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( ..... E. rre I ??~ I .;fll
---~MECHANICAL ENGINEERING~~--
3
5.
I r Ote cross-secdon of n member o;; subj~cted to a unjfonn shear stress of mtcnsuy q .. then th t>f rig,idily) 1L 2q~/C b 2Ciq' c q1!2C d. c/2.q2 For u bnenrly CIIISIJc, iSOirl>pc 1111d homogcn~u. mo1onal, the numhcr o f elnsuc oonsluna;.~ rcqtun..'"CI lf'l relnrc: strcs~ :u1d struin is o. l\\'OP b lhre;, c. four d. 51~ The SlUIC or stress R1 po mt in D lo ndcd member ts shown tn lh~ figure: The 1no_gnit.udt: rt frnuYianum shear 'vess as
: passwg through
one end or tb" rod rbe: C...,.le:nsion produced in the rod d ue to ccmrilugol forces is (w is tlie wei_gJlt of the rod per unnlenglh und ~~ IS U1e angular' olocn) o f mtauon ofthe rod R W'''' I gl. b 1u w/J I Jl{l I! /U h( / gl d Jgl'l d 1\ ctreulnr sh11 It ficd ul 1\ hus 1hnmetcr I) lhr ht~rorus length and dia1nolcr OfliJWr the other hal f. Wha.t is the ro tutiun of C nol:m\'e to 13 i f the rotanon ofB rt!lmive to A L' 0. 1 rodian'! 1 . ,, o loa 1("\
;r--112---l'-tn4 n. 0. 4 rud.ian
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10
II
12
14
b 0 8 radlwt c I () radiun d 3 2 radian If h~
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'' hole p\3le l alone c"n be used b. hole plates 1 ond :1.1nbe uSC20. Chills are uccl in casting mould to achieve difllCtiono l soliditicntion h. reduce pnssihility vi' b\c)\\ hnles 1!. ""du.crodu~o steel wa,her.thema:~imum punch load .al i~ 2 III'N. Tbe pl~tc lhicl;nc$S i'< 4mm and pcrcc:nt~gc penc::ttalion is 25. Titc w(>tk done during Utis ilcel using on o!. lll litre .:.. 1.5 litn: d, 20 lilnl
24.. A muhi~pindle ur operolions wlUt UJIIQS 50, 60 .. 65 JUtd 7.5 seconds ol c.,ch of it work c.cntel'li. l'he cycle time (time reqmred to m:anufacttU'e line wook piece) in seconds w iU bco tL 50 ' 60 I 65 75 " (50 60 65 I 15Y~ " 15 4 d 75
25.
26.
28.
2!).
311.
.l ui n To reduce the o:on;umption of 1ynthetie re*iru\ .. theif)&ore.tienl added is a. aeccler~tor b. c lostont ~. 2 ontl .1 d .. l. 2ant1 3 'lne tollowln& uctivitie$ are to b~> 11crfqrmcd In ~ par11
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:! Time Study 1. Job Enrichment -l Job Enlar!,>ement /\ n Qptimi!l sequence Wltul~ conSist 111' a 1, 2, 3a11d 4 b. 2. 1 3 JSnd 4 t: 3, 1, 2, ruad .j d 3, 4, J and :!
J I Mor~ey required for the purchase of stores. pllyrnena of wage.~ etc isi."tlown AS a. Block Capital b. Reserved capital c. Authorized Capital it Working Capital
.32 Tlixed investl)lents for manufacturing a product in a particular year is Rs 80,000/-l'bo e!.limated sales For lhls pwisure in the vessel is a. 2"!t.97 bar b ~oo bar a 26 03 bat d 34,84 t.ar
35 A mixtun: of gases expand;; foma 0 03 rn' to 0 06 m3 at a constanl pressme ol' I M Pn and absorbs 84 kJ of heat duri ng the process 'fbe change in Internal evergy of ll1e mixture is a. 30 kJ b. 54 k.l c. 84 1..1 tl 1 14kJ
36 Match List I 1\'lllt US1 U and se)ect the corlect nns-.er using the colic.< given below the lists
List l II Mechanical work B rild(! s ()
l.fl /' C Zeroth Law D 1-l-15 List I t I. ClausJUs-Clapeyauu equation 2. Gibb' s equation J. IIi~ grade energy 4. Concept of' temperature C'QIIes;
/\ B C D L I 3 2 4 b 3 2 4 c 2 3 1 3 ~ 2
.1 ut IJ
37 Given that along llte path 1-2-J , a system absorbs I 00 kJ as heat and does 60 I..J work while al.ong the path 1-4-3 it dOcs 2.0 kJ work (see tigure given) The heat absorbed during tbe cycle H -1 is
p 2r-713 :~4
L------- v a. -1401..1 b. - 80 kJ c. -40 kJ d. -60 kJ
..lS. ln a cyclla heat e11gineoperating.between a source temperature of 600'C and a sink temperature of 20C. me lea.~t rate of bt>al rejection per kW ne.t output of the ~nglne is a. 0460kW h 0,505 kW c. 0,588 kW d . 0.650 kW
30. IJI a steam coudenset, the pBJ!ial pressure ofsr.,am arul air IU'e 0,06 biU' and 0.007 bill' respectively llte condenser pres:,ure is a 0 067 bar b 0.06 bar o. 0.053 bar d. 0 007 bar
-10 Tite gi von figure shows the variation of force in an elementary sy~tem which undergoes a process during which the plunger positiou changes form 0 to 3m. u the init mal energy of the systean at the end
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12
.u.
nftbe process is 2.5 J higher, then the hca& utwrbod dunn~ the ~s Is
.~~ r---~~~----~
I I I
: l : ~--~,r---,,~.~----~. 3" 15 J b 20J c .!S J d. .30 J The fundamemal \Ul1l of entl1alP} 1S
~ M Ll1 b M l,l t' e. MLlT! d. ML1T'
lncren~e in t!Tllrot}Y of a system f
Tt~ ~ ~s
ri~ b ->5
Tj~
'rr:t I
(I --+S
17
5 of 13 Thr emden~ of a r
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49
~I
S2
fd p
-+ 5 List II I Vapour compressioo cycle using
e.'pansion valve ~ Bell-Coleman cycle (gas ~ompression
cydef l Vapour .:ompressioo cvcle usmg
~p:~nsiot1 engine Codes
a h
;\ I 2
B 2 J
('" 3 I
c 2 I 3 lu the abSOtption refngcnnion cycle the cumpressor of tl1e v3110ur COIIIJlression refrigeration cycle is replaced by a liquid pump b generator c absorber nnd generator d absorber. liquid pump and genera101 The C O.P of a Camot refrigeration cvcle decreases on a decrea.\ing the dlfl"elcoce "' OllCl'allllg
temperntures b keeping the upper temperature constant
and incrcn.qing the lowr temperature c increa.ing the upper tempenrure and
keepin!! the lower rcmpemture constant tl increasing the uppe1 tempernture and
decreasing the lower Lempenuure Desen coolet'5 are sunable for hot and ~ery dry
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b I and 2 are correct c 2 and .1 are correct u I and 3 are correct
57 In a boiler, feed wa1er supplied per houris 205 kg while coal flfed per hour is 2J kg. Net eutltalpy rise per kg vf wruer is 145 IJ for conversion to steam u~ the caiQri fic value of eoal is 20,50 kJ/kg then 1he boiler efliciency wil l be a. 78~{, b. 74% c, 62% d. 59"/ci
58 IM degree. 1lf reaatiun ofa turbine i$ the rario of enthalpy drop in a mavi n~ blades to enthulpy drop in t~e
stage b. fixed blades to enthalpy drop in the.
stage ~ moving blades to enthalpy drop 1n
uxed blades d. fixed blades 1.0 enutalpy drop in
nll)vlng blades .59 With refotence to superSHtllrntcd flow
through a steam nozzle. which of the followiJJg statements are true7 l Steam is subjoined, 2 Mass flow rate i~ more than the
equilibrium rate of flow ' 111ere is loss in avallubilily 4 Index of e."pansion com:sponds to wet
s1eam condi li ons 'i Select the correct answer using the
codes given below Codes a. t. 2 and 3 b. I and 2 c ['and4 d 2, land -l
60 Consi;ler the followipg stnlemenL 1 A,lmoslllll now losses take place in the
diverging part of a no1,2le 2 ~om~al shocks ire likely 10 occur in
the converging pan of a nozzle ~ Etliciency of reaelion turbines is
higher than thatofi mp11lse rurbines. OF these state1nen~ a. 1 2 and 3 are corre
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3. Reeuperutivoo helllin_g is bettct limn re@enel1li!Ye heating in the case 01' air p(llheaJcl'!..
Sclcct lha COJ"TC\!l ouswco Wiiug !he. code! given below-codes: l . l .. nd 3 b. I Nnd 2 c.. 2 dntl3 d. l11Ud3
66. Motcb Ll.
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speciftc gravity of wood is ()6), then it will a. Ooat ln stable eq~iUbrium b lloat in unstable equnlbrium d floa1 in neutral equilibrium d stan 111\lving hori7tJ~tally
76 An inclined manomruer inclined a1 30" to the borizoolal, ,neaSllres the pressure ditrcrential bctweco two loq~tions ot pipe carrying wafer 1f the 1flruiC>mou1c llquid is mercury (specific gravity 13.(.\) and the maoometer showed a level difference of 20 em, I heo the. pressure head .diflerenae of water between the two tappings will he a, I 26m b 1.36 m c. ~51 m d :!.12m
77 An opeu tallk coutains water m a depth of 2 mlilld uil ovc1 it tn a ll~pth of 1 Jn.. tr U1e specific gravi~ of oil Is Q.8, then 1he
pr~ssure intensity at the interface of tbe IWo lluld layers will be a, 7R~8 Nlm' b. 872(1 N/m1 c Sl:l-17 N/m1 d 9750N/ m'
78 Consider rhe following statement;> For a body totally immersed in a tluicl. I !he wei&tn nels thro.u!\h 1hc cenlre of
gravity of the body 2. tlte up thrust acts lluuugb the cenlroid
of the bt1dy Of these sta1ements a, both I and 2 are true b I is truebut2 is false c, I is false bu1. 2 is m1e d neither l nor 2 is true
79 l'hc components of velochy u and v along, the .
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Atrnion (1\)! Just ~elbre anJ after collision, I he toiJII linear momentttm of tn 1111d (1'1 together i~ cunsencd Only an the ht>r:iZUJillll dirdirec~iC;>n . R.,,AQn (R): 1'he tOIJI I kinttie tmergy of m :~nCI .M tog.;U1,;r is not eonscrvod. :L .Both A runl R arc lnlo aud R i Ou:
corNet "-'lll:lrul!lon nJ' "\ b. Holh A and R ~re true hut R Y; n O! ~
com:ct explonntiom or A .;. A is lrtle but R is fal>e d. A "' folsc but R is lruc
85. Alismtion (!\): A cam and foUowl:l lm g Mhatls is unuVt!idnhle. a. Bi>th A Jntl R ore tme and R is the
i:Orretl txtllouotion of A b. Both A and 'R nro true but R is Mt a
con'ect e.xplonotion ol' A c A is tnoe bnlR i.~ fal~e II, A is folse hulR is ~'\'"
87. A~cr!Ion (A): Enduron.:o limit. ror oil mn1erials re alwy less than the ulhmate ~trengOo l!f the id toul lip arc t~roduce 1\ .m,J R are true but R tS not o
tim:i!l explnn!ltlon olf A c. _ \ is true bul R.is lhlsc d. A is lltlso: but R is lro~
'l I. As-C~ chrl L an 11id in studying inc ucltvi ti"l' nf' " !:fl'lup of' J)e(lll )" W()tiJng (Qge~\Cf, Reason (R ); Gong p tocess oharl ann lys"' the oyole or routine fullowed by each 111.cmber of the Sll!! u. Bolh A Ollld R are lnle nod R JS lhe
eo.rru\ll cnplnJ.Wtfon of A b. Both A ond R arc lrue but R is nol a
t:
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d. A is false but R Is true '13 Assertion (A)i FIFO rules for sequencin~
are accepted eas.ily by all as it appears fai.r to all Reason (R). Pll'O rule Is Optim un\ for most n~heduling sinations.
~ aoth A and R are ome and R i$ the meet e~ pl analion ~1 1' 1\
b B01h A and R are tnle but R is not e c.orrect explaoarion ol' A
c. 1\ is true but R is false d A is false but R is moe
94 1\ssertion (A). Aldtough a 'heat p\lmll is a refrigerating system, the coefficient of pcJfomJance differs when ir i5 opcmnng on the heating cycle. Reason (R) I Lis the condenser heal thu~ is useful (the desired effect) instead of th~t refri:geratlng effect ~. Borh A and R are true and R is the
correct e.~plan!Uion of A b Bo(h A and R. are true but R is not a
correct explanation qf A c. A is true but R is false d A is false but R is true
95. Assertion (At: Freon-12 is odourk-ss and its leakage canJiot ue easily detected_ However, it is pref'eJTed in eomtbr1 ~ircondl tioti ng f\eason (R) h is alm~JSt impoS'sibiQ tor Freon 12 leakage Ill nttain a fnlal ct)ncentrati\lll a Both A and R are 1rue and R is the
corrtct ~-pl anation uf A b. .Both A and R are true but R is nut a
correct expl an(!,tion vf A c A is tnte but R is fnlse d A is false bul R is truo
Qb Assenlon (A) A gas curb! oe power plant' ls WJY sensitive ro 1urb111e and compressor inefficiencies Reason CR): ln a gas turbine power plant. a lUQ!e portion of the turbine work is consumed by the compressor. a. Both A and R a,re true and R is the
cQr..,ct ll,'(planatioo t\1' A b Botb A ruld R arc .IJ'U~ but R is not a
correct c~lanation of A c A is true bui R is fulse d A is false bvt R is true
97 Assertion (A) For !he same limits of bo1ler pr~ure and ten1perature. the specllic steam constunpflon or ideal
I I u( IJ Cam01 cycle is less than that of ideal Rankine cycle Reason (R) 'Fot the same limitS of uoi.leo pl'\'!ssure and tentperaturo, Carnot cycle is more effiden1 than Rankine cycle a. Both A and R. are tme and It is the
correcl explanation of A b. Both A and R. are true bul R Is not a
correet explanation or A c. A is ll1.le but R is false d. A is false but R is true
98 Assertion (A): fimropv c.hange. for a reversible adiabatic process is zero. Reason {R) There is no neat transfer it an adiabatic process, a Bulb A and R are true and R is doe
correcl explanation of A b. Both A and R. arc trUe but R is not a
correct e~planatfnn of A c A is true but IUs fhl$e d. A is fal .s~>but R is ll'\11!
99. A unifom1, l1eavy rod AD of lengd1 L ru1d weight W os hinged ~~ A and 1].,0 to " weight W 1 by a string at B. The mass less string passes. over a frictionless pulley (of ne!!ligible dimension) at Cas sbowJJ iJJ llte.ITgure. If tlte rod is in eiluilibri um lit honzontal conti guration, then
!6\ l~ '\ B
,.....__l a. w, - w ll. Wt W/2 c, w,= ../1w d_ W1 - W/../1
100. A u.nlfonn boom AB (S~'e gtWit ligurcl pinned at A Is held by the cable BC In I he posmon shown.
~ A
If the tt'n>ion in the cnblt' is 200 k!\f. then the weigh qf the boom and ohe r~a~tion of the pin aLA on th'e-boom are re,spectively
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d JOfl kgP. 100 ./3 kg~ 30" b. 400 k.gl: 100 .Jj kgl~ 60 c. 300 ~a:l: 100 .Jj kgJ; 30" d. 4ilu 4;1', 200 .Jj kgl: oo
I 0 l A weight W is support~d h) t\1'0 cable$ tl!i shuwu in tlll.' (?iv~n llgure. 1l1e tensitm in
lb~ cable ntltking Mgl~ fJ will b~ the mmtmum 1vhen the vulue uf(J fs
a o h. Jll" c. 45" d. 6()0
1112.. An eluvurur wetghi11g I O,IJ(H) kgf :ut~ns nn llp\\urd WIO"I)' or 4 tu/s Ill tWO Se
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b. incompletely con&l111incd kinem~tio:s p:ur
c:; successfully constrained ldneuoali ll betl~ htall$~ or rt syros..:hpic ttdion b. Corio].,. occd"(1
