mechanical engineering objective questions part 7

7/30/2019 Mechanical Engineering Objective Questions Part 7

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IC.S.l:-P re 2000 I of 13MECHANICAL ENGINEERING

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Consider the fo llowing statements :I Oases are considered fncoml>ressiblDwhen Mactt number is less than 0.22. A Nt:.>'toniau Aufd is iocolllpressiblc

and o n ~ v i s c o u s3. An ideal fluid has negligible surfaceten,-ionWhichof these sratemem(s) l.slnre correct?a. 2and3b. 2 alouec. I alonel l I an


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A List lB Ori tice meterC. Broad crested weirD Pilot tubeE. Rcyramerer!Jist III Measurom en t of tloill fn a cJ1annel2 Measurement of velocity in a pipe/channel3. Measurement of now in a pipe of any

inollnationMeasurementvenieal pipeCodes:~b.c.d

AJ3

BI''I3

of upward [low in u

c 04 22 424

42Assertion (.A) rnvers ion of a kinematicschain has no et1eat on the a t l v e motionof its l. inks.Reason (R): The mo1o11 of l i n k ~ in a

k ; n e m a t i c ~ chain reli\tive to some mherlinks is a property of the cbaio and is not0Jal of the mechanism.a. Both A ruJd Rar 1:rue and R is thecorrect explanalion or Ab. Both A apd R are true but R is i'IOTthe correctexp lanation ofAc A is true but R is falsed. A is false but R Is trueAssertion (A). While transrnlttlng powerbetween two paraJkt shat1$, the noisegenerated by a pair of helical g e a r ~ is less0Jan Utat of an equivalent pair of spurgears.R ~ (R) A pair of helical gears basfewer teeth in c o n t ~ c t compared to 1\llequivalent pair ofspur gears,a. Both A Rare 11ue and R is the

correct explanation of Ab Both A and R &re (roe bnl R is NO'rlhe correct explanation ofAc A is true but R is falsed. A is false bu t R is trueAssertfon (A) 1 T and channel secti()IISae p-efetrcd fobeams,Reason A beam cross-section shouldbe such that the greatest PQSsible PIIIOUIItofarea isas tar a.way frpm the n ~ t r a 1 ! X i sas possible

:' u! IJa. Both A and Rare troe and R is thecorrect e:scnlon (A): In a simple hannonicmotion, the potential enerw reac-hes itsmaximum value tWice during each cycleReason (R-): Veloci ty becomes zero twiCeduring eacb cycle.a. Both A and Rare tru and R is fhecorrect (!)(planation of Ab Both A and R are tn1e but R is NOTthe correctexplanation of A

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c. A is true but R is fal>cd A is lo but R is trueAs"'tion (A): Tllt:otllc .govculingll11:rmodynamically more ~ f f i c i c n l thonn07.Zh!


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,,, Both A R:m: ltUe nnd R is theCllrtecl explnnntion ofAb. Bolb A 11nd R are true but R is NO'!'Ute c o r r ~ c x ~ l a l l J i t i o n ofA.:. A ~ true but R is false

cL A i. f11lse but R is25. A..sertion (A): The Rankine cycle with

~ e n e r a t i v e teed heating h> r e a ~ 3re U1c one!lwhi"lt do not meett u pointJ. A single forces may be reploced by foo\:e :Uld couplWhich IJfLbC!Ie lntooncnl.\1 M'C corrtl?n. 1.2nnd4h. 2. hnd 4c. I. 2 and :;

d. I. 3 ami429. Wh.ich one of the following statements i>CQn-.:c t1a. Energy und wor.k nrc J a nb. Fooceand work ore vectorsc. Energy, momentum aud \elocity. are

vectorsII. FO


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1875 kWd. 300() w35 Principal stres- m n pomt rn n siTessedsolid nre 400 MPa nnd 300 MPnrespectively , The normal s1rcsscs 011planes mrliood ut 45" 10 the pnliCif'a lplanes will bea 200 MPaand 500 MPab 350 Mf'a on bmh planesc 100MPn and 600 MPacl ISO M P ~ nnd 550 MPa

36. A Mohr s stress circle s drawn for n bodysubJected l


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11. G u J 0 1 fonnula holdi good only forshon cohmmsb. II shon column Is one wh1oh hasrnlio of it s Jengtb to leas! rndius ofgyrnlloli greater chan J00c. A column wic!J both ench fixed basmm imum equivalenc or eiJcctiwlength


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To carry ct large axia l load i11 a flat collnrbcming, a.number of cullnrs is provided toa. reduce lhctional lorqueb increase frictional lor59.

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7 ul IJ(k is spring. Sliffucss. m is mass and m, ist

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The correct sequence ill incre:l!ing orderof the range ofculling speeds for ophmumus.: uf these ni>tcria Is illn. .. 2b. 1.3. 2, 4c. 3. l. 2. .Jd. 1, 3, 4, 2

():1, Tn 3 huping O p Q r . ~ t i ( l n thO overage cutting~ p e e d i (Stroke length S. Numbl'

S p < o e i f i c l l l i < > ~ ~ SlAY'>-L-7-R.-23, l!Siug tl"'~ t l l q d ( r c l o l s t h o n n m e r i ~ cndificnlion:I, Abrasive nsed 111 (he wheel ,stlluminlmn oxide2. 1 h e ~ < i u s i z e u f b r a s i v e is medium

'11tc wheel grade me.Jium hard4-. h bas 4Jl open strucitiJ'cs. nbil$ resinoid as bonding agenlWhichoflh"'e statements ore o r r e d ~11 . 1, 2on

65 . Dicection>l .solidification can be aahiewdby providingn. chills nod chaplet!1>. chaple13 and p;tddingc. cllills ond podding11. s 1\'tlllthe $pindle o;sn'ierWhich of these features life chataeterlstlcsof a muhispmdle ;iUtOmatic machine usedfQ1 b3t W O t ~:.. 1. 2 and 3b. I And 2c.. 2 nod 3cl , 1and 3

11. C ' - o ~ i d c ; r tbe t(lll()wil\8 m ~ n i s mI. Geneva georing2. Roeh nnd pinion3. Rtehet pawlWhich of 1 1 1 ~ moc.I1Jnisms are usoo lo

i n d ~ Ute work toblc on a tran.Uermachine? I ond 2b. 2and 3c. I anu 3d. L 2 :md3

72. CONider tlu' iNIO\\ ittg proecsSCii:I. Mcd1nnical J)U iv


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S

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a. thermo sets aloneb thermop1


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b.c,d.

2323232

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8:1. Consider the following advantages:I. Very lle.,ible2. Simple to under.!lnnd3. Det.oilt>i operation onn be visualf>odWbid1 of lhcst> arc ilie advantugcs ofmaster scheduling'/a, land 2h. ltd Je. 2 o11d 3II. l , 2 nold 3

84. AD- is compressdd adlabulicnlly in a o a d .flow proce with l i g i b l e chnnge iiipotential and kinetic energy. 'lne workdone in rhe process is given by,,, -f pJob. - fpdv"' f dpd. Jclp

85. Wbtoh one of the JoUowing p r o 1 > e r t i ~remains unchangl'-'lnonlson proct'M'Ir. Temperomreb. Gnth.1ii>Yc. E.ntropyt l I'rcsurc86. lu oespect of o cilned sy.tem, wl1ou auideal gus undergoes o n:vcrsible isotbonunlprocess. thoa, h e ~ t tnoJUiti:r i W ()b. chauge in Internal energy is equal to

wurk lrltllSf"r\VOI k l r a u . s f ~ is LCtu

cl het tlnulcr i>cqun ltt,> vntl..ttonof


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1600 kJ nr eOef!!Y IS lronsferred (rom 8heal reservoir at 800 K til unolhcr beatI'I!SeTVU' 11 100 lC.The ouwuut of eutropyguld bea. 6k .Ilkh. 4 kJ/kc. 2 kllkd. wroT. KBOO

400

7 M 3. '. '. :' .'--..---- -----....1

1 :5 S, kJ!kg-Krhc lhel1.1lal cffioicnoy of Ulc h.YIX> lhctical

henl engine cycle shown in !be gi1cnliguru isII . 0.5h. 0.45c. 0.35d. 0,25Mntob list J (Cycle) with Lis t II Wrocess)and select tllll O oonstnnlvt'lume2. Twn iso tl\ennlll two iSI>UI'3. Two i>"en lrol>ic and tw >sobar4. Two i s ~ < n t r o p l c and two C tbemmlCodes; A l3 C 0A 4 2 3h. 4. I 3 5~ 4 2 5~ 4 5 3The spccifio befit Cp is giwn byn. r(av1JJ)b 1' (ill' ro),c. r ( ~ Jar),d r(ar ' rv),

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I I of l396. The ciroulahon ratto for once lhrou!'.bsteam g""c"-atms tsa. Ib. 2)1);b. nl port load conditionsc. alxwe criucnl pressure ratiod. u1 u.U ~ d e s i g n conditi1msSteam ctltcrs the rotor of u rcuctioll lUJbiucwith an absolute velocity of 236 mls w>dlhc rcU.tive vel(l(lity of 132 m/s. It leavestbc rotor ll'ith rclHUvc vel(!City. of 232m/s and a.bsolute velocity of 126 J11/s. thespecific work l'ttlpu( tsa. 36.3 kWb. 40.1 kWc. 43.8 kWd. 474 kWIho 11 (>rk nutp11t frnm u e a ~ t i ( ) ~ w h i n o

SIHI!,C js 280 kW por kg/s of stUUnL If ihe,(>7-Zlt efficitnc) ().92 uml rotor

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eftlciency is 0.90. the i:scn tropic .stnliodrop wdl ben. 352 kWb. 347kWc. 338 k\Vd. 3S2 kWIn siCilnl l u r b i ~ e . the n ~ t n l p cN P inthe tixecl bltcde 11nd Oltmoy not increasewith years of serviceWhich of hese$blemenls m: correct'/ll . J,2 and3b. 2, 3 and4c. 1, 2 a n d ~d. l, 3 :utd 4Which onu of the following types ofnuclear reaclnr DOES NOT i r e ~ heatex:cba11ger?a. 13oiling W41brb. Pressutie


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n. O.SKWb, 0.67kWc. l .S k\Vd. 3 kW

112. The rcJiigdr1llll l2 (R-12) used iu V3jlOuroomprossion r ~ f r i g c . r . ' l t i o n gyslum iso.. CIICIF1b. C C I ~ F :c. CHC,Fd. CCLF1

113 An exp;on&on valve ffi not used forreducing pressuoe in Uoo>n. vapour compression relliger.tion C)clab. vapour absorption rdngeraLion cyclec. steam-jet refiigention cycled. s efiigemtion cyole

I14 The 1\mction of 3 cornpreuor in vnpourabsorptionsystem is.performed by d1ea. AbRorberb absorber and pump.: . llUmp ;md gen.,..tord. ~ b $ o o ' b e r . pump & g1.11erutor

115. Consider Ute following $tlltemcroll!:In a r c c i p r ~ l ] n g compressor. clearanceis pro' ided1. so thnt piston ili,>es not hit and damagethe va lve.c.!Ounl for differenti11l thermaleNpnnsion ofpiston 3nd cylinder3. to account for mnchining tolerance.

mechanical engineering objective questions part 7

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