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Page 1: Only Electrician Mix Question...a. Unity power factor b. Leading power factor c. Lagging power factor d. Depends upon voltage 22. In a Synchronous motor, the magnitude of stator back

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Only Electrician Mix

Question

Page 2: Only Electrician Mix Question...a. Unity power factor b. Leading power factor c. Lagging power factor d. Depends upon voltage 22. In a Synchronous motor, the magnitude of stator back

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1.

An unexcited single phase synchronous motor is :

अनुते्तcजजत ससगल फेज तुल्यnकाली मोटर ह ै-

a. Hysteresis Motor

b. Universal Motor

c. Repulsion Motor

d. AC Series Motor

2.

The most economical and suitable method of starting of single phase motor is

ससगल फेज मोटर को स्टाdटट करने की सबसे सस्तीo और उपयुक्त जिजध ह ै

a. Resistance method प्रजतरोध जिजध

b. Inductance method पे्ररकत्िn जिजध

c. Capacitor Start method कैपेजसटर स्टाiटट जिजध

d. Split phase method जिभक्तट फेज जिजध

3.

Which of the following single phase motors will operate at high power factor ?

जनम्न जलजखत में से कौन सी ससगल फेज मोटर उच्चa पािर फैक्टcर पर चलेगी ?

a. Shaded pole motor छाददत पोल मोटर

b. Capacitor run motor कैपाजसटर रन मोटर

c. Split phase motor जिभक्तट फेज मोटर

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d. Capacitor start motor कैपाजसटर स्टाiटट मोटर

4.

Normally, the auxiliary winding in a single phase induction motor is cut off when

the motor reaches a certain speed except in case of

ससगल फेज पे्ररणा मोटर में सहायक िाइसिंग सामान्य त: उस समय कट – ऑफ हो जाती ह ैजबत

जनम्न जलजखत के अलािा शेष मोटरों में एक जनजित स्पीnिं आ जाती है

a. Shaded pole motor छाददत पोल मोटर

b. Capacitor start, capacitor run motor कैपेजसटर स्टाiटट, कैपेजसटर रन मोटर

c. Capacitor start motor कैपेजसटर स्टाiटट मोटर

d. Split phase motor जिभक्तट फेज मोटर

5.

Torque is produced in the reluctance motor with the help of

ररलेक्टें स मोटर में बलाघूणट (टॉकट) किसिी मदद स ेउत्पतन्न होता ह ै?

a. Copper losses कॉपर हाजनयॉं

b. Hysteresis losses जहस्टेाररजसस हाजनयॉं

c. Magnetic field चुुंबकीय क्षेत्र

d. Magnetic flux चुुंबकीय फ्लक्सi

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6.

In a repulsion motor brushes are connected to

प्रजतकषटण मोटर में बु्रशों को जोडा जाता ह ै:

a. External supply बाहरी सप्लाeई से

b. Stator winding स्टेीटर िाइसिंग से

c. Each other with the help of a jumper wire एक दसूरे से, जुंपर तार की मदद से

d. Motor only at the time of running. जसफट चलते समय मोटर से

7.

A motor which does not have rotor winding is

एक ऐसी मोटर जजसमें रोटर िाइुंजिंग नहीं होती, िह ह ै?

a. Repulsion motor

b. Reluctance motor

c. Hysteresis motor

d. Stepper motor

8.

The single phase motor used generally for ceiling fans is –

सीसलग पुंखा के जलए आमतौर पर प्रयुक्तy ससगल फेज मोटर दकस्मस होती ह ै-

a. Split phase type

b. Capacitor start type

c. Capacitor start and run type

d. Permanent capacitor type

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9.

Which of the following motors will have the highest no – load speed ?

जनम्न जलजखत में से दकस मोटर की गजत शून्यh भार पर उच्चoतम होगी ?

a. Shunt motor शुंट मोटर

b. Cumulative compound motor सुंचयी सुंयुक्तa मोटर

c. Series motor शे्रणी मोटर

d. Differentiate compound motor जिभेदी सुंयुक्तn मोटर

10.

Salient pole rotor is used for

समुन्नtत ध्रुि रोटर का प्रयोग जनम्न जलजखत के जलए दकया जाता ह ै-

a. Low speed generator with more number of poles अजधक ध्रुिों के साथ जनम्नo स्पीnिं जेनरेटर

b. High speed generator with more number of poles अजधक ध्रुिों के साथ उच्चg स्पी िं जेनरेटर

c. Low speed generators with low number of poles कम ध्रुिों के साथ जनम्नa स्पीnिं जेनरेटर

d. High speed generators with low number of poles कम ध्रुिों के साथ उच्चe स्पी िं जेनरेटर

11.

Loss of excitation in large synchronous generators occur when

बड ेतुल्यcकाली जेनरेटरों में उते्तeजन – हाजन उस समय होती ह ैजब -

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a. High leading power factors persists उच्च6 अग्रगामी पािर फैक्टsर लगातार बन रहता ह।ै

b. Loss of power connection of DC supply occurs

िंी.सी. सप्लाoई के पािर कनेक्शहन की हाजन होती है

c. Magnitude of current in half the rated current

करेंट का पररमाण जनधाटररत करेंट का आधा होता ह।ै

d. Loss of stability occurs

जस्थरता में कमी आती ह।ै

12.

The magnetic field in an alternator is developed in the

ऑल्टmरनेटर में चुुंबकीय क्षेत्र जनम्नoजलजखत में उत्पकन्नह होता ह।ै

a. Stator

b. Rotor

c. Armature

d. None of these

13.

An alternator cannot be brought on line if

अल्टlरनेटर को आन – लाइन नहीं दकया जा सकता यदद

a. Its terminal voltage V is identical to the network voltage

b. Its generator frequenc if is equal to the network frequency

c. The phase sequences of the alternator and the network coincide

d. The phase relations of the alternator and the network do not coincide

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14.

One hydro alternator has 20 poles and rotates at 3300 rpm. Then its frequency is

एक हाइड्रो आल्टnरनेटर के 20 पोल ह ैऔर 3300 आर. पी. एम. पर घूणटन करता ह।ै इसकी आिृजत्त क्याि

होगी?

a. 600 Hz

b. 500 Hz

c. 550 Hz

d. 660 Hz

15.

Field system of the cylindrical rotor alternators are wound in the _____.

बेलनाकार रोटर अल्टeरनेटरों की क्षेत्रीय प्रणाजलयाुं.......कुुं िंजलत होती हैं -

a. Slots of the rotor

b. Slots of the stator

c. Slots of the rotor and stator simultaneously

d. On the commutating poles

16.

Methods of improving power factor : -

शजक्त गुणक सुधारने की जिजधयॉं हैं -

a. Static capacitor

b. Synchronous condenser

c. Use of phase advancers

d. All of these

17.

The construction of a synchronous motor is similar to

तुल्यoकाली मोटर की बनािट जनम्नoजलजखत के समान होती ह ै-

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a. A dc compound motor

b. A slip ring induction motor

c. A dc shunt generator

d. An alternator

18.

The synchronous motor runs at

तुल्यyकाली मोटर जनम्नtजलजखत स्पीखिं पर चलती ह ै-

a. Less than synchronous speed

b. Synchronous speed

c. More than synchronous speed

d. None of these

19.

The synchronous motor runs on

तुल्यyकाली मोटर जनम्नrजलजखत पर चलती ह ै-

a. Ac supply

b. Both ac and dc supply

c. Dc supply

d. 3 – phase dc and single phase ac supply

20.

When a synchronous motor is started, the field winding is initially

तुल्यaकाली मोटर जब स्टाaटट की जाती ह ैतब फील्िंt िाइसिंग प्राुंरभ में -

a. Short circuited

b. Open circuited

c. Excited by a D C source

d. None of these

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21.

Synchronous motors are usually operated at

तुल्यrकाली मोटरें आमतौर से जनम्न जलजखत पर प्रचजल त होती -

a. Unity power factor

b. Leading power factor

c. Lagging power factor

d. Depends upon voltage

22.

In a Synchronous motor, the magnitude of stator back e.m.f (Eb) depends on -

समकाजलक मोटर में, स्टेiटर बैक e.m.f (Eb) का पररमाण ...... पर जनभटर करता ह ै-

a. Speed of the motor

b. Load on the motor

c. Dc excitation only

d. Both the speed and rotor flux

23.

In a synchronous motor, damper winding is provided –

तुल्यsकाली मोटर में िंेंपर कुुं िंली लगाने का प्रयोजन -

a. To stabilize motor motion

b. To suppress rotor oscillations

c. To develop necessary starting torque

d. For both 2 and 3/2

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24.

A synchronous machine is called as doubly excited machine because –

तुल्यcकाली मशीनों को दोहरी उते्तlजजत मशीन कहा जाता ह ैक्यों दक -

a. It can be over excited

b. It has two sets of rotor poles

c. Both its rotor and stator are excited

d. It needs twice the normal exciting current

25.

Which of the following cannot be used as a filament of lamps ?

जनम्न जलजखत में से कौन सा लैंप के दफलामेंट के जलए प्रयोग नहीं हो सकता ?

a. Carbon filament

b. Tantalum filament

c. Tungsten filament

d. Nichrome filament

26.

Which of the following does not work on the principle of heating effect of electric

current ?

इलेजक्िक करुंट के ऊष्मdन प्रभाि के जसद्धान्तo पर जनम्नtजलजखत में से क्या. काम नहीं करता ?

a. Water heater

b. Tungsten filament lamp

c. Electric Kettle

d. DC motor

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27.

A fluorescent tube is

फ्लुओरेसेंट टू्यब ह ै-

a. A low pressure mercury vapour lamp

b. A high pressure mercury vapour lamp

c. Both low and high pressure mercury vapour lamp

d. A tungsten filament lamp

28.

Which of the following is a /are gas – discharge lamp (s) ?

थमोस्टैtट की जिधातु जस्िप जनम्नpजलजखत की बनी होती ह ै-

a. Sodium vapour lamp

b. High pressure mercury vapour lamp

c. Low pressure mercury vapour lamp

d. All of these

29.

Bimetal strip of thermostat is made of

थमोस्टैtट की जिधातु जस्िप जनम्नcजलजखत की बनी होती ह ै-

a. Brass – iron

b. Copper – iron

c. Brass – copper

d. Manganese - silver

30.

A choke coil is used for controlling current in an

जनम्नkजलजखत में करेंट का जनयुंजत्रत करने के जलए चोक कॉयल का प्रयोग दकया जाता ह ै-

a. A C circuit only

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b. D C circuit only

c. A C and D C circuit only

d. Integrated circuit

31.

Blinking of a fluorescent tube may be due to

फ्लुओरेसेंट टू्यब की सललदकग जनम्नbजलजखत के कारण हो सकती ह ै-

a. Low ballast rating

b. Low circuit voltage

c. Low temperature

d. Any of these

32.

Two lamps each rated 100 W, 230 V when connected in series across 230 V will

consume

100 W 230 V, िाले दो लैम्पों को 230 V पर शे्रणी में लगाया जाता ह ैतब जबजली की खपत होगी -

a. 25 W

b. 50 W

c. 200 W

d. 400 W

33.

For safety, the switches should control the -

सुरक्षा के दजृिकोण से जस्िचों को जनम्नोजलजखत का जनयुंत्रण करना चाजहए -

a. Neutral wire

b. Phase wire

c. Earth wire

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d. Any wire

34.

Two way single pole switch controls the connection of

टू िे ससगल पोल जस्िच जनम्नcजलजखत के कनेक्शfन का कुं िोल करता है

a. One wire to one position

b. One wire to two position

c. Two wires to two position

d. Two wires to four position

35.

The function of a choke used with fluorescent tube on a.c. supply is

प्रत्याcिती धारा सप्लाiई पर फ्लुओरोसेंट टू्यब के साथ प्रयुक्तत चोक का कायट ह।ै

a. To produce high voltage to kick start the tube

b. To limit the magnitude of discharge current of the tube while running

c. Both of these

d. None of these

36.

Which of the following lamps given monochromatic light ?

जनम्न जलजखत में से कौन – सा लैंप एकिणीय प्रकाश दगेा ?

a. Sodium vapour lamp

b. Mercury vapour lamp

c. GLS lamp

d. Tube light

37.

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In a fluorescent tube circuit, the function of choke is primarily to

प्रजतदीप्तeशील (फ्लुओरेसेंट) टू्यब पररपथ में, चोक का कायट प्राथजमक रूप से क्यात ह ै?

a. Reduce the flicker

b. Reduce the starting current

c. Improve the brightness of the tube

d. Initiate the discharge

38.

Voltage required to operate a neon – sign tube depends upon :

एक जनयॉन – टू्यब के प्रचालन के जलए आिश्यiक िोल्टsता............. पर जनभटर करता ह ै-

a. Length of the tube

b. Tube material

c. Diameter of the tube

d. Thickness of the tube

39.

A switch is a device used to –

जस्िच का कायट हैं -

a. Oppose the current

b. Open and close the electric circuit

c. Provide current

d. Store the energy

40.

Tall buildings are provided with pointed conductors to

ऊँची इमारतों में नुकीले चालक लगाए जाते हैं क्योsदक िह

a. Repel charged clouds

b. Remove induced charges by the clouds

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c. Remove charges from clouds and pass them on to earth

d. Serve as antenna for radio and T.V. receivers

41.

In Air circuit breaker, the formation of are is stopped by

एयर सर्ककट बे्रकर में आकट को बनने से जनम्नeजलजखत में से दकसके िारा रोका जाता ह ै?

a. Air pressure

b. Oil pressure

c. Use of relays

d. Water pressure

42.

For a given length, metallic conduit in comparison to PVC conduit :

दकसी जनजित लुंबाई के जलए, पीिीसी कुं डू्यट की तुलना में धाजत्िक कुं डू्यट :

a. Is light in weight

b. Is heavy in weight

c. Is equal to weight

d. Is negligible in weight

43.

250 िोल्टg से कम की िोल्ट ता कहलाती ह ै–

a. LT (Low Tension)

b. HT (High Tension)

c. MT (Medium Tension)

d. EHT (Extra High Tension)

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44.

For high head and low discharge, the water turbine used is :

हाई हिें तथा जनम्नd आस्त्राaि के जलए.............. िॉटर टरबाइन का उपयोग होता ह ै-

a. Pelton wheel

b. Kaplan turbine

c. Francis turbine

d. Propeller turbine

45.

Flapper nozzle is used in a/an …..controller –

फ्लेपर नोजल का प्रयोग .......... जनयुंत्रक में दकया जाता ह ै-

a. Electronic

b. Hydraulic

c. Neumatic

d. electrical

46.

Which of the following distribution system is not normally used ?

आमतौर पर जनम्नoजलजखत में से दकस जितरण प्रणाली का प्रयोग नहीं दकया जाता ?

a. 3 phase, 4 wire

b. 3 phase, 3 wire

c. Single phase, 3 wire

d. Single phase, 4 wire

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47.

Which of the following devices automatically interrupts the supply in the event of

surges ?

प्रोत्क?षों के मामले में जनम्नlजलजखत में से कौन – सी युजक्त सप्ला ई को रोक दतेी ह ै?

a. Earthing switch

b. Series reactor

c. Isolator

d. Circuit breaker

48.

Devices which convert light energy to electrical energy are called

प्रकाश ऊजाट को िैद्युत ऊजाट में पररिर्ततत करने िाली युजक्तयाुं कहलाती हैं

a. Primary cells

b. Secondary cells

c. Photographic devices

d. Photoelectric devices

49.

Which of the following resources is not included in the renewable source of energy ?

ऊजाट के निीकरणीय स्त्रो त में जनम्नlजलजखत सुंसाधन सजम्मजलत नहीं है

a. Solar energy

b. Wind energy

c. Nuclear energy

d. Bio mass gas energy

50.

Load factor during a period is

दकसी अिजध के दौरान लोिं फैक्टiर होता ह ै-

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a. Average load/installed load

b. Average load/maximum load

c. Maximum load/average load

d. Maximum load/installed capacity

51.

Capital cost per MWh is highest is case of

पूुंजीगत लागत प्रजत मेगािाट घुंटा जनम्नsजलजखत में अजधकतम होती ह ै-

a. Steam power plant

b. Diesel engine power plant

c. Nuclear power plant

d. Hydroelectric power plant

52.

The type of alternator used in hydroelectric power stations is :

जलजिद्युतीय स्टेrशन में उपयोग दकए जाने िाले प्रत्या ितटक.......... प्रकार का होता ह ै-

a. Non salient pole alternator

b. Salient pole alternator

c. Turbo generator

d. Stream turbine alternator

53.

Minimum operating cost is found in ______.

न्यmूनतम पररचालन व्यnय ______ में पायी जाती ह।ै

a. Thermal power plant

b. Diesel power plant

c. Hydro plant

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d. Nuclear power plant

54.

Which circuit breaker is generally used in railway traction ?

रेलिे सुंकषटण में सामान्यgत: प्रयुक्तi पररपथ जियोजक ह ै-

a. SF6 gas circuit breaker

b. Air break circuit breaker

c. Vacuum circuit breaker

d. Minimum oil circuit breaker

55.

The most common type of fault in an overhead transmission line is

ओिर हिैं िाुंसजमशन लाइन में सबसे सामान्यh दकस्मo का दोष होता ह ै-

a. Double line to ground fault

b. Single line to ground fault

c. 3 – phase fault

d. Line to line fault

56.

Ferranti effect occurs

फेराुंटी प्रभाि होता ह ै-

a. Under no load,. Receiving end voltage greater than sending end voltage

b. Under full load, receiving end voltage greater than sending end voltage

c. Under no load, sending end voltage greater than receiving and voltage

d. Under full load, sending end voltage greater than receiving end voltage

57.

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Which type of insulator is used in stay wire ?

स्टेhिायर में दकस टाइप का इन्सwुलेटर प्रयोग दकया जाता ह ै-

a. Egg type

b. Pin type

c. Shackle type

d. Suspension type

58.

Which of the following is best suited to protect equipment against high voltage

surges ?

जनम्नsजल जखत में से उच्चo िोल्टेnज के जलए सबसे अच्छाs उपकरण कौन – सा ह ै-

a. Thyrite arrestors

b. Horn gap arrestors

c. Rod gap arrestors

d. Overhead ground wire

59.

The use of which of the following poles is preferred for service lines ?

सर्तिस लाईन के जलए जनम्नfजलजखत में से दकस खुंभे को प्राथजमकता दी जाती ह ै?

a. R.C.C.

b. Iron tubular

c. Wooden

d. Steel tower

60.

Cross arm is fixed to the pole to

खुंभे से जतरछी भुजा लगाने का प्रयोजन ह ै

a. Strengthen the pole

b. Fix the insulator

c. Bind wire

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d. Draw the neutral wire

61.

Power supply for railway passenger coach lighting and fan services is

रेलिे यात्री कोच की जबजली और पुंखे के जलए पॉिर सप्लाnई होती ह ै-

a. Single phase 25 Hz

b. Single phase 50 Hz

c. Three phase 50 Hz ac

d. Direct current

62.

If the neutral of the three phase distribution is not earthed, the voltage in different

phrases will

तीन फेज जिंस्िी लयpूशन का न्यsूिल यदद अथट (भूुंसपर्ककत) न किया जाए तब जिजभन्न फेजों में िोल्टे ज

a. Remain stable at all loads

b. Increase in the phase which is lightly loaded

c. Increase in the phase which is heavily loaded

d. Increase in the phrases other than the one lightly loaded

63.

For a three phase, 4 – wire system, the colour of earth / neutral wire is

तीन फेज, 4 – तार जसस्टcम के जलए अथट/न्यूपिल तार का रुंग होता ह।ै

a. White

b. Red

c. Black

d. Blue

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64.

Minimum clearance of low and medium lines ground across streets is

गजलयों में जनम्नe और माध्यmम िोल्टेaज लाइनों की भूतल से ऊँचाई कम से कम होनी चाजहए।

a. 8 Feet

b. 12 Feet

c. 19 Feet

d. 30 Feet

65.

Material generally used for bus – bar is

बस – बार के जलए आमतौर पर जनम्नमजलजखत पदाथट का प्रयोग दकया जाता ह।ै

a. Copper

b. Aluminum

c. Steel

d. Tungsten

66.

The line voltage of RCC tower is usually

आरसीसी टािरों की लाइन िोल्टeता सामान्य त: होती ह।ै

a. 230 V to 33 k V

b. 20 V to 1000 kV

c. 230 V to 11 kV

d. 11 kV to 33 kV

67.

Specific gravity of Aluminum is –

ऐल्युfजमजनयम का जिजशि गुरूत्िल............. ह।ै

a. 5.9 g/cc

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b. 8.9 g/cc

c. 2.7 g/cc

d. 4.3 g/cc

68.

Which of the following technique is used for energy production at lower heads ?

कम जिभि पर शजक्त उत्पा दन के जलए जनम्नe में से दकस प्रणाली का उपयोग दकया जाता ह ै?

a. Radial Technique

b. Distribution Technique

c. Ring – Main Distribution Technique

d. Inter Connected Technique

69.

Thimbles are used at –

जथम्लेes स का प्रयोग.............में दकया जाता ह।ै

a. High voltage

b. Low voltage

c. Very high voltage

d. Normal voltage

70.

AC transmission requires at least ____ conductors.

AC सुंचरण में न्यeूनतम _______चालकों की आिश्यतकता होती ह।ै

a. 2

b. 3

c. 4

d. 5

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