w w w . e x a m r a c e . c o m I .E . S -{ ORJ) 20 0 1\ MECHANICAL ENGINEERING J ~ - = = : : = = I. 2 3 . PAPER I f N , 1 IS th e s p ecific spee d or a pump handli n g larger d i sch a r ges a t low heads and 2 is tha t or a pump hand l ing low <.hscharges nt h 1g h head s, the n one o f the follo\\ mg IS correct., 11 . N f1 z b . N 01 < N ,, c . N 1 = N .l d All t h e above three are p()Ssible under d i fferent situa tion s Co n side r t h e following s ~ t e m e n L S in respec t or impulse steam turbines I Blade passages are o f con s tan t c r oss· se c t ional ar ea. 2. Partial ad mi ss i o n o f steam is pe r mi ss ibl e. 3 . Axoal thrus t is on l y u e to cbru1ge in now l ocil) o f s t eam a t mle t and ou tl et o r movi n g bla de . Which o f the s t atements given above a r e co rr ect? a. 1 . 2and3 b . O n l y I and 2 c . Onl ) 2 and 3 d. On l y 1 and 3 Con sider t h e fo ll o\\mg stn tem cms I Fo r ward swe pt blade i mpeller is used in draft f ans . 2 , Fonvard swep t b l ade tmpelle r is u sed in room air- co n ditioners . 3 . Radia l lipped blade impe l l e r is used in drun fans . 4 . Fom • ard swep t b l ade i mpeller i s used in exhaust fa n s Wl uch o f the tate m c ~ n s g n · en a b ove i s/are correct I a . O n ly I b . Only 2 and 3 c . O n ly4 d 1 2,3a nd4 1 . 5 . tn an a.xia l llow im pul se turbine. energy t ransfer takes. pla ce due to a. Change i n relative . kinetic energy b . Change iJ> absolute kinetic ener gy c . Change i n pressure eo e r g) • d C h arlge iu energy becau s e or cen t ri fu gal fo rce Cons t der the ll ow mg I , S u per h ea t e r 2 . Eco n on>ize r 3 . Aor pr e- h ea t er 4 . Conde n ser W h tch o f the abcve tmpro e o\ erall s t eam po\\ cr plant emciency l a. n l ~ · l 2an d 3 b O n y 2 and 3 c Only I and 4 d . I , 2. and ..t Cons • der the fo ll owm g. I ~ e c t o r 2 . Eco n omizer 3 Bioi\ -o ff cock 4 . S t eam s top va h · e W h tcb of t h e abore 1s / are no t boiler l 1lU1gs ? a . Only I b . Only I and 2 c , I , 2 an d J d . 2 and 4 In a s t eam r ~ e to mcrease t h e Ye loci ty of steam above sontc ve l ocity b y e.xpunding s team below critical pressure a . A vacuum pump i s added b . Rmg diffusers are used c . DIYe r gen t portion o f ~ 1 e noule is nec essary d . Abrupt change in cross-sectio n is n eeded
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
criticul energy us C<llllpllrcd to neutmnhindin!). <nergy ntoms is
a. less
b. s a m ~c. more
d. cxnctl) tWu Lmes
What is the Oash po int ora li4uid fuel ?
a. fltc tcmpcrumrc ut which the fuelignites sponttmcously with a bang
b fl1 te.mpernture nt whrch the fue l
e m i L ~ vapou rs at rate '"hich r o d t • ~ e ~un inllammahlc mi:<"turc with air
c. The lijntperuturc at which the fuij lignites wi th a clearly VISible Oush
d. The temperntlir•· at which the fi1cl
ignites wi thout a spad'
What IS t.he function 0 I' hcuvy water 111 unuclear reactor?
a. It e r v ~ s us u :onlan t
b It serves as a moderator
<:, II serves as a coolant ns well as amodeml\>r
d It Krvcs us a neutron absorber
Consider the loii<)Wing stmcmcnrs :
The ~ a s c ~ measured dirccLJy h) OrsutliPIIRriltus front n Oue gas stunp tc urc
co1. 0)1u1d N1.2. !3omb ca lorimeter m e u s hlgher
caluritic value , r fud m constantp r ~ s s u
3. For burning I kg of fuel (carbon) 10
curl>on monox1de. the stoichiometricquantityofair required is 8/3 kg.
Whichof the st1lll'111tnts given nbuw is/arc
c o r r ~ c 'I
a Ullly I
bOnly 2
c. Only 3
d LlandJ
In vapo ur C f > l p r e s ~ I O f l refngcrntioncycle for makm g tcc. the condensing
tcmpcratlli'C" tor h1gher COP
a. Should be n c ~ r the critical tcmperlllltrcof he rcfrigcmnt
b Sht>uld be utxwc the cnticultemp11ruiure of he refrigentnt
31.
32 .
33 .
34.
t uf l l<:. Should be much below the critical
temp<.,nuurc l'l!frigcram
d. Could be of any vnl ue liS it docs notofli:ct the COP
. s
fhe t1gure !liven above depiCs saturationdome fur w.mer on the tcmpermure-entropyplane. Whut temperature difference.1T shown on n typical ISobar line known
as•
a. D c g r c ~ <Ifwet bulb d c p r c S ~b. Degree o 'saturauon
Degreeof u b ~ o od_ Dcgrc.c ()f rcltcat
Whnl does application ur centrifugal urr
co mpressors lead to?
a. L11rgc fron tul urc(l ofuircruft
b. Higher now rdle 1hrough the engine
c. Higher ai rcrnfi spec<l
d. Lowe r frontal urea of he llllcraft
Con>idcr
the following
st:ttemen
t£
indi0111ing a compariso n w c e n r < l CandJet pro pulsion ~ y s l c n t s :
L !3oth rocket :md jet engines corry thefuel nnd os.idllll l
2. Rockel' do 11\lt emp loy compressor orpropel!or.
d. Insufficient int0nn.1t ion to cl<ltenninoany of the: above
51. A homogeneous solid of any arbitraryshape flools upngbt in a homogeneousliquid with inunen;cd volume \ and is in
stuble O<Juilib•·ium . If Otc solid isMe rllJmed and made to Jloot upstde down
in a difl'crent h1lmOgcneous liquid with<*actly MOiftt vuhuno V >hovo Inc liquidsurface_ lbcn lhe cc tuiJihrium
a. Would be stab le
b. Wou ld be neutral
c. Wou ld bc: unstable
d 1\tay or •n•y nor be •tnble
52 A 25 em long prlsmotic homogcneQussolid in water wid1 its ~ x i s verticnland JO em projecting above water s urface.
1f th" snmu soJjd floats in son1c oil wiUlOXJS vcrticnl Jnd 5 em projecting above theliquid surface, what ;, lhe spedflc grnvily
Qf thc oU ?
• • (),6()
b. 0.70
<;.. 0.75
d. 0.80
53. A semi-cin:ular plane area of diam<leJ' 1
m. rubjcctcd to a uniform gas pressure
of 420 kN/m!. \Vha l JS the moment ofU ~ r u s t
tapproximately) on the area "bout: U g h ~ d g e 1
54.
55 .
11. 55 kNm
b. 41 kNm
c. 55 kNm
d. 82kNm
A hori:z.onbll oil tnnk ;, in lhe of •cylinder w ~ hemispherical end•. If il isexactly half full. what i• the ral!o of
mngnitudc Cof lhc vertical C<Jmpon.'Tll il f
rcsulto.nl hydrostati" tllfUSt on on"
htflliBJlhoricnl end t.o, U1a1o f tl1c hmizonL1I
com ponen t'/
" · '2Jn
b. n/2
4/ (371)
d 3nt4
Tite A;tnnd !lrtl nluto"phoric prosl$UfC 762
r»m of llg. At a specific loc,11ion, lhe
IJ•J<Qmctcr read, 7tHI mli1 of Hg. A• t h i ~
7 ol 14
piAco;, wha t does an 3bsolut" pJ'I:ssuro of380 mm ufHg correspond to 'I
-a, 320 mm of Hg vne-aum
b. 382 ofHg vacuum
c. 62 rom of l lg vnouum
d. 62 mm uf !!•ugc
56.A manometer is n1ade of a tube of uni fom1boJ'<l uf 0.5 cmz CJOss-sectionnl areas. with
on< limb v<-or·icol nnd UJo other limbin.clined >I 30° lo the ho ri:z.onto l, Bolli nf
ils limbs are open to ;•lmosphere and,initially. it is partl.v filled with 4
manometer liquid of •r ccilic w·•vity 1.25.If lhen nn >ddilional ,.,,hlme or7.S em" or"" ' er i• pc1ured in lite inclined tuhc. whall1 Ot t •·ise of tl1o mon illc.u6 in lbc vcrtiClll
luhe?
a. 4cni
b. 75cm
c. 12 t111
d. lh'm
57. A vert ical clean glass tuba of unifom1 boreis- a pie7..ometer to measnre the
pressure o( liquid at> po in l The liquid bas
• specific weight of 15 kN/m3 aud •
r f ~ c c len.>1on of 0.06 N/m in coniMI11ilh ait. It lor lh c: licWid. the JlngJe ofw11L'cl g11$s i• £cro 3nil capillarycisc in Uu: tube is not to 1::-;cccd 2 mnL
whnl is the required minimum diome!Of' of
the tu be: 'I
S8.
59.
a, 6 11111'1
b. gmm
c. 10 m1rt
d. 12mm
When the JlresstJJ-e on 11 given mass ofliquid is ~ ~ ~ > t « < from 3.0 I\1Po to 3.5
MPa. the density of the l i ~ i d incre.ucsfTom 500 kg'm' to 50 I kg/m . What is Ihe
avernge va lue of bulk modulus of (h. ,liqujd over tJu.t given pressure runge '1a. 700 lvfi' n
b. 6(K) M P ~c. 500 tv!Pn
d. 250MPo.
A.-slll'lion (A) : Nozzle control guvcrnin.gcnnnol ba tn reaction ste.am turbines.
R c 3 ~ 0 n (R ) : fn l'u;&c.liou t e a m h ~ r brul l iorlmi•s icm nt'srenm must lake place.
'' · Both A and Rare individU4lly !nrc 1mdR is theC()rrect : q > l • n ~ t i o n ofA.
h. Both .\ ond Rare individually tme butR is not the correct explonalion ofA.
c A is true but R i< f a l ~ ed. /\ is fR l§c but R is true
Assertion (A) c Fire tubo u i l o ~ de.• 11111
opomre at high J)fC!iSUrel< whjle water inhc
hoi\ers ''l,eratc: at high pressures,
Rea.on !l'l.J Oue to high temperatuN of
llu.e ga<cs. fire tubet; m a fail due to creep.
a. Both A and R "re individually lme and
R is C<Jrr'ect explanatjon ofA.
1>. Both , \ and R ar e lndividuallv true but
R is not the ~ o r r e c t e . ~ p l a n a t i ~ n of A.
,-\ is tme bul R f•l'e
tl A is fn loe hut R is true
A . r1Jon (Al : 'r be internal en.,gy
depends on U1e internal stare o.r a body. •s
dt>temtined by its tempmwre. p r e s s u ~compo.!t ilion.
Re:oson (R) : lntduJal ~ n c r g of a suhstanc«
docs not include nuy energy i t may
posse-ss 3 result of its mo.1croscopic
position or movement.
n. Bolh A and Rare individ11.1lly true nndR is tl1c correct v l • n ~ t i o n ofA.
h. Both .-\ 3nil R :<re j0dividunll)' true hut
R not tl•c correc t r t • n • t i o t > ofA.
c. A is true bul R ls false
d. A is false butR is true
A . rtion (AI ; ·noc change in nvnil:rl;rility
nf a •ystem is equ•l ro the ch:ange in !heGibbs tlmction or system at constanttemperature and r e s s oRcallQn (R) . Tbc Gihhs 1\Jnotion i• •l•¢fulwhen cvaluntjng. Utu avuibbility of syes-lcul)j
in wbich chemical reactions occur.
11. BoUr .\and Rare individt1.11ly truo 11ndR is the correct e:q>lonution ofA.
b. Both A and Rare individlllllly ln..: hu tR is not the correct explnnation ofA.
c, A is md but R is false
d. A l. fabebut R i• true
As$cr1iO n (A) . All t:()nslanl ctllfll(l)'
processes are adiabatic, but oil odiabuticprocesses are- not isentrop ic .
64 .
6S.
66.
61,
8 of
Reason (R) : 1\n ndial>atic process whi.>h
resists the exchonge of energy to thesurround ings Tnll)' hAVe irrevt:rsibillty dUe
to friction ond b c t ~ t c!Onduciion.
lL Both A and R Jrc individunUy lmd and
R the C(11"l'l;;ol explanation of t\ .
b. Bolh A und Ran; Iudividuall) ! I ' l l ~ but
R is not tho correct crplnnnlion ofA.
c. A i> true but R m rise
d. A is folst but R ;. true
.-\sscnion (AI : At "CI) higJT densities,
<!llntprt:llsihilh y ut' a teal gas is le.s thanom:,
Rc:oson (RJ : As k'tllperntw·c i>;
consjdemhly reduced, tho molecules >re
brought "loser togetlrer and t11ermqnuclearattractive forces b ~ c o m e greak.'1' atpNSSurcs aroLWd 1\U>a.
• · B o ~ • A and Rare individuaUy ll'llt: and
RU. the cor:n:ut c:< plruwtion of A.
b. BoUt i \ •od R •re 1ndividWllly t r u ~ but
R is not the coLY«·' ~ ~ p l n n n t i o n of :\.c. A i> true but R is false
d. A is false hul R is true
Which one of the following is used to
bring down the speed of on impulse s1<'111ll
turbine to pnactica l limil-; •1•· A cc'TltTifitg• lgownuJr
b. Co•n1>ounding nf U1c turbine
c A large Oywheel
d. .\ senr box
C o n t i d e r rhc IOllowing fiw :1 t c : . : . 1 1 ~ tlll1hine
pnwer pllmt:
I. Reduction in blade erosion.
2. lncrcasiJ ln turbine speed.
3. lncr.:asc iu specific ou tput.
4. L ~ e in cycle dlicocney .
Which orl1e ahove occur/occur.o due torehcntingvf C o 1 m '