ies mechanical engineering paper 1 2004

7/27/2019 IES Mechanical Engineering Paper 1 2004

http://slidepdf.com/reader/full/ies-mechanical-engineering-paper-1-2004 1/16

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MECHANICAL ENGINEERING J--==::==!PAPER-I

I .

1.

3.

II small sphere of outer area (1,6 m1 islotaUy enc losed by a large cubical bail.The shape facto r of hail wit.h respect tosphere os 0.11!14. Whatos the measure of theinternal side ofthe cubical hail'l

a 4 111

b .S m

c. 6 m

d. Ill 111

ln a l'apour compressor refrigerationsystem. the compressor capacity fs 2100kj/minu te 3Jld he.'\1 rejection factor is I l .Whnt ·\\iU . respecti,·ely be d1e heat rejectedfrom the condenser and C 00. P 1

a 5040 kJ/rnmute ru1d 5

b. 2520 kJ/rninule and5

c, 1520 kJ/mmute and 4

d 5040 IJ/rninut., and 4

Which one of tbe following statem ems isC()rrecl'!

In a domestic rcfTigerator periodic

derrosting os requo red because fros tinga causes corrosion or materials

b. reduces heat extraction

c. overcools food stuff

d. partially blocks ~ : : e r a n t l l o wAir at 35°C DBT and 25°C de11 (,IOint

tem perature passes through the wa tershower. hose temperature 1s maintruned at

zo•c What is the process inrolred''

a. Cooling and humidification

b. Semible coolingc. Cooling and dehumidilicahon

u Heating and humidification

5 Consider the fo llo11ing statements·

I The specific m i d i t ~ JS Ote ratio ofUte

mass or wacer ··apour 10 the mass or

dry air in a given volume of the

mi:"\ture

2. The relacre humidity of theatmospheric alr is the ratio of the.actual mass of the water \1apour an a

6.

7,

given volu me to thnt 11 hich i1 wouldhave of ot \\ere saturated at the sametemperature

3. The degree of saturatoon is de fined asLhe ratio of !he specific humidity at a

l u r e lo the specific humidity of tbemixture when saturated at the sametemperature

Which of the stalemems given above are

corre<:l''

a. l and2

b. 2 and 3c. I and 3

d, 1, 2and3

Atmospheric air 81 dry bulb tempermure of

ts•c enters a hea ting cool 11hose surfacetemperature is maintained at 40°C. The airleaves the heating coil nt :!5°C, What willbe thf) by·pass fhctor of the i n ~ t coi I'/

a. 0,376

b. 0.4

c. (l.(i

d. 0.67

Veloci ty of air passing through urectangular duel and a circu lar duGI issame. Which one of the Followi ng Iscorrect e'pression for the equivalentdiameter of the ci ocular duct in respect of arectangular duct for the same pressure lossper unit length ? (a and b are the lengtl1 andbreath of the rec tMgular duel cross·section)

a+h

a,ab

b,2ob

a+b

2aC,

a-b

d1b

O+h

Whtch ouc of the following swtements iscorrect'I



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13.

" Eftecli,•e temperature Is Ute indox

' ' hich correlates lhe combined e O ' e e t ~elf air clry hulb tcmpcrnturc. aichurnidity nnd air m o v o r IJJ)ou

human comfort

b. Tbe value of ofti:ctive tempernun-e in

wi nter and summer \ o u l d be '"me for

humun comfortc. EIJ'e.:live t<anpernLure and wet bulh

l o m p ~ , · o t u r o ""'one •nd Ue u mII. Th e volue of cll\lc.tiw lcmperutur<>

slwn ld be higher in Winter U1n1o in

summer for comfort

Which of thd tollow ing nrc n01mally

cle$ired comrort cundi•ion• in "" air~ n c t i l i system?

n, 2YC DBT ruod so•,, RH

b 22"C 013'1' and 9()')., RH

c. 15°\ PBT and 75°o RHd. 1s•c DBT and -1(1% RH

ln an air conditioning plant therefrigeration load Oil the coil b lOll Tit

Th o mns• nnd enthalpy of nlr leaving Utecoil ore 420 kg/minute ond 4(1 k11k£

respectively. Wha t· will be the enthalpy of

tire air a t Ute inlet to the coi l und er tl•""e

condition>1

d. SOkJ kg

"·90U 1 kll

C, 100 U/kg

d. 1112.5 kJ/kg

U c t ~ e i e n t uf contc3ction Jl the \ 'C IJ:I

cuutro ac • j,; <:<jUO I tn 0.()2, U\tU wbot willbtt the dynamic loss ~ o o f f i c i " n in. suddeu

conlrnctic>n in l i r ~ n d i t i o n i n g du ct1

(1. 0.25

b. 0.3 75

c. o.ss

ol 0.65

An of gravity 0.9 b.as Vis<W.!Iityof 0.28 Slokos ot 38"C. W1L1 l will be it•

v ~ o o s i y in Nsim2.'f

• . 0.2520

" (1,03 11

"' 0.0252

d. 0.0206

Which I! IJC o'f tbe JiJUO\\ iug i8 thv COit L<:t

expc.,ssio n for the cr iticn j>res•urc rMio of

" nozzle'/

14.

15.

16.

17.

I

a. [flf

b. lf lr

e. ( 2 \-71II - i )

I

d. - r··n- 1

Who! is the crilicaJ pressure rotio for

isentropic no<!Zie tlow with ratio of

<pecific b.:aB as 1,5?

a. (tl.Sr'

h. ((} ,g)l .

c. (1.25)0·1'

d. ( 1.25)'

Consider the follo"-ing statements

1. The speed of r<)totion of the moving

clement• of gas turbines is muchlUgher titan ~ e uC sh:arn tu•·bine$

2. Gas IUrhine plants. andla rg.,.. in •W: lh>n steam turbine lll•nts

3. Gas turbine• require cooling water forits opuraliQJl.S

4. AlmoSL any k.iod of fuel cau be usedwith gas turbines

\V11ioh of tho · ~ • t e m e n t s given above "" '

co rrect?

a. l and 2

b. land 3

e. l •nd 4

<L 3 and 4·

Which one of tl•• oUowing is tltc fb>tULC

o f press ure compounding (Rete:Ju

staging.)1

a, Low efficiency m low ro tational speed.•

b. High e f f i c i e n c with low fluidvt:lnci lie'i

c. High eii iciency with high tlnid

velocities

d. Low eiiiciency at bigh cotational

speeds

Jn Parson·, rcuct.ic)ll turbines. the 'c:tc.dtydiagram tl'iung iC!I at the inlet arid <lllt.lcllll'C

which of the lb llowi118?

a. m m e t r i c : t 1



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b lsoscdes

c, Rtght-unglcd

d. Congruenl

Which o or the fo lio" ihg statements iscorrec(/

In rcctprocoting compressors. one sllouldauu at compressing the air

a. l'uliabaticnlly

b. Iscntroptc ali)

c. isotltcrmul l)

d. p o l ~ r t r o p t c u l l yl tt Parson's turbinu if (U) ts ttoa.lc ungk.

lhett wllm is the n u t ~ f m u m ~ f l i c l e n c \ of

the ht(binc'l ·

lL

h

c

t1

C(IS l'

{IHOS<t)

2cos'a

(1+Cos'a)

2cos' a

{1-c<lsa)

cos' a

(1 +2cos' 11)

Whm is the va lue M the r(hcmmulti-stage lllrhinc'?

a. I.OJ ro 1.04

b 1.10 to 1.20c. (J,90 lo I ()()

d. 1,10 to us

rnctor fn

A c o m p r ~ - s s l b nuid llows lhrough n

passage as showu in the above diaarnm.The ' 'eloci ty o f the flUid nt the poml A is400 m/s.

Which oneof he lollowh1g is correct"

Allhc point B. the fluid c ~ p c r i c n c c sa. an incrca.;e In velocity and decrease '"

pressu re

h a decrease in vdooity and i n c r e a s ~ inpressure

c. n decrease in velocity and pres

J <•f l bd an 11tcreasc in vclocily :md pressure

22.. In whic h vnc of tl1c following s1ea•nturbines. steam iS taken from variouspoints along the turbine. sole i) for feed

water heming?

a Extraction turbine

b. Bleeder turbine

c. Regcnernt1vc turhmc

cl R c h ~ m turbine

23 . Which one of the lollowrng ts the correctexpression lbr 1he degree ol'rcaction lo r nna-:ial-llow co mp ressor'l

24

25

20.

a.

b.

c.

d

Work inpul lo the ro1or

Work inpm to Lhc s t a ~ eC h a n g ~ or en1halpy on the ro lor

Change ofemhalJIY in the s1age

l>ressurc rtsc 111 the ro10r

P r e ~ l f U f t ' ' ise it1 lJh! stage

ISCIItflliJic work

Actual work

Assen i<>n (A ): A simple or elen lerrlill\'curburc!l>r provide< progressively richnnxturc. with incrcusing air flow .

Rensou (R) · 111e density of lite air terJds 10

Increase as lhe nue of air now llterea.<.:s .

a. Both A and Rare individuall) true andR is 1hc correct exp llUlati<>n ol A

h. Both A and R ~ individ11alll 1n1c hnlR is 1101 the correct CXJ!IanaLIOII of' /1

c A is true but R is lalse

d. A is fulsc but R i,

Assertion (A): In lumped h ~ ; n Cltlltlcity~ y s t c m s lhe l c m p ~ r a t u r c gradic nl wilhinUte system is neglrgibk.

Reason (R): In analysis ofluntped Cltpncil}~ y s 1 c m s . lhc thermnl c!lndutl iVII'V M the

m ~ c r i a is considered v ~ r y hi!lh

nrespective of the si7.c tJ f the r c u 1a. Both A and R tlfe individu:tll) true lllld

R d1e corrcti. exp lanation ofA

b. !3oth A and Rate individuoll v true butR is not the correct e."(>IMario"n ofA

c. A is lntc.h11t R Is fnlse

d. A is fulse but R is true

'lssortion (A); SuiJ cool ing of rdrigcrantilqmd increases d1e cocfHcient of

performance ofa refrigeration cycle.



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28.

29.

Renson (JU : Suh cooling rodUCC$the workre.quiremcmt ofa o:frig.:rolion cycle.

a. Both ,\ :md R are individually true and

'R is conect eXJllanation ofA

b Both A and R are individt1.1lly true bmR is not the o r r e e .:xplanution of A

c, A IJue but R is f a l ~ cd. A is but R Is bue

Assertiou (A): A circular plate i•

imtncl>lcd uo a ~ q u i d w i ~ t it> J ~ < : r i p b c rtouching Uu: fl'e\! !lUJace :&ud tl1c: pla.r1c

mnkes an angle fl with the free surtace

With different vnlues of 9, the position of

n l ' r < : uf poossult II he difl®nt.

Reason (R ); S ince the cenu-e ofpressure is

dt>Jl"lldt:nt 011 second mom"''' oJ nrca. with

dilferl'111 \'41= e of. secoo(l m o m ~ 1 1 t of

M'e.'t for the cirotilar plate wil l cluonge.

Both A and R are individually true andR is the correct expl•u•tion ofA

b. B o ~ t A and Ra re individu•llv trve but'R is not tlte correct p a o a l i ~ 11f A

c. A is I.Jue bul k ;,,

tl A is I l l ~ hut R is true

Asserlion (A): In a ..upersonic nonle. withsonic condition at lhe throat. any reduction

of dowustroaru pnlSS uro wiU uol be felt ul

the i.nlot of the no7zlc.

RcJ•<ln (R): The l u r b n u c>u>clld m ~ t r e : t r J l of lmtx:rs<,mie tlhw!ii rrnvels nt

s•1nic v e i ~ J < ; i y which c.lJlnnl JlrOJ)agMeupstr¢3ntby Mnch cone.

u. Both .·\ and R l l l ' t iJJdividu>JJy true andR is Uuocon'llct cxplan>tion ofA

b. Bolb A 011d R arc individually true bul

R 1;, not the o m : c t p l ~ n a t i or1\

c. A is tmc bul R is false

cl. fobc but R. i• true

As•crtion (t\): For the .aouc power. Ut<>

o>1or of on impul•c turbine nce<l not lx: "'l:lrge ns that ofa reacli<m norhin e.

Reason (R): In the case of a reActionturbine. wa(eo· has In he admitted to th•ruwtt:t' OJ'tluud its cnli1·.: cin:umfcrcucc.

a. BoOt A and R lll'e individually true and

R is Lbc coro..,cl cxpl=tion ofA

h. Both • aud R !Ire individWIU) true hutR is not the correct cxp lnnlllinn of A

c. AU< ttuc but R is f 1 1 l ~d. A is false but R is true

30.

31.

33.

34.

.1n l I i

Assertion (A): For higher specific speedsrndi•l llow pumps the gn!4testdliciency.

Rea•on (R): Pumps ha,'ing larger

discharge under sruollcr b < > O U ha w highi:r

spocific

a. Goth A and R ore ind ividuall)' tru e. and

R is the c<>mlC I e><plonntion ofAb. Both A nnd R aro1ntlfvidualll true but

R is not the .:orrect cxplanatio.n ol' A

c. A is tn>e but R is r.,lse

d. A is f•L•e but R i$ bue

Assertion (.\) : fh e volul.c casins of aceottrifugal t}ump helps in creating the higb

velocity head n""'ssary for enabling waterflow upwnrds to a higher level

Reason (R): Tite water llow' lbrough udivetfring llil9S"ge in the volute chamber

a. Both A nod R 3f'e individually true andR i$ the correct explanation of A

b Both A and R nre •ttclividu•lly true hutR is not the cotTI!<!t explaMtion ofA

c. <\ is true hut R i• false

d. i\ is f ; t ~ bul R is true

Which one of the folll'wong co rrectlydef111es I K. as per the intel'llolionallyaccepted dofiuitiou oflemP<'ralurc scale')

a. ll l OOll.o nf lh" dlff.:reuce betweennormal boiliu.g point :md uonual

frow.ing point aJ: water

b. l/27j, ISib of the norm" I frut:?.ing

point ofw•ler

I0() limel l the ol ifl'erence between the

t r i p l ~ pnint .,r w o t ~ r >nd the noron•l

d < . : " l i n point ofwaterd. 11273. 15tlo ofilie b·iple point ofwoter

ho a steady-now adiab•tic turbine, tloe

cilllllgcs in. ilie intctm l n ~ r g entl>>lpy,kinetic energy and potcntiol cnOl'gy of the

working fluid.fro

m inlet toe x i ~

•re - 100kJ /kg. 1-10 kJikg. - 10 kJ/kg Dlltl 0 kJ tkg

rospoctively. Which ono of the fo llowing

gives the amount of wqrk develop ed by Ueturhine?

• . 100 k:Jikg

b. 110 ld lkg

c. 140 kJI!<Jl

d. 150 kJII<g

An idcnl gas undcrgu<-s au i•olilerm;ol

p n n s i o n from •tote R to .t,.te S m •



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37

turbine ns shown 111 lbc dmgrnm given

bclo\1

2 .0 - - -

u.bar1 0 - - ~T

0 I 0..!....-.. \' (m ' )

The area of shaded region ts lOOO Nm.What is the amoun t is turbine "ol'k doneduring the process'/

a. 14.000 Nm

b, 12,000 Nm

c, I I OOl/ Nm

d. I J,OOO Nm

170 ld of hea L s supp lied to a system atco nstnut volume. Then the system rejoots

18lJ kJ or heat at constant pressure and 40kJ of work IS done on tl. 1'ho system tsfinally brough t to 1rs original stat<" b)adiabatic process. If the Initial value of

mtemo l enorro is 100 k.l , then which oneof tile following sta tements is correc t''

a. highe.st \'Slue of intemn1 cncrrooccurs ol the end ol' the constantvolume process

b. The htgbcsl va lue or mlemal cncrb'Yoccur.; nt tile end or consmn t pressure

processc. The wgltest ••aluc of mlemal coer!:}

occurs n.frcr adiabatic cxp ans iou

d lntcmnl energy is equal nLnil points

An insulated bqx contnmlng 0.5 kg of agas having C, = 0.9X kJ/kg, K l'alls from nballoon 4 km Jbove the enrtlos sud'ace.

Whnt wi ll be the tcJnpera turc rise or thegus when the box bo ts theground'/

a, 0 I (

b 20 K

c. ~ ( 1 1 :d. 110 K

In a heat <UJgine opcratiog tn a oyclcbe tween a source temperature of 606°(; ~ n d a sink temperahore of 2o•c. whn t willbe the least ra te or heat rejec-tion per Wnet output of the engine?

n. 0.50kW

b 0.667 kW

c. l,5kW

So( II>

d. 00341 kW

Two re•·crsiblc engine operate between

lhcmtal reservoirs at 1200 K. T7 K and 30(1K such that Ist, engine rcceh es ilent [rom

12()() K rcscn·oir ,1nd rejects heal tothennal reservoir ol T, K. while 2nd

c.ugUJc receives heut Croru " n n arcscn

·oir at T1 K aud rejects bcJL to thethe nnal reservOir ul 3UO K The effic1encyofboth lhc ongoncs ts equal

What is value of tetnpCr.ltu rc T,?

400 K

b. 51Kl K

c. 600 K

d. 700 K

39 A perfect gas ul 27°C was bc;tlcd until its,-olume was doubled using the fo llowingU1rce different jlrocesses separately

1 COn5tanl pressure procc,ss

2. lsO!I>ermal process

3. Jscot!opic process

Which one of the fo llo11ing is the eorrcc.tsequence in (he order of increasi·ng vaJue

of ti1e Jiual temperature of the gns reachedby using the ~ b o w tbrce differen tprocesses?

n. 1·2-3

b. 2-3- 1

c. 3-2- 1d. 3-1-2

411. A system undergoes a process duringwhich bea t t!ansler to the system perdegree increase io t e m p ~ r a t u r is gh•ctl bythe C<nntlon

dQ I <IT ; 1 .0 kJ/"C The work done bl ' the

~ s t e m pet degree !ncrcssc ln tcmpctnlureis !Jh•en by the equa tion

dW /dT = 2 • H l T 1vhcre T 1s in •c. Ifdunng the process, the temperature of

water ,·aries from IIJO•C to 150"C. whatwtll be the cbange Ul internal energy'/

'" 125 kJ

b. -250 kJ

c. 625 kJ

d. - 1250

41 One kg of air is t.o tlJe fo llow ingprocesses:

I. Airexpands l e r m a l from 6 !Jar to3 bar.



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1. Alr is o m p r e . s e d to h ~ l f l h e volume tot

con5t3nl pressure. .

3. Heat is supplied to nir at constantvolume lilllhe

4. pressure becomes Ulfeefo ld

Tn which Qf i l 1 ~ ol,ove process.,., the

cbonge 111 enb'OJY I ' ill positive?

a. I and 2

h. 2nnd

1and 3

(J. 1. 2nnd 3

What will be tl1e loss of <WaJiabla enwljy

assodoted with U>e transfer of I0(\0 kj ofheot from constant tempenture sy.tcnt at

600 !>. to •nolltcr ol ~ O ( J K when lhu

em·imnment temperature is 300 K'l

a. !50 ld

b 2.50 kJ.:.. 500 kJ

d. 700 kJ

llto vjril1lion of t u r l i J i u u ptt:S-5Utc witha t u m t i t"llpel'Oture fnr a liquid ; , 0,I

h : t ~ K at ..11)0 K. 'llte •pecilic vofum"" vf

so turoted liquid ond dr) saliu'altd v•pnur. tl 400 K oro 0 lS l und 0.00 L m3·1tq.

Whal will be the vo lue of Intent heat ofVllporiz.,.ion using n u s i • J . ~ C'lnYPcnmetju.11illn?

"· 1600(1 kJikgb. 1600 k.Jikg

c. IIM)O J,;Jikg

cl I ()(} k /kg

Which one of the fctllowing r e p r . , . < : n L the

CO ndensation Of a mil<tUre Of snturatedliquid :and $a\Urnted V3pour onenlhalpy-ontropy diagrom

a. A hot·iz.untallitto

b. An incliued liuc ufcouslartl s lope

1!. A vc:l'tkaltinc-

(l A curved tine

For a two-stage r e d p r o C < ~ uir

.:omprussor. the suction prussure is LS barand tho delivery pressure i• 54 bar. Wh•llsthevalue of the idea l inlencooler pr.,.sura'/

a. 6 bMb. ? bnr

Q . 27.75 bJJ'

d. 9/ .,fi bat

46.

-17.

-18.

-19.

6 " ' 16Which ol the t'ollo"in_g action ($)lncreMt(s) the knocking t e n d e n ~ in the Slengine?

a. lncr.:asing mixture s t r ~ ne q u t l e n c ~ rollo 1.4

b. Rc l3rding the spa.iland increasing Ut.;

compress ion ralio

c. lucrcos ing tho oompressiou ratiu andreducing engine speed

d. [noroo.,ing both mixture strength

heyond equivolenoe a t i o ( ~ ) = l .4 and

the compression r• tio

Which Qf lbe tollowing feahtn.>(s)used in the cCtmhtt<liun h n m l x l r design lut'tlduco Sl eJiginc I.Jwck.?

a. Spark plug locotcd owoy from " " h a u ~ L,-olue, W J J d g ~ . : shJ_pcd combortion

t hilmber nncl ll:tme i.r.wel

dis l:anceb. Wedye sh•J'<'<I combustion ch•mber

c. Wedge •h;tped .:ombustion • ~ a r n b . , . -"" '1 hort namu I avel distan ce;

d. SpMk plug loca tcd awoy l'rorn exhou•t\ ' Olue. !hort illlme trove I distuoce itndttidc vnlue de sign

Which of lite following f.1clor(11)

i n c r c n ~ < l ( • Ihe tendency for knocking inOte CJ. engine'/

a. lncreosing both the compression rnrio

aml thecooluullemperatomo

b. lncrcosing bt>lh U1 e •f1Ced and lh<>

injc.;;tiun udV11'cc

c. lncrcosiug the sp<:cd, inj(:elioo advanceuoli coolant loruperature

d. rncrc.as-ing lhu- oomptcssiou rntio

1\1J toh List I (:;1. Enf ine Op•l'lltionolMode) willt List T1 (Atr fitol RAtio by

Mass) and select the correct onswer;

I I

A, IdlingB. Cru ising

C. M:tx.imum puw"r

D. Cold t ~ r t i uLi st Il

l. 4:I

2 10 : I

3. 12.5 : I

4. 16 : I

5. 14.8:1



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S2.

Codes;

A B c D

:h 2,,

3

h. 5 ~ I 3

"· 2 3 5 l(l 5. 3 4

r mlhe l'ollctwing sratetncnls for •mul ti-jet Clll'burelor-

L Accc leration jet is located just behindthe lhrotllc value

2. Idle jet is located close lo lhc choke

3. !\f:tln jet alone !HIJ'plics pclroJ ut

normal engine speed.1

Wlaicb of the s tntemenl• given above nrccu rro:<.1'1

• ·

h. 1 and 2

2 and 3

d. I :md 3

Tho • toichimueu·ic air· fuel ratio for petrol

i• 15 : L \\1oat i• tllo aulfual ratio required

tbrmaximum power?

;r, 16: l - IR; I

b. LS: I

c. 12 : 1- LK : 1

d. 9 : 1 - 11 : 1

Con.ider ll!e fol!owill£, $lall:ments witlt

reference to oupercltnrging one. enginesL Reciprocating compressors ar<f

inv3rinbly used for htgh degree of'

supe1·charging

2. RolMy comprusors like rools blowersqui«o suitnble lot lo" degree of

sup<ni:harging

3. t\xil> l Oow compressors are most<X>mrnonly employed for superchargingd lose l cngioe; llscd in heavy duty

lrOusporl vehicles

4. Centrifugal .:<>nip"""''·"' ore forturbo -chor·giug

Which of tl1d ~ . . , , ~ , l s given nbo\ llCO rTCCI'/

" · 1 and 2

b. 2 and 3

o. I a n d ~d. 2 il.lld

53 . 11><; je t exit •·cloeity fhun a r o e ~ c lis 2700 m ·n,c o"Yaalllligbt velncity io

54.

55.

56.

7 1>1 f {,

l350 rnis. What •• the propulsiveemciency of the llnit'l

a. 90"-'>.

b. 66 .66"u

c. 50'1o

d. -... ..

What is U1u rntlo of i s p l o ~ m ~ n t thickness

lo momentum L h i c i \ l ~ S - for linenr velocityllistribution overn Oat pi :ate'/

•. ub. 2.0

2. 2,5

3. 3.0

Consider the li• llowiug !ltnlerncntsn:g:mling l>miMr subbyer <Jf bc1un1orylayer n(lw

I. The laminar sublayer nn ly in a

"'lliun lhal occurs before !be forllla lionof laminar boundary layer

2. The l:uninur sublnyer is n 1 nextto the -w31l where the \ li.scous force is

predominant while the rest of the Oowis turbulent

:>. The l:lrninar •ubloyer oucur<:b on ly in

turbulent flo\\ pM! " srnoollt plate

Wbioh ofUte l l l l C J t t ~ ' l l t s s ivcn abo\'c isi>l"'co rrect?

D, L2rutd 3

b. 1 and 2c. 011ly 2

d. land 3

Matcl1 List I (lllow Depth) wiUt List II

(B••Ic FJydrnulic Condition Associ:ltcdTherewith) nnd sc lact tho correct amnver

List l

A. Conjugate deplh

B. Critical depth

c. r\llcmotc de-pth

D. 'Normal d"flthLislll

1. Uniform flow

2. spdciftc energy

3. Minimum specil'ic energy

4. Same spocitic fareo

5. Some bed slope

A B c D

•• 3 5 ·I 2

b. 2 J l 3



w w

w . e x a

m r a c e

. c o m

57.

58.

59.

60.

61.

c. 3 2

d. j 4 1 2

A •10 nun diomeler 2m long straightuniform pipe c : : u r ~ -a .steady llow o f : ~ t e r(visoos[ty 1 .()1 centipoi.sesl the r ~ t e of

3.0 l i t e • ~ pot· minute. Wbn t is th11

:approxlrnn le valu" of the. shear strC..'i!i on

th" intllm• l wa ll of the pipe'!<t 0.0166 d y n e , c r n ~1>. jl,0812 dyne!em'

c. 8.12 dyn «icon'

rL 0.9931 dynC>cm2

Whicl1 one of the foUow ing is the Cflu'cd

expression for the area of now fur "circul;u· channel? !Where !l = ha lf theanglo subten<lcd by Water surface Ql tl"'.J<:nlre and R ; r u d i of tho circJJI3tchnru>el)

II . n>(2f) sin22(J )

b. R'(fl sin218 )

;:.. 2R'(2tl-s in211)

d. 2R2 (!)-sin 26)

A 1.0 m long model ofa ship is towed at •speed pf81 cm /s in a towing tn.nk. To wb>t

speed of the •hip, 64m long does this

COITe<flond to'ln, 7,2(\ mls

b. 6.48 m/s

c. $.76 rn/s

d. 3.60 m/s

In • Oow condition w h ~ • c bo!IJ viscous unogrovity force• dominnt" nnd both theFroude numOO.. and the Reynolds numher

~ ~ r e the m in m I and prototy pe: and,the ratio of kinematic viscosity afmodd totlu t of tho prototype is U.089.l .What l ; the

modela_. I : ~h. 3 : I

c. 5 : I

d I : 5

i \ ohip whose full lengtb is 100 rn is totmvel at 10 m1s Por dynamlc similarity.\vith what velocity sht)uld • I : 25 m(Kld

ofU1" sb.ip be tow ed?

n. 2 lOIS

I l l.

611.

liS.

8ll l l (>

b. J()ms

c. 25 m!5

d. 250 rn/s

Mllllh L i ~ L T (Type uf Model) lvilh . L i ~ t l

Transt(:rence R11t n fur Velt)Cil)' ) and selec.

correct """"cr;List I

A. R e ~ 1 1 o l d • model

B. Froude model

C. \Vebc'f modul

D. Mltcb model

Li•t. u..[/[r;

'2. J•. (p,l, )

3. I I I (p,/, )

4. >Jg),

(where symbols g, IL p. a and k hav<> U1eir

usu•l mc•uings and subscript r ' l'ofen to

the ratio)Codes;

A.

b.

d.

A

3

3

2

2

13

4

4

c2

2

3

3

D

4

1

4

I

Au oircr:rO i• flying at a speed of km /11at au altitude. "bere tit<> allnusphtoric

m p ~ ' f > I W is - 20"C. \ \ ~ u t os OreDf>proximatevalue of tl1e !Yfaoh numbeq,f

the aircraft?

a. 0.653

b. 0.697

c. 0.2411

d. 0.231

Jn a parfoct gas hav ing ratio of spcciJich e ~ t ·

os lA whnl ;, the s trength of •nunnal shi)Ck with upstt'e!lm t v t : . ~ 1 numbercqWl l tO 5.o7

• . 27

b. 2ti

c. 29

d. 24

Which one oF the li>llowing sllltement.s is

r-,levatll to Ute spe.:ific speed of acentrifugal pump?



w w

w . e x a

m r a c e

. c o m

6.

67.

68.

69.

n. rlcod developed is unity disc-harge

is unity

b. Hei!d developed l• unity and powerab:.orbi:<l is unity

c. Discharge is uni\Y ond power absorbedis unity

< E:lclt ol' he•d ikvelol)ed, power

a b ~ o r b e d lind d i : ! ~ h • r g e is equal to

unit)'

A ceuttifug•l pump needs 1000 W of

power when opera tmg nt 1500 rpm . Whnt1s the power r e q u i r e m ~ - n t if the ~ p e e d ol'the pump is iJtc't'eascd to 3()00 rpm?

... 2000 wb. 4000 w~ 65Utl w

"· snoo wl'wo centrifug"l pomp< hRve unpellers

with oulc:l' dimensions uf 02ch e4ual to

twice the inntr dinu.·-n.sious. 1"11c iru1cr

diameter of the ~ e c o impeller is threetimes the inner diomaer & the urst one.

What is llae speod rotio NyN1 of pump>. i f

tho pumps art n:qulred to develop the

••m e man metric hoad to Stnrt delivery of

\\ater'?

9

b. 4

c. 112

d. 1'3

W nler required to be lifted by J I() k\\'

pump fr(>m a depth of lUll m. If the pwnp

is U>t>b)e t11 lift th<: wnter. Oaen wlticb one

ofU1e lollowing is c o r r e oa, A greatm oop3cily pomp hl1lll0 b< usdd

b. A l a g ~ r diometet· ddivery pip<> bus to

he used

c.. A !urger di:uuoter suctiuu pap< has tohe used

cL J\ rnuhi$tnge puinp Ito. to be us<:<lWhich one ofOao following is coa.w.t?

In positive dlsploC<.>monl pump.-. the slipcan !iometimcs be negativewhen the actunl

discharge is greater than the theoreti.cal

disclwrge. This happens in

n. small t i r l n pipes ctoupled with a IO\\

d ~ l i v c r hcntl

h. smnll suction pipe$ coupk<tl With a

mcdiutu deljvery her.ul

70,

71.

72.

73.

74.

? ol Iii

c. long suctlon pipCII ' coupled willa lowdeliveo• heod

d. long <uction pipes coupled with

medium de liwry

A cenlrifugol pump o p e r ~ t i n g ot 1()0(1 rpm

o head of 30 m. If he s peed r.incrcnscd to 2000 rpm and th.: pnmp

opera ies with the same efficiency. what isthe"""" developed by the pump'/

la. 60 m

b. 90m

c. 120 Il l

d. 150 I l l

What i5 Ou' rangu of the spt.'<'d 1'11tio 9 for

Knplan turbine for its most efticfentoperntion'l

a. 0.10 " ' 0 .30

h 0,43 toO 65

c. O.S5 to 1.20

d. 1..1(1 to 2. )O

Mnt<:h List I ('I ypc ofModel) with List Jl(Liqoid Handled) and •elect the' cmTeclauswer:

List I

A. Closed impel!.,.- pUtnJ'

n. Sem i-open imtleller pmnp

(' Open im peller pump

List D

1. S>ndy watea·

2. .\cids

3. S ~ \ l ~ wa ter

Codes:

A B c

•• '" 2

b. · 2

c. 2 3

d. 1 2 ·

An impulse turbine npc'roting with" s ingleno7.zk h"S " ~ p e c i a l sp<:<:d of 5. \Vhat "i l l

be the apjli'OXimule i f i t SjiCt-d or Ote

turbine if the turbine is oper:<teci with one

moreadditiona l nozzle oftlte me size'/

j l, 4

b. 6

r:. 7

d. to

Two centrifugal pump• 'A ' nod ·n·opcn1te at their m::.ximu-m c f : l i o i e n c i ~ at



w w

w . e x a

m r a c e

. c o m

1000 rpm 500 rpm respectively.Against the s ~ m e delivery h ~ d pump 'A 'diselmge I m1/s and p11mp B t ! L ~ c 4

t<:of1CC1ivd)•. Wh:tl is Uo c ratio of

e c i f > e •pe<.'ll• (N, ), · (N, )a?

" · I : '2b. 1 ; 1

~ 1: 4d. 4 : 1

75. W.tl (Specific Spc-..d) wiUt Li•t II(Expr<lllsioo ' nwgui tud c) and selectco rrect :a.•uwer·

7( ),

List !

A. Spec ific •reednf tmbinc

B. Spec ific spcud ofpump

C. Specific speod of pelton wbool

D. Specific $J)Ctd o f F r • n c i ~ turbine

List UI. N../Q IH"2. N../PIH".· . 50 - 25U

4. II) .5()

Code..:

A B c D

.. J 2

b. 3 2 1 4

2 I 4 3d. 2 3

Which of the following pairscorrt!etly m < ~ t h c t t

is not

o. Centrifugal pump : Rotating blodes luthe motor centrifug:tl head

b. R ~ - c i p r O < : l l l i n g pump: Po•ftivc

displocc'ment pump

c. 'f11rbine pwnp : Cerotrifugal pump with

guide vnnes

<L Gear pnmp : Gear Ieeth work like

tOI.1 ting blades to c r e a cenui.fugalhCDd

77. 1\latch Li<t I (Flow Pa.rumeier) wiUI List U(Type of Turbine) I!Itd scloot lbc ~ r r e o tanswer:

List I

A. Highhc-ad

B. A.xiol flow

C. M.i$cd fl nw

D. Higb sp...::ifio s p < ~ ~ : d

78.

10 ul I ll

List U

I. Francis turb ine

2c Pol ton wheel

"· Kaplan turbine

Codes:

A B c Da. 2

3 I

b. 2 3 2

c. 2 '·''"

d. 2 2

'lrich one of the to!low ing statements isCOrr<'<!t'l

When a tluid passes (Tom the in let to exitof t'Oior in a. centrifugal pump,tangential mom en tum

a. incrcas_...s and o - n c r g increases

b. doorea.s.:s and eno,rgy i n c n o a ~ c : ; ;

""n:mJ:ains w t c h t m g ~ t . l and cn<rgy

d., . . . . .

d. IUCrCOLSCS •ud energy 1\.11\atn.s

unchanged

79. A Frun cio turbine COUJIIcd lu ""

altemator to electricity with a

frettuoncy of O H ~ IJ'Oo <o alternator has t2pole:;;. then tile Ultbinc •bould be tegulntul

to run at whtch one of the followingconstant speeds'/

80.

81.

a. 250 rpm

b. 5()(1 rpm

c. 600 rpm

d. \0()() ! ] lUI

CooL•idcr the !lollo•vuog •lnlemoniJ!regarding waste he.o l boilers

I. Wostc -heot boil= placed in th O> pathof exhaust gases

2 These are frre tube boiler\!

3. Tha r e ~ ~ t e r portion of he heat ll'ilnsferin •uch boiler• is due 10 C() nveetion

\V1rich of the statements glven abnve are

con·ecl'l

a. I. 2 and 3

b. I and 2

c. l a nd 3

d. I and 3

C<>n•icler tho tbllowing stntemcnllil'e!t:lrdlng performanceor turbojet engineS



w w

w . e x a

m r a c e

. c o m

J. The tbrusl decreases. ot hig,her a hitudodue to reduced demiry of nnd

o o n ~ e q u c n t 1 y lnwc::r mass Ou\Yot'air.

2. At subsonic speeds. tlte effect of

incrctucd o c i l ~ • is to t c a ~ . . : the air

flow nnd lhn1st iucfeil•e•

3. The-rdolivc velocity of ot with respect

to the medium decreases at higherspeeds which tends lo reduce lhe thntSt

-1. For turbl)jct engine the chrust of. jetsubS<Jnic •pecds rotnJtins relatiVely

c o o s t n n 1 . ~Whic.h of the t a t c r u c u l . $ 11hovc arc

correct'?

a. 1.2. 3 nnd •l

b. I and 3

.:. I. 2 and 4

d. 2..3 311d 4

82. Co ns ider the followin g. t ; t l ~ m for

NOx rmtis-sions from LC. n g U u . ~I . Foonolion of NO.. depends upoll

co mbustion lempemlure

2. Formation of NO dcpc'tlds UIMIII type of

coolant. used

3. 1:..'1\hn-ost gas n . . ~ i r c u i : J t i o n iS- an

effective. rneans for control ofNO,

4. Activ•ted Plntinum is used t{Jr

1eduotion of NO .

Which i lf the statements ght.11 ob"'"' arccorrcc-1'?

n. I nnd 2

b. I. 2 ond 3

1! . 2 nnd -1·

d. I nnd 3

Consider the folio" ing m e n Exhansten1issious of e:ubott monoxide from spa1'k

ignition cnginu arc.

J. 111aiu.Jy fuul- aiv tu.ixlure strengthdependent

2. in the rouge ofzero tu t o ~ •3. nn:asurod with the help of an

in•trumonl working on the princ.iplo of

non- dispetSive rnfm_,..,d a11alysis

•1. c<>ntrolled by the use of a two woyc:atalytk conve rtor

Which of tho m gi'lcn above arce o r r ~ ?11. I and 4

b h nd 3

1 I of I6

c. land3

d. 1, 2, 3 and 4

84, Which one of tho following order . is the

c.on·ect order of pa"5ing lhe flue _gases

through the diffe1'011l absorbents (in theflttSks ) during ;malysi$ in Orsat apparatus'?

• . l ; t . ' < i ~ t m hydrol'id.c solution

a l k n l i n ~ $Olntio,; of pyrogallio ocid -cuprou• chloride solution

b. PotD.SSium hydroxide solutioneupro\IS chloride soluhon - ~ - : &solution of pyrogallic aeid

c, Alkaline l u l i of py rogn llic acid -cuprou:! o r i d ~ solution - potassiu111

hydro.'<id" so lntion

d. C u l ' r o ~ chloride so lutionpotass1om hydroxide solutionalka line solution of pyrOj!aUic acid

85. An engine using OCl3no- oir mi xrure ho.<N:. O, CO;:. CO and H,O as oonslilucnlsin the cl<!taust gns. \Vltich one of tlte

following can be conclud ed?

:t. Supply l ' l : is •toichiomet•ic

b. Supply ml:<turc hos incompletem b u ~ t i o n

c. Supply mixture is rich

d. Supply mixmrc is ICZtn

86. Which one of the following statements U.

87.

COmlCt'/

ln CANDU type nucle:u reactor

a. nufurnl uranium js used :1.$ fuel :md

wnter ns moderalt>r

h. nnll1r•l urnnjnm is ;Is fu¢1 ;m(l

ht::1vy walc:r as !il tKierulqr

c. enriched urnninm is used as lirel and

w:s ter as m d ~ u t o rd. enriched urnrtium i.• ltsecl as fu el and

h*-'UVJ wa ter ns mod.:ralor

Mtttdt List I (Mn terinl) with L i ~ t ll

t A p p l i C < ~ t i o n )kind •elect the com.:cl

List l

A. Plutonium- 239

B. TIJOrium - 232

C. Codmium

D. Oruphitc

List IT

I. F<:t1ilc m11Lcrial

2. Control cods



w w

w . e x a

m r a c e

. c o m

8.

89.

90.

1/ I.

3. Modcrwor

Fissile mate rial

Codes:

a.

b.

c:.

d.

A

"1

4

B

3

J

c2

-1

2

D

I

1

IJ

Which nne nr the li>llowing Slalelli<>IIIS isu . c l ' ?

The curve for unslCad) stmc coo ling or

healingor bodies is

a parabolic cun•o asymptotic to lime axb

h. exponential curve asymp1otio to timeu..xis

c. "'JI(Inenlial curve asymptolic roth lc>

time and tCJnpermurea.,is

J. Hyperbolic curve a•yrnplolk b<>th totintc and t e m p < : r c a , i s

What will be the goome tric radius of' heat

trunsfer lbr a ho llow sphere of innor andvutcr rudii q tuu..l r1?a. [rl;;

b. r,r2

c. r, I t,

d. (r, -r,)

1\ ct)ll'I()I>Si tc Willi is moJe <lf' tWtl IUycrS u rthickness 5o and o, having thermalct•ndu ctivc K and 2K and equal surfuccat'llas normal to direction of heat llow.The outer surfaces of the composite wa llarc at IOO "C and 2oo•c rcspecliwly. The

heat transti:r takes place only h)·conduction lmd the required surtllcctempenoture at the Junction is 150• C.What will be the ratio of their thicknesses

s, : ih?

a.I : I

h. 2

c. I : 2

J. 2 J

1 hc111c1" pipe of I m <>uter diameter i> tc>

"c insulated thick C) lindrical insulationhaving 1hennal conductil'ity I W/mk. The

surface hea t tmnsfer "'":mclent on theinsulation surface is 5 W m ; What is theminimum enective lhiclmess tit' immlotinu

92.

93.

12 otltl

ior cuusing. U1c reduction in h ~ a i Jeabgclrom 01e hJsulalcd pipt'?

a. IOcm

b. 15 em

C. 19.5 Cn1

d. 2fl em

Match Lisl I (Ileal Excban,ger Process)

with LisL II (I cuop.:ruture /\rea Diagram)and select 1he et>rrect a n s w e r ~List I

A. Counter 1101' S < ' n ~ i b l e heating

B . Parallel llO\\ sensi>le ltetuing

C. Exaporating.

D. Ccmdcnsing

Lis LII

1.

1.

J. T ~4.

5.

Codes:

•T ~~A c:

n. 3

ll

II

2.

c.

d.

J

4

4

J

2

5

2

I>

2

I

5

5

Nusset munber for a pipe l111w heat

lrans ter cocllicienl is gh-cn by the



w w

w . e x a

m r a c e

. c o m4

1)5.

%.

cqu.1tion Nuo : 4.36. Whic.h one ol' the

lilllowing combinations of conditions docsnctly upply ltl f U!!c of C<jUotion?

L:1minar now and ~ t t ~ n t wa lltempera ure

b. T u l ~ n now and constant waU ben tnux.

.:. Turbulent tlow aud const>ul w•Utemperature

d. Lamiuar now conslanl wa ll h c t ~ tOux

l\latch List I <Prooess) with L.ist II

(Predominant Parameter Associated with

th<> Plow) and seloi:L the cOJrecta nswee

List!

/\ , Tr>nsienl conduction

8. Mass transfer

(" . Forced convection

0. l"ree . m v e c ~ i oLl$lll

I. Shenl'ood Number

2. l\l:tch Nurrther

3. Bjut Numb0r

GroshofNumbcr

.5. Reynold.> numbot

n.h.

c.

d

A B

J

,_

c

s25

2

D

45

4

5

Which one of tile following statement< i;com:c1? 'fhe non- c limcnsion.•l p a r a m ~known as Stanton numbb1' (SI) i< Wjtod in

n. forcc'tl cvnvc:ction heot lrllnsfer- in flo11over ilat plow

b. e < ~ n d e n s heal lmnsfcr with

laminar iilm loyer

c. nutural C(lnvec tj (Ul h c ~ 1 t fJ':t.n !fll;.'f (}VCr

fht plole

d. ltc:31 traru;fer fmm bodie< in

wiUch intema l lempOfature gr.ulienl!;c.mnot be nt:glectcd

ln a convective he.11 11ansfer situation

Reynolds number i• very lrugo but lltoPrnndtl number is so •mnU tltat tlte productRe Pr io ~ s lhon one. ln ..uch

condilivn l ~ h i c h one l) f tltc fo llowing ; ,

r . r c c ~ ?

97.

98.

13 ul 16

a. 11tennal boundary 1.\yer docs not e)(is[

b. V3cou• boundary Ioyer thickness ;.

less lhao Ute l.hermal bounduy layertltickn.oss

c. Vi.<«ous boundary layer thickness Is

cqll11l to the ~ n n a l boundill')' Ioyer

th ickness

d. \ " ~ C O i l $ boun.dary layer thkklless ;,.greater than Ihe lhamnl boundnry layerthickncn

Ma tch l.ist l (Surface 1vith Orienltltions)with List 1l (Equiv.llon t E m i s ~ i andselect the c.untel Jl l l'l'\\lcr.

List rA ln fmi le pot:tllcl planes

13. Body I cmnpktcl) enc l<><t:d hy body 2

b ut body I iJ very -mall

C. Radiation llltCbnngc bo lw ee11 two srunU

gr3y bodie5

D . Two concentric cylindct•s wi th l:trgc

length$

E. L3t rr

I. "•

2._1_ _1 - 1

.::, - 1

3.1

~ ~ ~ -t)4. ~ - = - ~

o d e s;\ B ( ' 0

;.. 3 4 2

b. 2 4 l,,

c. 2 1 4 3

d. 3 4 2

Two • P"""" ' :\ :nul B u f same m•h:.<i31

have r3dii l m and 4m and Wmperaturc-

4000 K • od 2000 K respectively. Which

one of he fo llowing s tnlcments is con-cct'l

The energy radiated by sphere A is

a. greotor than that orsphtrc 13

h. l e s ~ th•n dtal or phere R

c. eqn•l (o that ofsphere B

d. cqllll l to double lhnt ofsph.:re B



w w

w . e x a

m r a c e

. c o m

9?. For n opaque plane surface the irradimion.mdiosity and emissive power arerespectively 20, 12 and I () W/m1

.

What is the emissivity of the su rface?

a. 0.2

b. OA

c. 0.8

d. 1.0

I00. Two long parallel st•rf'aces. each of

emissivity 0.7 are ma intained at differenttempemlurcs and accordingly hnvc

radiation exchange between them. It isdesired I l l reduce 75% of th is radiant heat

lrunsfe.r hy inserting tl>in parallel shields ofemissivity (0,7) on both sides, \Vh:u

W•luld be the number of shidJs'?

a.

b. 2

c. 3

d. 4

I01. The earth rece ives at its surface radist ionrrom the sun at the ra te of 1400 W m The

distance of ccmre of sun li'om the surlace

of earth is 1.5 • I011

" ' and the radius of

sun is 7.0 • 108 m. \\lh;tl. is approximately

the surf.1ce temiJCrature of sun treatingthe su11as" black boo y?

102.

a. 36)0 K

b. 4500 K

c. 5800

d. 6150 K

' 2 •

4

Whm is the va lue of the shape fac tor F,l Tna cylindricat cavity of diameter d andheight h IJCLWccn b<ltl<lni fuc.o known a>

surface I and top llnt surface known assurt3ce 2'?

2/sa. - - -

h+t l

b.tl

d+4h

103 .

14 ur to

c.4d

4tl+h

d.2d--J -t"h

A hemispberical surface I lie;; over u

horizonUII plane SUI•facc 2 such thatconve.x ponlon of the hemisphere Is facing

sky. Whal is the value of the geometricalshape titctor'l

a. 1/4

b. 112

c. 3/4

d. 1/R

I04. A heal en wllh 30% officicncy drives ardrigerntor ol' COP. 5.0. What wou ld bethe net heal inpu1 to •he engine lor each

MIV of heat removed inlhc ~ e n u o r ?3 . 66 67 kJ

h. (>()() kJ

c. 666.671..J

d.. 6600 !(.)

I05. Mercury- water m;mumctcr bas u gaugedifference ol' 500 mm (dfflerence in

elevutfon (II' menisci). What will be thediQC!rence irt pressur(}'!

I06.

a, 0.5 m

b. 6.3 m

c. 6.8 m

d. 7.3' m

The bu lancing column sllown in 1he above

diagram conwinS 3 I quitls or dW'c renl

densities f' l, r 2 and p, . The liqu id lc\·cl ofone Limb is hI below d1e top level and



w w

w . e x a

m r a c e

. c o m

there i t n dtft'erencc of h relative to that inthe other lrmb .

What willl>e lhe expres., ion fo r h?

a. P, f! ,

t\ p.,

b p, - p, 1

- p,

\! . !!J 6 IIp, -

1l 1>. - p, 1\

p,

107. A circular annulat· plate oounded b)• two

concentric- circ les of diamoler 1.2 111 and

() 8 m is immersed ln wa ter will• its planemaking nn angle ttf 45" with thehooizonUtl. 'Dtc centre of tbe ciJd"" is

1.625 m bdo11 the froc surf11ce. Wltal willbe the tfttal pressure forc.e on the t'uee of

l.bc 11l•te?

a. 7.07 kN

b. I0.00 kl'J

14. 14 kN

d. 18.01) 1111

W8 . A plate of rcclllngular shape having tltodimensions of 0.4 m x 0.6 m is immersed

in \\aler with ils longer side \'etticat Thetotal bydrosllltic thrust on one •ide of lh"

plltc is estimated n• 18. > kN. i\11 o th...conditions remaining the same. the plate is

turned thi'Ough 9()0 such t l • ~ l tts IQngeo· sid<>

remain• \'eoticoL \\ h:Lt would l>c tltc totalLm .JC on one fa ceof the pbte?

a. 9.15 kN

b. 18-3 kN

c.. 36.6 kN

d. 12..2 .kN

I09. An open reconngulat bo:< of bm;e 2m ' 2m

contains • liquid of speci.Uc go'llvity 0.80

up to a height of 2.5m. If lhe box l•imparted n vo:rlicall y upwnrd o c c . e l r n t ivf 4.9 m/s2

• wllul \Yill tbc ' e s s 1111 th"

bn•c of tloe t;mk-.7

tl . 9.81 kP•

b.

c. 3(t..S0kPa

d. 29.40 kP•

110. A constml-heod water tank has. on one

of iL• 1c'tti0<11 • ide. two idcnt.ical •mell

IS nl 16

oriliees issuing tw n ltorizont;ol je4 in the

some vertical plane. 'J'he vertico l disillncchell• en the coo le-n< or o r i ( i < > e . ~ is I .s mnod the> je t l r o j c c t o r i illl""!CCt •t u 110iot

0.5 m be low the lower orifice. What i.< the

approximutt height ot' water level in fh tt:11nk ab<wc Ott: point ()f intefflection oflrojccrorie,?

u. I.Oon

b. 25 m

c. 0.5 111

d. 2.0 m

I l l . Th e components of velocity ill a. twodimcll.•ion•l frictionless luoomprcssible,

n o w are- u t1 +3y 3nd V -: 3t f. 3x.. \Vh:at Is

Ute •tlrroximate resultant total accelerationat the poittl (3. 2) and 1= 'l

a. ;

b .19c. 5'1

d. 54

112. '11tc t r e t ~ m function = x' / is

ol>serve<l for a two dimansional tlow lic.ld.

What is the magmlude of lhe velocity atpoint ( I. -1)?

• . 4.24

b. 2 . ~ 3c. ()

d. H ~J Which one uf the i t l l ~ w i n g st11tements is

con·ct"t!l

Jrrogati omtl !low is chardti<O rizeJ as lloe

ouo in which

a. the 11uitl flows olong • i>lr•ighl fuo c

b. the fluid does nclt r<Jtstc as i1 mO\csnlung

c. tho no! ~ t a t i u n of fluid pnrtid,z aboutUu:ir rn.ils..'i cc-nhm'i rerha in.s u.JI"t'

d. the s-tre:rml.im.S of fl<mt nro cw-v ..tl and

closely •pacod

114 . A 20 em dinmctcr 500 m long wa ter ripewith fi'iclion f a c t o r · ~ = ()()25. leads li'om acqru;tant·hcnd reservoir nod tcnninatcs Ill

Ute delivco-y end into It nozzle dbciLotging

intn air. (Negloot all energy loss<lli othertltan tltose due to pipe friction). What is

the approxirnnk diarocter of tl1o jet for

maximum power''

• . 6.67 111111

b. 5,98 111111



w w

w . e x a

m r a c e

. c o m

c. 66 .7mm

d. 59.Mmm

115. Which of he following functions represent

the velocity po tential in 3 two-dimensionJI

tlow of •n ideal flu id'/

I +' .

. 4x- - 3y-

COS (X • y)

-1. lan 1 (xlyl

Sel.:ct UJc com:ct on.•wcr u.sillg the

given helo\\

n. I nnd 3

b l nod 4

c.. 2 nod 3

d. 2nnd 4

116. pressure drop fot n rulolively lollReynolds number flow in o 600 mm, 30m

long pipe line is 70 I;Pa. \Vhnt is the wa llsbear slre•s 'l

o. () PA

b. Pll

c. 700 Pa

d. 1400 Pa

117. A pitot- • latic tune (f ' : I) i.< u•cd to

m e a s u r ~ atr With wa ter in the

diUbrentia l manometer and n gouge

deterrence of 75 nun. whol u Ute val ue of

nir if p 1 16 kgim-'?

n, 1,2 1 rnls

b. 16.2 ml•

c. 5.6

cl 71.2 m118. Match List 1 ( l - . l ~ s u r l n .Dcvic<'S) with

List U (Measured Poramctcr) ond se lec t

the correct nnswer using th e code• given

below:

I ist I

A. Pilot tube

~ Micr<>-·manometer

(' Pipe bend meter

D. W•llpres.o;ure lap

Listll

I. Flim sb tic prtssur.:

2. RMe of Dow <lndiroct)

3. Dillcrcnliol pressw·c

I Il l

4. Flow sillgnation pressure

Codos:

B c D

~ 3 2 4

b. 4 3 2 1

~ 2 3 4

d. 4 2 3 I

l l>ul l ll

M>tch L i ~ L I (Variobles in L:uninnrBoundary L•ver F low over a FbLP iatc Set

P a r ~ l l • l ·to Sh-c•ml " ~ l b Li!it nl ~ l e d fu< pression with usual notation>

and select the com;ct ~ W ~ ' f t•s ing th e

l.!odt:S giveo h c l t n ~List rA Boun<lary layer t.hickness

B. .-\ o r a g ~ ~ l s . i n - - ( r coeflicic:nt

C. Shear stress at boundarv

Q. Displncementth icknessl. i$t ll

I. l .n9 1../Ur ,.

2 0332p(. ' 1 .Jux1,.

51·h x1U

4. 0.864./ .•1U.t

5. 1.32H I ./UU r

Codes:

A B

ca. 3 5 4

b. 2 4 I

c. 3 5 2

d. 5 4

D

2

3

J

2

120. A (Jot plate, 2m U,4m ' ' parallel to aunifonu stre:am of ;ttr (densil) L2kg/m'and visco>ily 16 ccnti5Lokes) wltl1 itsshoner edges along lhe now. 111eve l.ocity is 30 km/h. What is th e

approximate a t t : d th ic.kncs• of

boundary b yor nt Uw. duwnstr<:nm end orthe plate?

•• 1.96 TTITTI

b. 438 mm

c. 13.12 mm

d. 9.51 nun

ies mechanical engineering paper 1 2004

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