului magnetic in lungul curbei. nmlkj
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197.Energia magnetica a unui sistem de conductoare parcurse de curenti, situat intr-un mediu liniar si fara magnetizatie permanenta este:
198.A doua teorema a lui Kirchhoff pentru circuitele magentice este:
1. Maximizeaza
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nmlkj
2.
kK
Km iW Φ⋅= ∑
nmlkj
3. ;Bi
2
1W K
KKm ⋅= ∑
nmlkj
4.
kK
Km i2
1W Φ⋅= ∑
nmlkj
1. nmlkj
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199.Prima teorema a lui Kirchhoff pentru circuite magnetice este:
;iR K
qKmk
qKK ⋅=θ ∑∑
∈∈
2. ;iR K
qKmk
qKK ⋅=θ ∑∑
∈∈
nmlkj
3. Maximizeaza
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nmlkj
4. ;iL K
qKmk
qKK ⋅=θ ∑∑
∈∈
nmlkj
1.
;0K
K =φ∑
nmlkj
2. nmlkj
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200.Pulsatia de rezonanta este:
;0i
KK =∑
3. ;0H
KK =∑
nmlkj
4. ;0B
KK =∑
nmlkj
1.
;LC=ω
nmlkj
2. Maximizeaza
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nmlkj
3. nmlkj
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201.Puterea instantanee este definita astfel:
;C
L=ω
4. Maximizeaza
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nmlkj
1.
;uiP =
nmlkj
2. Maximizeaza
nmlkj
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202.Puterea aparenta complexa este:
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3. Maximizeaza
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nmlkj
4. ;RiP 2=
nmlkj
1. ;cosUIS ϕ=
nmlkj
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203.Legea legaturii dintre D, E si P se exprima prin relatia:
204.Energia inmagazinata intre armaturile unui condensator se exprima prin relatia:
2. ;PbRIS 2 +=
nmlkj
3. ;sinjUIcosUIS ϕ+ϕ=
nmlkj
4. ;sinUIS ϕ=
nmlkj
1.
;PED 0
→→→+ε=
nmlkj
2.
;PD
E0
→→
→+
ε=
nmlkj
3.
);PE(D 0
→→→+ε=
nmlkj
4.
.EPD 0
→→→+ε=
nmlkj
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205.Capacitatea condensatorului cilindric, cu armaturi coaxiale de raze R1 si R2 si lungime l este data de relatia:
1. Maximizeaza
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nmlkj
2.
;CU2
1W 2=
nmlkj
3.
;U.C2
1W 2=
nmlkj
4.
.U.C2
1W =
nmlkj
1.
;RR
R.Rl.4C
12
21
−πε=
nmlkj
Page 86 of 122
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206.Intensitatea campului electric al unei sarcini punctuale este:
2.
;
R
Rln
l2C
1
2
πε
=
nmlkj
3.
;R
Rl2C
1
2πε=
nmlkj
4. Maximizeaza
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nmlkj
1.
;q.FE =
nmlkj
2.
;R
q.4E
2πε=
nmlkj
3. nmlkj
Page 87 of 122
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207.Un condensator plan de capacitate C, este incarcat la o sursa de tensiune U. Decuplandu-se de la sursa, I se mareste distanta intre armaturi de n ori fata de cea initiala. Variatia tensiunii la bornele condensatorului este.
;q
R4E
2
πε=
4. Maximizeaza
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nmlkj
1.
;UU 21 =
nmlkj
2.
;nUU 21 =
nmlkj
3.
;n
UU
21
2 =
nmlkj
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208.Patru condensatoare sunt legate ca in figura 6. Se cunosc capacitatile:elt6.mht. Sarcina condensatorului C3 este elt3.mht. Tensiunea aplicata la bornele M si N este
209.Legea conductiei electrice
4.
12 nUU =
nmlkj
Patru condensatoare sunt legate ca în figura 6. Se cunosc capacităţile:
Sarcina condensatorului C3 este Tensiunea aplicată la bornele M şi N este.
.2;1;4;7 4321 FCFCFCFC µµµµ ====
.10 43 CQ −=
1. U=100V nmlkj2. U=200V nmlkj3. U=250V nmlkj4. U=125V nmlkj
1.
+ ei= R .i;
fU
nmlkj
2.
P=Ri2;
nmlkj
3.
P=Ri2-ei.i;
nmlkj
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210.Legea transformarii energiei electromagnetice prin conductie electrica este:
211.Teorema lui Helmholtz-Thevenim este:
4.
Q=R.i2.t.
nmlkj
1.
P=U2.i;
nmlkj
2.
P=Ri2- ei.i;
nmlkj
3.
P=R2.i.t
nmlkj
4.
P=i2.U.t.
nmlkj
1.
;GG
IU
BOA
BABA +=
nmlkj
2. nmlkj
Page 90 of 122
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212.Legea electrolizei se exprima prin relatia:
;RR
Ui
ABO
ABOAB +
=
3. Maximizeaza
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nmlkj
4.
.GG
Ui
ABO
ABOAB +
=
nmlkj
1.
∫= ;idtA
F.nm
nmlkj
2.
;idtn
A
F
1m ∫⋅=
nmlkj
3. nmlkj
Page 91 of 122
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213.Relatia de transformare din stea in triunghi este:
;tiAm ⋅⋅=
4.
tAiFm ⋅⋅⋅=
nmlkj
1.
;R
RRRRR
3
212121 ++=
nmlkj
2. Maximizeaza
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nmlkj
3.
;RRRR 32121 ++=
nmlkj
4.
.RRR
R.R.RR
321
32121 ++=
nmlkj
Page 92 of 122
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214.Curentul dintr-o ramificatie a divizorului de curent se exprima cu relatia:
215.Curentul de scurtcircuit al unui acumulator este ISC=40A. Legand la bornele acumulatorului o rezistenta R=3ohm, curentul debitat de acumulator are valoarea I=2,5A. Tensiunea electromotoare E a acumulatorului este:
216.Se da reteaua electrica din figura 14, cu: R3=3ohm si sursele de
1.
;R
RRii
1
211
+=
nmlkj
2.
;RR
Rii
21
21 +=
nmlkj
3.
;RR
Rii
21
11 +
⋅=
nmlkj
4.
.R
Rii
1
21 =
nmlkj
1. E=6V nmlkj2. E=14V nmlkj3. E=8V nmlkj4. E=10V nmlkj
Page 93 of 122
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tensiuni electromotoare E1=100V si E2=200V, avand rezistentele interioare r1=r2=0,5ohm. Curentul I1 este:
Maximizeaza
217.Se monteaza in serie 20 de elemente galvanice, avand fiecare tensiunea electromotoare e=2V si rezistenta interioara r=0,5ohm. Se cere sa se stabileasca raportul K intre curentul debitat de aceasta baterie si curentul debitat de un singur element pe rezistenta R in urmatoarele ipoteze: R=2ohm; R=400ohm
218.
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1. I1=10A nmlkj2. I1=14A nmlkj3. I1=2/3A nmlkj4. I1=1000/13A nmlkj
1. K=4,08 nmlkj2. K=2,71 nmlkj3. K=4,16 nmlkj4. K=2,21 nmlkj
Page 94 of 122
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219.
220.Transferul maxim de putere se realizeaza atunci cand:
221.Randamentul instalatiei pe timpul transferului maxim de putere este:
Se dă reţeaua electrică din figura 16 (anexa A) cu:
şi E=60V. Curentul I1 este: Ω=Ω=Ω==Ω== 10;5;8;16 653241 RRRRRR
1. I1=145/17 nmlkj2. I1=130/17 nmlkj3. I1=120/17 nmlkj4. I1=170/13 nmlkj
Rezistenţa echivalentă faţă de bornele A şi B a reţelei pasive din figura 17 cu:
este:
Ω=Ω=== 6,9 4321 RRRR
1. R=12ohmi nmlkj2. R=14ohmi nmlkj3. R=16ohmi nmlkj4. R=20 ohmi nmlkj
1. R=Ri/2 nmlkj2. 2Ri=R nmlkj3. Ri=R nmlkj4. R=3Ri nmlkj
Page 95 of 122
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222.
223.Legea legaturii dintre inductia magnetica, intensitatea magnetica si magnetizatie este:
1. 1 nmlkj2. 1/3 nmlkj3. 1/2 nmlkj4. 0,75 nmlkj
Forţa ce se exercită asupra unui element de conductor , care face parte dintr-un circuit închis, parcurs de
curentul i, aflat în câmpul magnetic de inducţie este:
l∆
vB→
1.
;BiFd v⋅=→
nmlkj
2.
)vBld(iFdr
×=→→
nmlkj
3.
;Bv)ild(Fd→→→
×=
nmlkj
4.
.ldBiFd→→
⋅⋅=
nmlkj
1. nmlkj
Page 96 of 122
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224.Expresia tensiunii electromotoare indusa prin transformare este:
Maximizeaza
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2.
;HMB→→→
+=
nmlkj
3.
;HHB o
→→→+µ=
nmlkj
4.
.HMB o
→→→+µ=
nmlkj
1.
;ld)Bv(ec
→→→×= ∫
nmlkj
2.
;ldBve→→→
⋅⋅=
nmlkj
Page 97 of 122
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225.Intensitatea campului magnetic determinata de un curent ce trece printr-un conductor rectiliniu infinit lung este:
226.Intensitatea campului magnetic pe axa unei spire circulare, de raza r, parcursa de curentul I este:
3.
;v)Bld(e→→→
×= ∫
nmlkj
4. liBe ⋅⋅=
nmlkj
1.
;d2
iH =
nmlkj
2.
;d
i
2
1H ⋅
π=
nmlkj
3.
;id2H ⋅π=
nmlkj
4.
.e
NiH =
nmlkj
1. nmlkj
Page 98 of 122
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227.Reductanta magnetica se calculeaza cu relatia:
;r2
iH =
2.
;ir2H ⋅π=
nmlkj
3.
;R
r
3
iH
2
3
⋅=
nmlkj
4. Maximizeaza
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nmlkj
1. Maximizeaza
nmlkj
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228.Inductivitatea proprie a unei bobine cilindrice foarte lungi se calculeaza prin relatia:
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2.
;S
lR m
µ=
nmlkj
3.
;l
SR m µ
=
nmlkj
4.
.SlR m ⋅µ=
nmlkj
1.
;l
SNL
2
µ=
nmlkj
2. Maximizeaza
nmlkj
Page 100 of 122
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229.Energia campului magnetic al unui sistem de doua bobine cuplate fara miez feromagnetic, este data de relatia:
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3.
;N
lSL
µ⋅
=
nmlkj
4.
.i
Lφ
=
nmlkj
1.
;iiLL2
1W 2
22121m ⋅⋅=
nmlkj
2.
;iiLiL2
1iL
2
1W 2121
222
211m ++=
nmlkj
3. nmlkj
Page 101 of 122
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230.Printr-un conductor rectiliniu foarte lung, de sectiune neglijabila circula un curent de intensitate I=50A. Sa se calculeze intensitatea campului magnetic H la distanta d=0,8m de axa conductorului,mr=1,01
231.Un conductor rectiliniu de lungime practic infinita este strabatut de curentul I=25A. Cu centrul la distanta d=0,8m de conductor, este situata o spira conductoare ca in figura 29, a carei raza r=0,2m fiind strabatuta de curentul I=2A. Sa se determine intensitatea H in centrul spirei.
Maximizeaza
;iL2
1iL
2
1W 2211m +=
4.
.ii
LL
2
1W
21
21m ⋅
⋅=
nmlkj
1. H=7,09 nmlkj2. H=9,95 nmlkj3. H=12,41 nmlkj4. H=10,12 nmlkj
Page 102 of 122
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232.O bobina de inductivitate L=25mH este parcursa de curent I=10A. Sa se determine energia campului magnetic al bobinei
233.Relatia dintre P,Q si S este:
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1. H=20 nmlkj2. H=10 nmlkj3. H=25 nmlkj4. H=30 nmlkj
1. W=1,40J nmlkj2. W=1,02J nmlkj3. W=1,25J nmlkj4. W=1,45J nmlkj
1. S=P+Q nmlkj2.
;QPS 22 +=
nmlkj
3. S=P-JQ nmlkj
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234.
4. S=P/Q nmlkj
Imaginea lui în complex simplificat este:
π
+ω⋅=6
tsin802i1
1.
;j40320I1 −=−
nmlkj
2.
;j40340I1 ⋅−=−
nmlkj
3. Maximizeaza
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nmlkj
4. j2020I1 −=
−
nmlkj
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235.
Maximizeaza
236.Un receptor trifazat, format din 30 de lampi cu incandescenta, egal repartizate pe faze (montate fiecare intre faza si nul) este alimentat de la o sursa trifazata 3x380/220V. Stiind ca puterea unei lampi este de 100W la 220V si ca nulul are o impedanta neglijabila. Sa se determine puterea activa consumata
237.Un generator de curent alternativ trifazat alimenteaza cu tensiuni simetrice de 3x380/220V un receptor montat in triunghi, cu impedantele: Z12 = Z23 = Z31 = 12+16j. Sa se determine valoarea efectiva a curentului
Se dă schema electrică a unei reţele, reprezentată în figura 34, cu:
Să se calculeze curentul
π
+ω⋅=ω⋅=+=−=+=−−− 2
tsin1002esitsin1002e;j1010Z;j55Z;j1010Z 21321
.I1−
Fig. 34
1. I1=2+3j nmlkj2. I1=2,5+7j nmlkj3. I1=5-7,5j nmlkj4. I1=5+7,5j nmlkj
1. 2000W nmlkj2. 3000W nmlkj3. 1000W nmlkj4. 2500W nmlkj
Page 105 of 122
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pe faze.
238.Sa se determine impedanta echivalenta intre bornele A si B ale retelei pasive reprezentata in figura 37, cu: Z1 = 10-20j; Z2 = 20+10j; Z3 = 10j
Maximizeaza
1. I=19A nmlkj2. I=14A nmlkj3. I=21A nmlkj4. I=17A nmlkj
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1.
;j86ZAB +=
nmlkj
2.
;j42ZAB +=
nmlkj
3.
;j64ZAB −=
nmlkj
4. nmlkj
Page 106 of 122
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239.Sa se determine impedanta echivalenta intre bornele A si B ale retelei pasive reprezentata in figura 38 cu : Z1 = 5+5j; Z2 = 5-5j; Z3 = -5j; Z4 = 5j
240.Capacitatea condensatorului sferic, cu armaturi concentrice, de raza R1 si R2 este:
.j26ZAB +=
Să se determine impedanţa echivalentă între bornele A şi B ale reţelei pasive reprezentată în fig. 38 cu:
.5,5,55,55 4321 jZjZjZjZ =−=−=+=−−−−
1. ZAB = 7,3-2,5j nmlkj2. ZAB = 2,3+5,4j nmlkj3. ZAB = 2,4-3,5j nmlkj4. ZAB = 8,2+5,3j nmlkj
1. Maximizeaza
nmlkj
Page 107 of 122
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241.Teorema lui Gauss se exprima prin relatia:
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2.
;
R
Rln
l2C
1
2⋅
πε=
nmlkj
3. Maximizeaza
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nmlkj
4.
.RR
RR
4
1C
21
21
+⋅
⋅πε
=
nmlkj
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242.Capacitatea echivalenta pentru doua condensatoare legate in serie se poate calcula cu relatia:
1.
;Q
dSEo
∫∫ ε=⋅
nmlkj
2.
;ED ⋅ε=
nmlkj
3.
∫ =⋅ ;0dSE
nmlkj
4.
.UdlH m∫ =⋅
nmlkj
1.
;CCC 21e +=
nmlkj
2. Maximizeaza
nmlkj
Page 109 of 122
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243.Un acumulator cu o capacitate Qd=100Ah a fost descarcat in timpul td=5ore. Sa se determine intensitatea Id a curentului de descarcare.
244.
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3.
;C
1
C
1C
21
e +=
nmlkj
4.
.CC
CCC
21
21e ⋅
+=
nmlkj
1. Id=10A nmlkj2. Id=20A nmlkj3. Id=40A nmlkj4. Id=60A nmlkj
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245.
Maximizeaza
Un circuit absoarbe pe la bornele A şi B o putere P=12,1KW, la o tensiune U=220V. Fiind cunoscute valorile rezistenţelor : R2=5,5Ω, R3=2Ω, R4=2Ω, R5=4Ω. Să se determine valoarea rezistenţei R1 ( fig.44).
1. R=5ohm nmlkj2. R=4ohm nmlkj3. R=6ohm nmlkj4. R=10ohm nmlkj
Să se determine curentul I5 din reţeaua din figura 45. Se cunosc: R1=1,5Ω, R2=R3=5Ω, R4=R5=10Ω, r=0,5, E=100V.
1.
;A3
50I5 =
nmlkj
2.
;A7
45I5 =
nmlkj
3. nmlkj
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1. 1. 2. 3. 4.
2. 1. 2. 3. 4.
3. 1. 2. 3. 4.
4. 1. 2. 3. 4.
5. 1. 2. 3. 4.
6. 1. 2. 3. 4.
7. 1. 2. 3. 4.
8. 1. 2. 3. 4.
9. 1. 2. 3. 4.
10. 1. 2. 3. 4.
11. 1. 2. 3. 4.
12. 1. 2. 3. 4.
13. 1. 2. 3. 4.
14. 1. 2. 3. 4.
15. 1. 2. 3. 4.
16. 1. 2. 3. 4.
17. 1. 2. 3. 4.
;A
7
50I5 =
4. .A
8
25I5 =
nmlkj
nmlkj nmlkji nmlkj nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkji nmlkj nmlkj nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkji nmlkj nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkj nmlkji
Page 112 of 122
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18. 1. 2. 3. 4.
19. 1. 2. 3. 4.
20. 1. 2. 3. 4.
21. 1. 2. 3. 4.
22. 1. 2. 3. 4.
23. 1. 2. 3. 4.
24. 1. 2. 3. 4.
25. 1. 2. 3. 4.
26. 1. 2. 3. 4.
27. 1. 2. 3. 4.
28. 1. 2. 3. 4.
29. 1. 2. 3. 4.
30. 1. 2. 3. 4.
31. 1. 2. 3. 4.
32. 1. 2. 3. 4.
33. 1. 2. 3. 4.
34. 1. 2. 3. 4.
35. 1. 2. 3. 4.
36. 1. 2. 3. 4.
37. 1. 2. 3. 4.
38. 1. 2. 3. 4.
39. 1. 2. 3. 4.
40. 1. 2. 3. 4.
nmlkji nmlkj nmlkj nmlkj
nmlkji nmlkj nmlkj nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkji nmlkj nmlkj nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkji nmlkj nmlkj nmlkj
nmlkji nmlkj nmlkj nmlkj
nmlkji nmlkj nmlkj nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkji nmlkj nmlkj nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkji nmlkj nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkji nmlkj nmlkj nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkji nmlkj
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41. 1. 2. 3. 4.
42. 1. 2. 3. 4.
43. 1. 2. 3. 4.
44. 1. 2. 3. 4.
45. 1. 2. 3. 4.
46. 1. 2. 3. 4.
47. 1. 2. 3. 4.
48. 1. 2. 3. 4.
49. 1. 2. 3. 4.
50. 1. 2. 3. 4.
51. 1. 2. 3. 4.
52. 1. 2. 3. 4.
53. 1. 2. 3. 4.
54. 1. 2. 3. 4.
55. 1. 2. 3. 4.
56. 1. 2. 3. 4.
57. 1. 2. 3. 4.
58. 1. 2. 3. 4.
59. 1. 2. 3. 4.
60. 1. 2. 3. 4.
61. 1. 2. 3. 4.
62. 1. 2. 3. 4.
63. 1. 2. 3. 4.
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkji nmlkj
nmlkji nmlkj nmlkj nmlkj
nmlkj nmlkji nmlkj nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkji nmlkj nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkj nmlkj nmlkji
nmlkj nmlkji nmlkj nmlkj
nmlkj nmlkj nmlkj nmlkji
nmlkji nmlkj nmlkj nmlkj
nmlkj nmlkji nmlkj nmlkj
nmlkj nmlkji nmlkj nmlkj
nmlkj nmlkji nmlkj nmlkj
nmlkj nmlkj nmlkji nmlkj
nmlkji nmlkj nmlkj nmlkj
nmlkj nmlkji nmlkj nmlkj
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64. 1. 2. 3. 4.
65. 1. 2. 3. 4.
66. 1. 2. 3. 4.
67. 1. 2. 3. 4.
68. 1. 2. 3. 4.
69. 1. 2. 3. 4.
70. 1. 2. 3. 4.
71. 1. 2. 3. 4.
72. 1. 2. 3. 4.
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