ies mechanical engineering paper 1 2003

7/27/2019 IES Mechanical Engineering Paper 1 2003

http://slidepdf.com/reader/full/ies-mechanical-engineering-paper-1-2003 1/16

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j t.E.S-{0 RJ) lOOl I ol J6

I MECHANICAL ENGINEERING J~ - = = = = = = = . ;

, _

2.

3.

PAPER-IConstder tlte follow1og statementspertaining to bounda ry layer :

I. B o u n d layer is a thin layer adjacemlo the boundary wbere maximum

viscous energy diss ipation takes place.

2. Bmmdary layer tluckness is a thicknessby the ideal now is shifted .

3 Separation of ~ layer is causedb) presence of adverse pressure

gradient

Which of these statements are correct'/

a. L2and3

b. l and 2

c. I and 3

d. 2$ td 3

Tbe ve locitv prolile for r u r b u l e n e r o v e ra na1 piale is

a. ~ = s m - Lu 2 i i

( )

i'"'

b.

:>c. ~ ~ rd % ( ~ ~ ( ~ ) 'Match List I (flows Over or tns tde the

Systems) with List ll (Type of Flow) nndselect the correct answer ·

List I

A.. Flow over a sphereB. Flow over a loog cy Under

C. Flow m a ptpe bend

D Fully developed flow in a ptpe atconstant flow rate

List n

I . Two dtmensionaJ flow

2 One dimensional flow

3 Axis symmetric flow

4 Three dimens1onal flow

4.

5

A B c D

a. 3 2 4

b. 3 2

c. 3 I 4 2

d. 4 2 3

Cons ider the followmg statements:

1 Dimensional analysis is used 10

determine the number of vanablesinvolved m a certain phenomenon.

2. TI1e group of repeating variables in

dimensional is should Include all 1hefund ;unental units.

3. Buckingham's Jt theorem stipula tes thenumber of dimensionless groups fo r agtven phenomenon.

4. The coefficient in Chezy 's equationhas no dimension

Which of these arecorrect ?

a. 1,2,3 and4

b. 2, 3 and 4

c. I and 4

d. 2 and 3

Match List I (Flow/Wave) w1th List. II(D imensionless Number) nnd select thecorrect answer

List !

A. Cap illary waves on channel

B. Testing ol'aerofo1ls

C Flow around bn dge piers

D. Turb ulent flow through pipes

List II

J Reynolds muuber

2. Froud nu mber

3, Weber nu mber

4. Euler number

5. Mach number

A B c D

a. 5 4 3 2

b. 3 5 4

c. 5 4 2



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6,

7,

9.

d. • 5 2

Cqnside:r the following stntem.,nls ·

l . Complete s tmilatil) bct\ \ocn modo!and prototype envis :.tg-es geometric and

dynamic simil:uities only

2. Di<torted m aro necessary where

geometric &intiJar ity is not p(tSSihlo due

lo practkul roosOO$.3. In ~ l i n g of model of ship.

surfal'C tctl$ion forces tore genoro lly

negleclod.

•1. The •cafe el fect takes c•re of the efteotof dissimilarity bet\v..en model and

yWhich of theses tatements nrecom:cl l

"· lund 3

b. l. 2 and 4

c 2 30d 3

cl 2and4

l'he flu id property tha1 remoins unch•nged

th.:ros.o;: tt norma l waYo

n. Slagnal too ...,lh• lpy

h. S·tagnation pressure

c, St:ol c prt:ssure

d. Mass density

l\'lotoh List 1 (Pltcnotncon) with List 11

(C'auses)and sclcc l the <><>rrect <nswer •

r(\ , Shock w iJVe

B. fllow separa14<>n

C"- V CJpillory r i•c

D. Cnvitalion

Li.t U

1. Surf•cc: ~ i o n2. V llj)OUI' i ' I : S ~3. ( 'umpress ibility

4. A1lverse pre•sure MA B l '

"· - 2

b. 4 2

c. 3 4

d. 4 1 1

I)

4.

3

2

3

CoMidcr lbo following slatemcntJ;

pertaining to one---d imcnsion.1f is.enlropiotlow in • convergent-divergent pass•ge:

I A convergent-diverg<mt possoge mo y

function tts ;t SU(>t:rsonlt: nc..a.lc ur t1

venlllrl depending

pressure.

lo f 16

nn the back

2. At the throat, sonic c ond itions <:;(tSI fo r

subson ic or supersonic flow al

outlet.

3. A s upersonic nozzle dlsch• rgus fluid at

c.onstnnt n tc even if the a il pressure is

lower than the de• isn p""'sure4. A nonnill $)We-.. upp<:ar. in the

f ! . i section ol the noa l" if the

prcssuoO os nho,•e the oesignpressure but bclo-« a certa in minim nm

pressure for ventur i operation,

Which ofibe .,t ltemenls :ore correct?

•• 1, 2, 3 and 4

I. 3 and 4

c, 2. 3 Md4

d. I and 2

Ill. 1'wo pd too wheels A andB h>ve s>m<>

specific spoecl ood ru·c wo rking under, the

s•me bead. When A produce$ k\V al

I0\10 rpm . If B produces I1\0 k\V. U1en itsll'm i;.

• • 4000

h 2iXJil

c. I 5Uu

d. 1250

I I. Un the assumption thnt a double suct ion

impeller is the c<tuiva lcnlM

tl•o single•uction impellers pl"ccd htu:k to bad<, it is

to base tl1c •pocilic •peed of the

double •uction pumr on

"· Oo.e )lolfof d1e tn tltl cnp'ncity

b. Three fourth ofi·he 1otnlo.-.1pocily

c. Fulllnlal CllpDcity

d. Doub le the l.otol capacity

12 Cou.'lidcr the foUowirtg Lypcs of wull:r

lurbines

1. Bu.b

2. Franchi

3. Kop lon

4. Pelton

The ~ r r c c t s"')uence of Qrdt:r in which the

operolin&h""d dCl'fcosc; while dLveloping

lhe ••me power is

a. 4.2. 3. I

b. 1;2

c. 2, L. .s.3

d. I, 3, 2. 4



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13. March List I ('rype of Pumps) with US! II(Associated Fcn turcs) and ~ l l l c ~ t thecorrect an5\'·cr:

l, ist I

A. Centrifugal pump

B. Genr pump

l '. Reciprocating pump

D. Turbine pump

Lisl II

1. Ai r vessel

2. Drnfl mbe

J . Guide vanes

4. Rotary pump

5 Rotor htlVing bludcs

a,

b.c.

d.

A [) C'

5

2

42

4

J

3

2

I

J

1-1, Match I ist I (lndustriuJ Neodsl with Listll(l 'ype of Pump) and select tho correct

n n ~ \ l c r

15

Lis t I

A. Combustible fluid to be ptunped

B. High h c ~ d but ~ r n u l l dischurgc needed

C. l<ow bu l a r g ~ dischargd needed

D. High head and high ~ c h a r g e needed

List II

I . Single stage centrifugal

2. Mu lti-stage cc ntrilitgal

3 Positive displnccmcnt

-1. Jet pump

A B C D

a. 3 2 4

b 4 3 2

c. 3 I 4 2

d. . j 3 2Lou$idc.r the to llowing etwrgics as.wciutcd

with a Pelton turbine :

Mechanical energy

2. Kinetk ener!,')'

3. l'otcntial energy

The o r r c c scqncocc ol' energy conwrsit)ns t ~ r t i u g from the entry of fluid is

n. I, 2. 3

b 2. 3, I

16

17.

18

I I)

J o f lo

c. 3. 2, I

d. I. 3. 2

Euler equation of turbine giving cncr!;)

lmnsfer per unit muss Eu (where U. v V,and V represent rhe peripheral. \\hirl.n: lntivc and nbsolute velocities

r e s p e c t i v e ! ~ Sulli' I and 2 refe r to tbe

turbirw inlet and outlet r . : s p e ~ : l i v c l ) I isgiven by

u, E. , : UV ,, - u, V,.,

b. Eo¥ UoV,,- U1V,,

c. E., =u,v,- u, v,d. E.,= , v - V: v .,The power ratio of o pump und it$ 114 the.sc(rle mOde l, i f he ratio of Ihe heads is 5 ·I. \1 ill be

3 . 100

b. 3.2c. 179

d. 12.8

Wluch rn1c of the fo llowing. graphscorreclly represents the relations between

He11d and Speci!ie speed for Kap lan andFrnncis turhinc?

---r\ \. . ••

f f i " " t ~ "-.....

---U. $c«lfi.C I I)Hd -

Consider tho following statementsregarding air vessels provided in.rccipmcnting pump rnstallations



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21.

22

2:3.

I. TI1e •ir ves•els are fitted both em

suction and delivt:T)' ~ i d < - s2. 'l11e nir ve;sels are tilted far from the

!lUmp cylinder.

3 'l11e :.ir vessels s3ve energy by

t-.:ducing friction

Which of these ¢ m o n t . s are co!Tl'.;l"!

a, 2 a n d ~I> 2 ond 3

I and 2

<1. I and 3

A pump. is instnlled • height of 5 m

above the water level m .tl1e sump.Fricliono l loss on the suc.lion side;.., O.G m.

u· tho ntmospheric pros.uro is 10.3 m of

water and vnponr pre.<Sure head i• 0.4 m(abs). tl1e NPSH (Net Positive Suction

Head) "iU be

""Ul

b. 4m

e. 4 . II i

d. 4 .<J m

Priming i.'i neceSsary in

n, Cen1rifugal pumps lo lift wnl¢r i'r'Crm .1

grt:ater depth

b. C'enlrifl•gal pmnps tQ remove air in the

suction pipe :md casing

c. Ilydraulil! turbine lo remove all' m the

turbine cosingd . H)'d!1llllic turbine II) incl'tUse U1c SJ>ccd

of turbine and to gene·oate more110\\Cr

An o.ccumu l:ttc)l. is :J d<.·vice: to store

n. Sufficiunt qunntity of liquid tocomponsalo tho change in discharge

b, Sufficirmt energy to drive tht: macb ine

1vhen the nonnal enCfl!y ~ o u r c e does.

"''t function

c. Sut'ficienl energy in case of machinesW h i ~ h work intenuillL1Hiy tu

~ U J > p l c n t c n t the di•chorge f10111 thenonnal so1,1rce

d. Liquid which othorwi•e would h3\'Cgone lo waste

l'he draught in locomotive boilom is

produced by

u. Chimney

b. C'entril'ognll3n

c.. S t e : ~ m je td. L<)C<lmOtil>n

24.

25.

26.

27.

28.

.1nt I ,

ln a t w o · s l • g ~ compreuor with idealinleroooling. for tl1e wo rk requirement tobe minimum. tho olllermediatc ptc:!;sure PI

in lcnns of C.()ntk•nscl' :tnd cvapu1Mor

t>reit•11re p, nnol P• n:speclivcly is

a. PI = P<P.

b. p; ~ ~ J I , P ,c.. PI ../ii:P,

d. PI =Pt l p,

1n n onu ton c.ap.1clty WDlCr cooler_ wutCcT

enters •t 30"C at the rote of 2(10 liters per

hour. ' l11e ou tlet lempernture of' water •viii

b.: ( •P· h"'tt ofwat<O: 4.18 k.likg .K)

a. 3.5"C

b. 6YC

c. 23 .7"C

d. ts•cA refngeratOr working on n reversed

C'amot cycle h a s ~ C,O.P. or4.lf it work.•as boat pump and consutnes l kW, tbe

hOlllil\8 cfl(!<;l will be

u. l k\V

b. .tk\\'

c. 5k\V

d. 6kW

Theoretkal n1.1ximum r .n.P. of • vapourabsorption S)'stum (wl1cro. Tcr ~ ; . m « a t o rtemp. Ta ~ waporntor lcmp. To =environmenta l temp) is

.. ~ [ ~ : - ~ )b. , -

r r " - rc, ~ -

1' - 1,

cJ. ( ' ~ - r.)~ -When n refrigemtur sysl= h; shorted from

ambient conditioru, tho cv•porotorle:mper31Ure decreases from amblentlemper3lure to d e . ~ l g n V3.lue. This period is

kliOWII as • pull-down period. The powerroquircmrm! of compressor during pulldown

-a. decreasescontinuously

h1 i n c r e B ~ e s oontinuowly



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31

c. remains o n s t bd. Utcro:t.'es nod then decreases

Oil scporotor is NOT t•cquircd mrefri_ger.1lion sy!'lteru i f

'' ' e f r i g e • ~ n 1 :&nd vii arc imm iJ;cible all

rrcssun:s 1emperamn,g

II t'e f'ri8er:ml >nd oil : lte immiscible al

c1.mden_'"tion p r c s ~ u r . : ;lnd C 1 ! 1 p ~ r • t u r ec. refiiger:ml ond oi l are mi scihle at all

pn:ssu1" •nd temp<:.r•lurcs

tl tefd!lomnl Jnd oil ·"" miscible 111

conf.ft:nsntion P ' ' c s . . ~ ~ o u J ' O s t.utd

lcmpet'3h!re

U' !he volum e of m o i ~ t with : i O ~ ordlltive humidity iJ; lsolht;rm,Jiy reducedI l l half its nriginal VIJlume. lh1:11 rclotivt:humidity of moist au·bcaotiJC$

25°.,

b. 6 0 " ~c. 75%

d. ltKI0o\lihet> the wet and dry bulb t e m p e r a t u r e ~arc idc:ntical which of the furtowing

st.atementi iJrarc true''/

l. Alr is fully saturotod

2 01:\< (>oinL c : m p e r ~ l u t e i> reached

3. Humidity ratio ill uuily

4. Pllrlial pressure of vapour e< lomls totalp t ' l . . ' t i s w ~

Sclec.t U1e coo<:ct aooSWe> lhml the ""desg-iven below :

n. l ortly

b. loud 2

" ' 3 ood +d. 1.2.3aud4

Lu ;-t ooo ling tower Lhe sum of 13nge t l1d

approaclt is equal to twice U1c wot bulbdepression, 'l11<m

Dry bulb rempt"Tature is mean of wnt'crinlet lemper•ture •nd wei hulh

lempeo·ature

h Dry bulb te•'11'erotu"' •s m e ; ~ n of wateroutlot l.l:m1>.:n>Utrc and wt:t buihl<tm pc:roturo

o. \Votor lnl"t LL1npernittre i< mean of W')'

bulb temperature •nd wet bulblemperature

33 .

34.

35.

36.

5 .,, 16

d. Woter i n l ~ temperature is mean of

wn ler oulletlellipernmre nnd bulbtcmpcrttlu('c

Which of the fo llowing propertieslnctcMc(s) during sL'ru!ible ho.-lling of nlr-

wnter v:tpoll r i . . ~ nI. RC>lative humidity

2 Humidity r;uio-"· \V<Jt bulb t . e m p ~ r a l u r o4. ~ n U u t l p y of air-v11pour

m i ~ t u r c :Sclu.:t the cuttcct onswc1' IJom the e<><les

g ~ below:

a. l and2

b. 3 only

2nnd3

<L ~ a n d 4

Up<>n wbiclL of lbc following f>elot . duestha eftb:live tempt.:rnlure 101' Ltum.UI

comf011 depend?

1. Dry bulb lornpenlllfe

2 Hounidity ratil>

3. Air w l<>city

4. Mean rndiation m p , , r n l U r cSd""t tho corro:<:t nnswcr fmm code>

given below :

" · 1and 2b. L 3 and 4

c. 2, 3 and 4

d. I, 2. Hnd 4

Molst air enters the cooltng eol l with m:m

Dow rntu of 10 kgdn!s nt dry bu lb

lemperoturc of JO"C nnd humidity rotio of

ll.O l7 kgwlkgdn . ll leaves the cooling coil

•t dry bulb temper31Wll of J6°C and

humidity r• tio of 0.008 kgwlkgda. l fspecific heM of humid afr is 1.02 k g d ~ K and latent heat ul' water vapour 2500kJ!I(gw. 'Jllc •cnsiblc <uld lnt< .nl hlllltLrnnsfcr of cooling cui) :u·c_, t t : s p ~ v c : l ~o. 140 kW and 25000 kW

b. 1428 kW nod 2. 2.5 kW

c 1428 kw and m kV."

d. 225 kW and 1428 kW

An air..:onditioned room bas length. widthand height of 20 ut, 30 m ond 4 m

respectively. The inftltnt.ion is 3$!"umud L

he one ch.1nge. l'h" 01rtdoor ond indoQr

dt'Y bulb temperatures "" ' 40°C and 25'"C



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38'.

respectively. 1ltc e n s i l > l e be:.t lood due to

lnJi llration is

n. 734 k W (b) 12.24 kW

h. 0.204 k\V (d) 10 kW

Consider the following m o n ~ in

rt' l J><et of the contractiQn and e><llllns ion

in. 3ir conditioning ~ u c t :

I . - . : ~ $ W ' C drop iJ; uono-e in cQntroctiQn

lh•u in c><ll31t'lion.

2. Pn.;ssurt:- drop is more iu I.!Xpansiou

Lhau in canu:acliqu.

3. Static prcssuo'C incrcas"" (reg.>in) u t

e x p a n s i o n..-. SI"Iatic prt."tisurc incn:a.ses ( r e g - : ~ i n ) 10

contrncl i(,n

Which of these statements are correct '/

a. land 2

b I. 2ond 3c. l ood3

d. 2 ond

On Wtich, uf the llollowing fnclors doc••o l-;oir tempernture depend?

1. Outdoor air tcmpco·ohore

2. intensity of solar radiation

3. Absorptivity of wall

~ Convect ive heut tronst\.-r llQtJlicleul at

outer &w'f.occ of ~5. ludoor d<;Si.gt> t '"UIICI'IIIUJ'C

Choose co<rccl '"'""'"'' from the cod""given below:

n. L 2 and 5

b. l. 2 3

c. 3 n d ~d. I.L 3 and 4

39. !n.sllltllanc(lLL>c<)<oing h!'d.!; NOT cqu;o tn n s t n u h \ n e o ~ bent g a i n ~ l>tcause

.1(),

a. R""t gain• arc offi;et by cooling

provided by tbe AC li)'SI<l1ll

b. ltldoor tcmpc•·•turc• aro tower

c. COtn10rt conditio11s nrc m:1£nluiJtcd w

the 5Jl3CC

d. Of Uto storngc effect in tho

c<Jnstrnction material of w:.lls and roof

Consider lhe following statements about

hydrostatic force on n submerged snrfuee:

I. It r'111ams the same even lh"

~ u r f : ~ t . c is turned.

-I I.

.t2.

.&3.

-14.

6 ul 16

2 It 3CI$ vertlc3ll)' even when the w 1 1 u : ei• turned.

Which of hese j. lare ccmect ?

a. Only I

b. Only2

c. Both 1 and 1

d. N ~ i t l u o r l nor 2

1l1o d¢11!h of centre of p= s ure fo•· •

r e c t o n ~ u lnr lamina immersed verticn lly inwater up to height ' h is gh'l..n by

3 . h/2

b. h/4

c.

d. 3h12

·n,e v....ticnl oomponcn( of forco 011 •

curved surfnce submerged in a static liquid

is equ• I to th e

a. Weight of liquid column abm·e theCG. of U1e curved surface:

b. WciQht of liquid the curvedsu.tbcc

c. Product of p oC!ISUrc at e.G., multipliedby Otc •rea of loe curwd •ud'nce

d. Product of pressure at C.G . multiplied

by the projected arc:t of the curved

surface

11te pmnt of application of a horim ntal

li>rce on n cuoved swfnce submerged in

liquid i•I . -

ll . - --- hrihb.

_{j,

Ah

1th Tc. / '" I

Q

d. '· .-Ill

"A = are11 ofthe im mcn;ed surface

b • depth of centre of s urfocu

immersed

l G• ntomcnt of inertia about centre

of grnv i1)1



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45.

~Tl> measure the pressure head of the nu ia

of p e c i f i c gn;vity S flowing, tltrough u

pipeline. a siml>le micr(}-mnoometercontaining a fluid of specific gravity S, is

connected to it. The readings arc asindica ted in the diagram. The pressure

head in pipeline is

a. S - ~ h ( S , -b. h,S, - hS, +6h(S, - S)

c, hS - h,S, - uh(S, - S)

d. hS - h,S, +L\h (S t - S)

Milich List I (Rh ..ological Equ;>tion) 1vithList II (Types of fluids) and. select the

correct answer :

List I

A. = ~ • ( d u y ) " . = I

B. t = 1 (duidy)". n < I

C. t = I' (duldy)". n > l

D. t = 'TQ- (duldy)'. n

List I I

I. Biugbam plastic

2. DilaUllli nud3. Newtonian fluid

l'scudo-plasric nu id

A B ca. 3 2 4

b. 4 2

c. 3 4 2

d. 4 2

D

I

3

346. Which one of the following stre.am

functions is a possible Trrol'llifonaJ nowfie ld ?

47.

a 'I' = x'y

b. IV = 2xy

c. w· A.'2Y

1

d. Ill= Ax • By'

The expression

7 oflb

of/! J"" 1 ,- + -::- t - IV¢ 1· +gz • constantf t (! 2

r e p r ~ s ea. Steady now energy equation

b. Unsteady irrolatiotJal Bernou ll i's

equation

c. St<lldy rotational Bernoulli 's equation

d. Unsteady rotarional Bernoulli's

equation

48. For a circular chaonel, 1l1e wettedparameter (where R t rndius of circular

channel, ~ hnl l' the angle subtcndcd by

the wa ter surfuce at the cent:re) is given by

a. Rfl/2

b. JR9

c. 2R9

d. RG

49. Conside r the fo llowing statements:

A hydraulic jump occurs in. an open

chanuel

L when thl! Froude number is equ al to or

k'Ss than one.

2. nl thc toe ofa spillway.

J . downstream of a sluice gate in a canal.

4. when the bed slope suddenly changes.

Which of hese are correct1a. I. 2., 3 and

b. 1.1 and 3c. 2. 3

d. I and 4

50. An orifice IUC ler wid1 c,j .:: 0.6'I is

subs ti tuted by Vcntu rttnc ter with CJ = 0.98

in a pipeline carrying crude oil. having the

same d1roat diame ter as that of oritice.For the same flow rate. the ratio of thepressure drops lhr the vemurimeter and theorifice meler is

a. 0.61 / 0.98

b. <Mi i 1(0 .98>1

c. 0.98 / 0.61

d. (0.98/ 1{0.6 1 1

5 i. The instrument preferred u\ themeasuremen t of highly nuc tuating

velocities in air now;)s

a. PitOl··Sia tk tube

b. Propeller type anemometer

c. r'hree cup anemnmNcr

d. I lot wire anemometer



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52.

53.

54.

55

The ti'iction tloctor fot fully developed

turbulent flo\\ through a rough c i r c . opipt; e p e n d ~ on

a. Reynolds number

b. Relative roughness

c. R ~ y n < 1 numl>er :and r e l ~ t im ~ m c o ; s

d. Reynolds number, roughuc:ssand diameter to longtlt rolio

In • slcody flow of an <ii iu • pip• iu thefully developed lamiruu: n:gime, the •b =

5lr eSI is

Consbu t across tlle pipu-

h Ma,<imum <1l lbe centre •n<l dec:rea•e•parubolically town rcl., 1he wn ll

boundary

c. Zero 111 the boundary and mcreases

litt<arly Lowortls the cen lre

ll. Zero at Ute <:<1nlte and iucr.:ascs

towards the pipe w>ll

Velocity ofpressure W!!ttUl due-lo r c s ~ u f t .d i s t u r b : t n c ~ imposed in :1 liquid is c:xpa :t llo

n.

b. <Et>J112

c. (p/E)uz

d. (l lpEl"'

Match L1s1 (Bailor$) wiOt List

U{'fype.Description) and se lect the COITe<:t

;lflS\\'ef

List I

;\, lAncashire

B. 13enson

C. Bobcocl. Wilcox

D. Stirling.

Lbt ll

1. Horizontal straight ·n1bc. lire-lubehniler

2. Hcn'i7c)ntal Ar:rigln ltlhe, wnler"tuhc

bflikr3. llenlluhe. w;ller-tube boiler

4. High pressure boiler

A B C' L>

a. 4 2 3

~ I 4 2 3

c.

tl .

4

1

I

2

S6.

57,

5S.

8of t (>

Con• ider the lbllowing m e n tregMdlng lhe tluidi1.ecl bed <XHitllustlonboiiC11! :

I. The combustion tdmper-Jtw·es are low,around <JO()•C

2. The foffilotlon of oxides of nit1tlg.m I>'

low .

3. It rernol'cs gulphur from 1.\0o l duringcomhu•tion procc.>s.

4. ll requires lrigh q u ~ l ofcoal a.' .fuel

Which of o,.,.. m u c correct?

n. l .2. 3 and 4

b. l,2 •nd 3

~ 2.3 and4

d. I and 4

Tht COITOCI go$ fl<)W J)31h i11 J t)'Jlictll J.rg,;mod<.-ntn<LlUr>l circulat ion boller

a. Combustion ohnmb•r - Rd1eBIC1'Superhc:a tcr Econom.iscr Air

Preheater - 1.0. fan - Electrostatic

pre<:ipitator - Stnc.k

b. Combustion ohanrber - Superheater -R ~ h e ; , l . . , . - Eccnomi'ier - Air Preheater

- .Electrostatic - prccipitolor IJ ). fnn -Smck

c. Combustion m ~ Rclrcatcr -Soperheater Air Prohe.1rer -EcOn('"till<:1' - Eleohoswtic prccipillllur

J.D. fon - St.1"k

d. Coonl>uslion charnbcr - Supcrhcal£:r -

Rchearor - Ecooomi•cr - Air Prelteater- l.D. thn - fficctrostatic precipitator

SIJick

Emp lC)yiJtJI, s uperheo\od t . : a r n in l l l r ~ i nlead• to

a. l11crease int.wosion ot' b l : s d i . u ~b. Decreasco in eros ion ofb lad injl

"· No erosion in blading

d. No cbange ln erooion Qfblading

a m enters 3 Oe laval R"""' turbine withan Wet velocity of 30 m/s and leaves withan outlet 1·eloci ty of 10 mls. The work

done by l kg of s tenm is

a, 400 Nm

b. 600Nm.

c.. 800 Nnt

d. 1.2{)() Nm

60. 111 n reaction Absolu te vcltlC •IYangle at inlet 45°, m c ~ n 1>criphcr" l t > C C d



w w

w . e x a

m r a c e

. c o m

6L

Is 75 ms and Uu: -.t-solute velocity at the

exit is a.\ial. The L 1 g e ~ 1 1 e c i f i c wor1. i•

a. 2500 m!is2

. 'h. 32711 mr,-c 4375 md. 56"25 mIn a rcnclion turbino sU.gu cmtl"'lpy drop inlhe stator bln®s , . 4.62 k . l ~ < g nml thnt inthe rotor bl•des is 2.38 kJI 'l'he degree

of reaction of he s !Jig_c is

u. 0.52

h. OA3

c. 0.34

d. 0.26

62 An emergency g1wemnr nf o t.enm norhiM

trip!! the rurbin" when

63.

6S .

1. Shaftexceeds I lO•:, of rot.:d speed

2 Conden•er becomes hot due toi n a d e t ~ u a l ~ . . : o o l i n g \\ater ci1cui:Jlion

3. Lubrication svstem 1\lils

4. Balancing of turbine i• not proper

Select lhe correct an<wer rrom the oodesgiven below:

L Z,ndJ

\> . 2. :1 and 4

c 3. 4 and 1

d. 4, I and 2

Ro<m blower ;, on ~ x a m p l e of<L Reciprocating (pO<ili\'e displaceruunl)

oo mpres<Qr

h. Rotary (positive displocernenl)

compressor

c. Centril'ugal m p r e s s o ~ rd. A.tia l w mpressor

Aco ustic velocity in an e las tic gaseous

~ 1 1 : d i u m is prOfOmtional to

a. Absolute temp«iotore

bt ~ g n a

tempernmrec.. Squore root ofabsolute tampernnore

tl Square root o fsuagnalion rempernturu

[n ;J re_genc•·ntive fLx"ff hea li.ug, cycl c. tht:

econnmic numher of the stages of

regener>lion

a. increases as the initial ~ s and

lc;mpcrature i:Ucn:.ase

b, oJ.:creoses as the mil ial pressure nnd

tcauptT3turo iuer\!:uc

66.

67,

68.

? " ' 16c. is independent of lhc Initial c t < ~

and temperamre

d. depends only on the condenser

pressure

1-lolcb Li>t I (Blades) with List 11

(FOllturcs) S¢1Wlthe correctonsw.,- .

L i ~ l l,,_ , Ceramic blad""

B. Ste.1m tnrbine blades

C. Alloy steel hlades

D. Comrressor h l ~ d e sLi51 I II. High Creclll' ltength

2. Fotgcd and ma cbin"'l

3. Precision c3.St

4. Thick al mid ehotd

5. Thin u:ailing tdt!•A B c2 J 5

b. · 4 5

c.. 2 4 3

d. , 2

D

4

I

3

5

A ~ e r t i n n (A) : Throl11ing pmC<:lls te:ol

:8"5"" ;\1 tnilinl tt:tnperJ ture higher thannuax.imum i n v e t ~ i o n t u r e ~accOtllJo1 nied by decrease in temperatureofthe gus.

Re:ogon (R) : Joule-Kelvin coefficient f<J i•given by (il'l'tq,), ond should have apos itive va lue l'or decrease in tertlperahu'e-

during throttling proc<!Ss.

Both A and R are individu•lly lruc andR is Uo c cot:rect c.< plonutioot oft\

b. BoUo A nod R aro ,jndividuall) true hotR is nolthe correct e.xplnnation of A

c. ,\ is true but R is ials.:

d. • is fa.lsc bul R i> true

ruscrtion ( \) : An ide> regener•tivoRanking cycle power plant willt u r a tste.1ni at the inlet to the turbine same

Utt'lmal o O k i c ' l l ~ V as Camot cycle W()o$.ing

l)etwccn the • uouc 1t mpco'3UlJ't: limit•.

Reason (R) : The c i 1 . 1 1 1 in l r u p y of

stc.un dur.ing expansion in the turbine ls

equal In the ch>nge in entropy of the feed\1 atcr during s e n . ~ i lteating at steam

j!c110tOlOr ]ll'OSSUJ'C,

a. IloUo A and R or" iudjvitlu•.Uy true :md

R is the GOI'I'I:lct "-'<pbruoion of A



w w

w . e x a

m r a c e

. c o m

b. Both 1 and Rare rn<hviduallv true bm

Rill not the correct e.xplnnation ofA

e. A is tma but R Is false

d. A Is fll tsebut R is true

69 As.•en·inn (I\) ; Oc t:me '"'"'1- <• used fo rmling M \tell; in • l ~ > ign itino et1gin<!.

Re•son (Rl : m nf " fitel i•

deJlncd ''" perucntagc hy voluone, nt' twoe.tunc in tt .,,i}tturc of iso .(.Citu\c .u\d u·

methyl naphthalene.

• · Both .:.. and R IU'C indivi<lwllly true nndR i• the corrocl explanulion of A

b. Both A nnd R are individually true bur

R ;,. nollhe correct explanation ofA

c. A is true t>u1 R is fal•e

.1. A is false hut R i• true

7(\. Assertion (A) : Power generated by a fourstroke en.gine working on I lUo cyclehigller lhau tl1e power g.mer.1 ted by a twoSU'oku &::n,ginc for the same swepl vo lume.

spocd, tcmpern ture and pressur"condihons.

Reawn (R) · In • four stroke eng.ne nneCyc le is \!OIIIJlleted in hVO tevolutinns.

h . lloth A and R are individually t r u ~ una

R i. tl>c com:ct ""'Planation ol' A

b. 130th A ond R nr t i m d w ~ l l trUe hutR is 1101 the co•·occt Cl<l>lnnatioo uf A

c..A

i>truo but R

L•fot.e

<L A i.9 hut R is true

7 I. ;\S$erlion (Al : A <!1)UOI<:r ftt)\1 h<:>JI

~ ~ i• thcnnodynumicaUy mor!'e f h c • e n t l h ~ n U1o ~ l ' ; l ] l e l flow type

Reason (R) : A cow>ler How heal

c h ~ o g e r h.M a lower LM'l'D ror the ••meu:mperature conditio iS.

!:loth A and R ore individuo lly true ondR is coro•ect explonnlion t>f A

b. Bolb 1 and R. nre individuoUy true but

R 1s nntt llc cnrrt>o l. tll(tllu.na.tion nfA.:. A is true bul R is fol>c

<L A is fo t.e but R is true

72 Assertion (A) lf tl1e hoal !lu.x iu 1•oolboiling over J Jwriz.onlnl !iutfnCc.l iK

incre:tsed aoo,·c U1 e critical beat llu.x.

lc:mpcr3lll{c ditference l>e1Wet:rl the:t11d Uquid do:reases b ~ r p yReason (R) : Wi th i 1 1 1 . . , . c a . ~ \ n g heat llul'beyond \Ulue CQfNS JlOilding (j ) tlto

critic.1l heat flux . o ~ 1 3 g e is reached when

10 ol l r.

the m1o offormot lon of bubbles iuo highthat they st:crt (o coalesce ~ n t l blanket thesurfot'C \\ ith u vnpotu lilm.

a. BoU1A ond R """ i t t d i v l d u ~ true ondR is lhc com:ct ""Plalt.ltion of A

b. BoU1 A Slid R oro: lnd tvido<tll\' tru¢ bu tR i; not the correct o r t p l n n o t i ~ n of A

c. 1\ i> true but R ill frused. 1 is fll.lst but R ~ true

73. Asse•·tiou (A ) ' Decrease of pressuR: andincn:asc of lcmpernture of the rc frigor.onlio the suction pipeline connecling 1ll•

evaporator to tbe ll!cip>·ocoling compre.,sor

r c d u c ~ s Ute r¢frigcrnling capacity of tlt"system.

Rco•on (R) : Dcco'Oasu of pl'e!..,;ure and

inorcose of tcmpernnore of the retrigerontin the suction 11ipeline connecting the

.:vaporutor to the compressor l'<l<luc<'S tl1evo lumetric cffici.uncy or the rec ipl'o..:aling

compressor

'' · BoiJl A R ore inrlivid'II•Jiy 1rnc :md

R is ohe"""'''" c:xplon:otion nt' t\h B••tl• A >nd R 3ro inolivioluolh mo e ~ 1 1 1

R is n(lt the c<l tT&L IXI>l:onoticju of A

c. A is true but R is f.llse

d. A i• f•lse but R is true

74. Assertion \A) : For • l'erlic•IIY immersedSUrface, the depth 11t' th1> centre Ofpr<.,.SUI'C

i> Independent ofU1c dcn•i ty of ile l i ~ u i dRcnson (R) : ~ l t r e of p1ossure ~ . , . nbovcU1e centre of area of the imme1Scd o . r f ~a. Both A •nd R lli'<: ind ividually truo and

R is the corn:cl explannlion ot' A

b. Both 1 and R ore individualh trueR is not the o r r ~ c explonation of A

c. A h1te hut R false

d. .\ is false bui R is true

75. ,L\..sertion (A) : $treomlin..., can cross one

anot.ber ifJle

lluidhas

higher velocity.Reason (R) : AtM 1ft1ciently high velocity•U1e Reynold& number is high and atsuffiL'iently hiBh Roynold$ numbet'>, U>estroctwe ot' the llow is of LUJ'bullml type,

a. BoU1 A 111\d R""" individu>ll)' andR thecorn:c.t Cl'lplnnolion ofA

b. Both A and R inclividuollv true bulI{ is 1101 the correc-t el\PL1nati.m ofA

c, , \ is !nee but R t3l<e

d. A is f . o l ~ e hut R is true



w w

w . e x a

m r a c e

. c o m

84.

85.

86.

87.

MS.

a. Both A and R are Individually true rutd

R Is the con'l!ct explanation ofA

b. Bmh A and R are 1ndividu;tlly true bu t

R Is no t the correot explanation ofA

c. ( I is true but R is false

d. A is falso bu t R is true

A heat. pump fo r domestic e m j o ~operates between a co ld system at o•c andtJoo hot S)•Stem at 60°C. What is theminimum electric power consumption if

the hea t rejec.ted is 80000 k.J/hr?

~ lkW

b. 3 kW

c. 4kW

d. HW

A Caroot refrigerator requires 1.5 kW /tonof refrigeration to ma intain a r ~ g i o at ateonpemture of - 30°C. The C.O.P. of theCarnot refrigerator is

a. IA2

b. 2.33

c. 2,87

d. 3.26

In a stanclard dunJ air cycle. for a fi .xedamount of he<U. suppliecj and a fixed \'3 lue

or compression ratio. lhu IUI.!CUl e f l b c t . i v ~ Jpressure

a. Shall increase with inc rease i11 r0

(pressor< ratio for constant vo lumeh<rdling) decrease in r,

(constant prt'j;sure cut-ol'fratio)

b. Shall inc rease with decrease in rr andi ltrC:H.SC i 1 r

c. Shall remain indepe 11dent of r1

d. Shall remain indcpe nd"nt of r,

Bomb cnlorimeter is used to de termine therelorilic vu lueof

a. Solid fuel onl>

Gase-ous fuels onlyc. So lid as well. as gaseous fuels

cl. Sn licls as we ll as l i ~ n i d lioels

i!

I ---- A

89.

90.

'II.

92 .

11of to

Exhaust em issions vs. Alr fuel ratio curves

for a petrol engine arc shown in the abovefigure. The curveC repn.>se.n ts

a. Hydro carbon

b. Carbon dioxide

c. Curbon monox.iM

d. Oxides ornitroge11Orsat a p p a a t u ~ i; used to de tennineprodnets ora. A I consrhucnts of fuel combustion by

mnss

b. A I c<lnstitucnts of fuel combustion byvOILime

c.. Only dry constituents of combustion

by mass

d. Only dry c<lnstituems of oombustio11

by volume

Match Lis t (Measuring Appliances) withLisr II (l'roperriesiComposition of Fuel)

anu sekct the correct answer :

List !

( I . H) d1'1m1eter

B. Bomb calorimewr

C. R ~ i d bomh

0 _Orsa t apparatus

List II

) . VapOUJ' pressure

2. Composition of products combustion

3. Sp<.oci fie J>'111Vity

4. l·kating value

A B

a. 2 Ib. J ·I

c. 2 4

d. 3

c3

I

3

2

Dq

2

I

4For a simple closed system of constant

composition . the. f f e r c n c ~ betweennel and work inlernctions is

idenriliable as the ch:mg,e in

a. L7nthalpy

b. Enll'opy

Flow euert.')'

d. t ~ r n a J energy

It' the performance of diesel engines ol'

different s izi!S. cylinder dimensions and

power ratings to be compared. which

<f the following parameters can be usedfor such comparison ?



w w

w . e x a

m r a c e

. c o m

93.

94.

95

9G.

'>7.

o. Swept volume

b. Air fuel ratio

e. Specific brake fuel consumption

d. Volumetric cllieiency

The propulsive ~ n k i u of a turbojetoirco-.11 approaches 1U0°o when the thrustapproach<:><

-a . Maximum

b 50')o of he maximum

.:. 25"o e m ~ m u md. Zero

Iolcollify the l"""" 's Yuo• whic.lo Ulc twu

integrols J dv and - J dp . i u ~ tbetween two siv.:n give

wdue

a. l!lentloalpic

h lsothermol

c. lsent·rop1e

d. Poiytr<lpic

\V hid> one of lhe foiiO\>'Ul£ phenomenonocco<S when gas u1 a piston·in-<Jylioder

a'-Sombly axponds reversibly at ~ o n s t . 1 np r t : s ! ~ - ' 1 . l f O"- Heot is added to lhe g:l!l

b. H""t is remo ved fro on the gas

c. Gns does work from its owll stooCd

L ~ ! Yd. GM undcrgO<.'S • diabolic expansionDuring ~ ! c o d y now tl011tpi"Cl;SLOII pl'oCO!S

of ,, gn• with mass flow ro te of 2 kg s.

in.;,e.,.e in st>ecific enth alpy 15 k.JikgaJid di'Crease in l;inetic 011"''8) 2 k.Jil(g.The rate (If heal rejtlll ion to Uto

e m ~ r o n m e h 3 kW . TI1e power neededto drive the compressor is

P. 2.) k\\'

h. 26kW

c.. 29 k\1

d. ;\7 kW

Consider the fo lloWing o t e m :

l 'l.ert>lh law of thermt><lynamiC!I i,

o lnted If> e,nrernt.uo:e.

2. P.nl'rbp) is reliolcd lu lirst law of

r m n i l m i c . s .3. lntcrruol energy of "" ideal gas i.< •

function ortempcnture nnd pressure.

4. van der w a a r ~ equation ;. rclnted to

un idenl s•••·

13 ,,, 16

Wloich of Ue nbove ~ ~ t e m i•inreCOrrtel 'I

a. I only

b. 2.3 and 4

c. l and 3

d. 211ncl 4

9K ('l:J., e<mt.:oined 111 a clc:>st:d sysltro

consistillg t>f pi'llon cylinder >n'1lngonocnlis cx.pnndod . Work dono by tl1o gas duringC<:J>3nsion i&50 kJ OI'Crease in ontemal

~ - n c r g y of the ga5 during cX>•ns hln U. 30kJ. u, t IJ•arur . durin !1- lhe po·ucoss i.<

equal to

•. 20 kJ

b. 20 kJ

c. 80 kJ

d. - 80kJ

99. Vruo dcr Waals' equation of stole is given

by \p + a t\-')(\· b) = RT. The n n ~ t a bin the cqu>liun in leMJIS of spe<:illc volumea! .:ritical point v,;. cqunl lLI

a. v.J3

b. 2 v

c.. 3 v

d. 8n I (27 v, R)

100 . Sll lu rn tod i ~ u i t l ol " lugh r>'""""'' plhaving entloo lpy ql' . . moted li<111id 1)00

~ J i k is Umoulcd to n l<IWcr pn:ssure p, , Atp r e s Jll <:nthnlp y of sntur•ted liquid

lond 11••1 of lhe ... r ' '•pour •rc: 800and 2800 klikg t e ~ r p e c t i v e l y 'fhe dl)'nesslr•ction of vnpou.r ofter throttling processis

a. 0.1

b. 0.5

c. IW2S

d. 0.8

lUL J\>t. !dl Loll l (T.:rms) wii!J Li!t ll

(Rclntions) arid soloc l the correct omwcr :

ListT

A . Specific heal i.ll l"'nsL'lr)t vo lume C.

B. lsotloannnl compressibility kr

C. Volume expnnsivity f:l

D. Difli:ra>ce between •p<:<:ill.:. heat• :ot

con.i.lant pressnrc :tod :tt constant

volume, t ,- C,

U st ll

I. II >· (Clv/ Cl7'),

'J , T!l'p i PT' ). (""Im ),



w w

w . e x a

m r a c e

. c o m

02.

3. t(o.vl aT)

.t. - tl v(o•·la1),

A B c D

a, 3 4 l

b. 4 1 J 2

c. 3 4 I

d. 4 1 2 J

Consider the following stalemenlS

pertaining to the features ofa regenerntive

Steam cycle plant as cqmpar<d 10 u no n·regenenuive plant:

I. It increases the cycle ctlicicncy.

2. It requires a bigger bqilcr.

J. It i r e s a ~ m a condenser.

Which of he above statements are correct?

a. 12andJ

b. I and2

c. 2 and 3

tl. I and 3

IOJ. For a steady flow process li'om slate I to 2.

entha lpy changes fmrn h, = .100 kJ /kg 1<1 h2= I00 kJ/kg and emropy chan ges From s, =1.1 kJ/kg·K to s2= 0.7 kJikg·K.

Sun·ounding e u v i r o n m c n t ~temperature is JOOK. Neglect changes in

kinetic and potential energy. TI1e change inavailabi lity of the c m is

a. 420 kJ/kgb. 300 kJ/kg

c. IKOkJ/kg

d. 90 k.Jikg

I04. For a heat engine operating on the. Cam<1tuyelc. the wo rk Otr\pu l is ll4th of the healtransferred to the sink.. TI1e elliciency of

eog inc is

a. 20%

b. 33.3%

c. 40%

d. 50%I05 , Consider rhe following statcrncms about

modincation ln a gas ttll'binc power plant

\\O rking on a simple Braytlln cycle

I. Incorporation of regeneration process

increases spocitic work output as w ~as tbermaIefticiency .

1. Incorporation or regeneration process

increases ll>ermal e llicieucy butp c d f i c work putput r<mains

uncharged.

,,flit

3. Incorporation of intcrcooling proce•sin a multi-stage compression system

in" r-eroses speci foe wCirk output but theheal input also c l ' C ' ~ s c s .

4. Incorporation of intertooling processin a muhi-stoge compression systeminc,reascs specific work putpuL the heat

addition remains unch<!rg<'d.Which of the above statements are correct?

a. I and 3

b. I and 4

c. 2 and 3

d. 2and4

I06. March List I with List II and select thecorrect answer using the code.; given

below ll•< Lists :

107.

Lisr lA. Be ll Coleman c.ycle

B. Stirling cycle

C. Ericsson cycle

D. Diesel cycle

Lisr l lt. O ne constant r e s s u r e one constant

volume arid two isentropic

1. Two constant pressure and twoisentropic

3. Two constant pressure and (WG1

isothem1al

4. Two consU!nl volume:.

and twoisothermal

i \ B c D

a. 2 3 4

b. I 3

c. '2 4 3

d. J 4 2

I.

ilPl'>

.J J,cK11 ~ J ,

2.

rt::::Ir I • "' •

...--.



w w

w . e x a

m r a c e

. c o m

3.

·o'! • •• 0

S- - -+

The correct sequence ofahe cycles gfVt'l l in

the above T-S diagramsa. Vapour compression refrigeration,

Rankine, Diesel, Ono

b. Rankine. Vapour compressionrefrigeration. Diesel. Brayton

c, Rankine, Carno l, Ol1o, Brayton

d. Vapour compression refrigem ainn,CarnoL Diese l, Otto

1()8 . l'he absolute je t exil ve locit)' from a jelengine is 2800 mls and lhe lnrward Righ ivclocily is 1400 m/s. Tite propulsive

efticienry isa. 33.3JWo

b. 40%

c. 66.(>7%

d. 90%

I09. rhe efficiency of et engine is

a. higher ul b.igh speeds

b. lower at low speeds

c. higher a1 high a liaudes

tl. ''lune al all altitudes

I I0. A metal rO<I of 1cm diameter has aconductivity or 40 W/m K, which is to beinsulated with an insulating material of

conductivily of 0.1 W/m K. If theconvective hear tronsfer coefficient withtlte ambient UU IIOSphere is 5 \VIm1 K. 0•"criticalthick.nessofinsulolion wi ll be

3. I Cl11

b. 2cm

c. 7 em

d. 8 em

Il l. Match List !(Process) wilh List II(Predominant P a r ~ m e Association Witl•

the Process) and :>elecl ahe correct answerusing the codes given below lbe Lists:

List I

A. Mass transfer

B. Forced convection

C. Free convection

D, Transie111 conduction

List 11

I. Reynold s Number

15 of 16

2. Sherwood Numbcr

3. Malch Number

4. Biot Number

5. GrashorrNumbcr

A B c I)

3. 5 2 J

b. 2 5

c. 4 2 I 3

d. 2 J 5 4

112. The velocity <rnd temperature dlstribudonln a pipe Oow are given by u(r) and T(r). Ifu.,; is the mcnn vcloc.iay at any s ~ c t f o n ofthe pipe. Ihe hu lk: menn lempcrnture al th!llsection is

a. J1(r) /'(r )r 'dt

(l.J"tr) 'r(r) dr

• Jr 1r

c. 'J''(,.>flrJdr, '-1trJ

1 ,,

d. ~ u ( r ) ( 7"",ro "

113. For fu ll)·-dcvclopcJ turbUlclll now in npipe wit.h heating. the Nusseh number Nu,varies with Reyoolds number Re and

P r a n t . l ~ number Pr as

a. R 1 r,"b. Re(;S 1',01

c.. Re',s P.....

d. R.1' " Pq3

114 . Consider lhe following statements inrespect of uulomob ile engine wilhihennosyphon cooling

1. H ~ ' l l l transfer frt•m gase.• 10 cy linderwal ls takes place by convection and

rndimion.

2. Most of the heat transfer from radiator

to atmosphetetakes place by radiation.3. Most amount of heal - a n s f e r From

radiaaor ro atmosphere takes place byc.onvection.

.J. Ileal transfer from cy linder waits takesplace by cqnduc tion und conwclion.

Which of the above statements are con·ect?

a. 1,2and4

b. 1,3 aucl.J

c. 2. J and 4



w w

w . e x a

m r a c e

. c o m

d. I and 2

115. A bod} at 5UO K cOOls b) mtliu ling t ; ~ l h)

a m b almm;phcrc maintained nl 30U K.

When the i">ody has cooled to 4(j(J K. the

ct•lllng ratr us a pcrcco1ll!gc of nriginal

ct•l•ling is about

a. 31.1

b. •11.5c. 50 .3

d. 80.4

116. l'rnclion uf radiative energy leav ing " ""surface lbat ~ t r i otl1cr surl"ucc is

called

u. Rad lutlw flux

b. Emissive of the li rst surracc

c. View !actor

d. Re-radiation nux

117. A linnod surlilce cons ists of rool or base

area of I m' and lin surlucc area of 2 m'.

I he average heat transfer cocnicicnt lbrtinn ed surfhcc is 20 Wlm, K. Effecti venessof fins provided is 0.75. If llomed surface

11 tl1 root or base tempera Ure l1f so•c i:>

transferring hclll to a fluid at so•c. thenrate o f he:n lransler is

a, 400 wb. { ) ( ) w

"· 1000 wd. 2 1 ~ 1 w

11 8. Which one of the following is p-lJ ingrnm rnr air rclrigerntion cycle'?

a.

p ~ ,__, ,,

b.

r [ ~ ,__-, - -c.

1 - ~I I ----,,!- - . := ; - ; - - -

d.

r · ~- -+ I

119. Mutch List J ll'roccss) wilh Lis t It ('l'ypc)lor Bell Co lcmnn or Joule or R e v ~Brayton cycle lo r gns cycle rclrigemtionand select lhc com.-ct nnswcr:

1211.

Ust l

A. Compression

B. Ileal rc;jcction

C. E.'pansion

D. Ileal nbsorption

List I I

l . Isobaric

2. lsotllcrmul

3. lsenlropic.

4. lscntbalpic

A Il

3. 3

b. 'c. 3 2

1.1. 3

c u4 2

3

3 2

2 2

Cons ider tho fl>llowing m in

respect of al1sorption rdrigeration and

vapour com pression refrigerntion systems :I. The lorm cr run s nn low gmdc cnt•rgy.

2. The pumping wo rk in the ~ isnegligible since spccitic volume of

stmng liquid so lu tl<m is small.

3. The. JHtcr un absorhcr " hilcthrmer uses a generator

4. rhc I ..tu id pump alone rerluct:s

t'QmprCSS\lr uf the Ialter.

Which of hese stntcmcnLqnrc.con·ccl'!

a. I :md 2

b. I and3c. I and -!

d. 2 and 4

ies mechanical engineering paper 1 2003

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