mechanical engineering objective questions part 8

7/30/2019 Mechanical Engineering Objective Questions Part 8

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c=====MECHANICAL ENGINEERI=N=G=======.l

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Co nsider the fnllo111ng chnracterisdcs ofrolllng process:I Sh.ows work hnrdemn g effectl . Surface fmish is not goodJ He:tvy r e d u C i i o t ~ in areas eM beobtamedWhtch of c h u r ~ c t r i s t i C S areassoctated with hot rollomg7a. I Bud 2b. I and Jo. :! :md 3d I, 2 a11d 3Which of the fo lio" tng pal!en1-mat cnalsare UJ PreCISion Cas ting'/I. Plasterof Paris2 P a ~ 1 i c sJ . Anodized Aluminum A ~4. Frozen MercUlySelect the correct unswer usmg, the codesg1 ven belt1w:a. 1 and2b. 2 al1dt 3 n d ~d. 1 alld 3Assertion (A) No machm e wou ldcontmuous ly-Rcason (R) Energy ca11 be ne1the1' creawdnor destroyed, bu t i can onlv betmnsforllled from one form imo tltlOther.a. B t ; ~ t A and Rare lnte and R is thecorrecle:


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d A is false but R is trueln free expa11sion or a betWl\en IWO"'luilibrium litates. the Wtld'- lransferinvolveda, can calculated by o i n i ~ t i l ~ two

s m t ~ on lr Y coordinates by any p3thand estimating the area belowb. can be calculated by joining the t.wos t ~ t e s by .,. quasistatlc putlt @nd thentinding the area belowc- is zerod. is equal lQ heat generated by frictionduring expansionl'wo idea l hat engine cycles are.represenwd in tile g;,e,n figure. ASsrtrttc.VQ= QR, PQ = QS nnd UP= PR = RT Ifthe w o ~ k interaction for tlte rectangularcycle (WYUR) i& 48 N 111, Uten the wvrt- - - -=1,08b. 0.7C, 0.648d l ,43

R ~ r i o ofenthalpy drop in moving blades tocnthalp.y drop in tmul lixcd andmoving blades iii calleda. Rehe,at factorb Blade eniciency

c Degreeofrenctiond. lmemal efficiencyM a u m blade c m c i ~ n c y nf a Parsonsturbine is given by {a. is no;zyJeangle)8

cos 'ab

tT

-atch list X wilh List V and sd e1.1re compressorListY (Processes)I. 1-22. 2-3J . J-44. 4-55. 6-7Codes; A B c Da. r 2 4 3b. 2 4 5 3c. 3 4 5 1d 2 5

S

39 The most efficientideal ~ g e u c r a t t ~ mpower cycle isa. Ran!ring cycleb. Carnot.cyclec. Brnyt


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a $low down tile neutrons produced iub. reduce nuc lear pollution~ C()ntrol the cacror temperature Sl.> tlmtprotons produced arelessd. moderate tle steru.o pressute to s lowdown the c h ~ o reaction,\ memllic rod of uniform diameter andl.cugth L connects twu !teaL sourcS each at5tl0 C',11e atm osphork tcn1penuure is 30' C The temprature gradie111 dT/dl at theceoue of the bar willl;>e

500a L/ 2u. 500L/2470- -. / 2d wo15. A c.uppe.r pipe carrying rerrfger;ml at -10''( ' is ('lJI'Crcd hy cyliudricw insdutlonof thennal conducth!y OS Wl111 K. Thesurfucc hem Ltansler coemc.ent over theinsulation is 50 W/m2 K. , .be cntica.lthickness oftbe insttlation would bea O.Ol mb. om mc. 0, lllid. O, l5m

46. Which one o.f U1 e tollowiog diagramsillusrrates the relation between wnperaiureC1') an d lcng1h (L) on a steam surtacc.coodenser'l

Ti---__,_-l(a) 1----.,_...J

!bi

L(c) Tr----......

48.

50.

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o ol 15(d) 1 1'---::::v-In a certain ideal r o f l i g e ~ t i Q n cycle, thecor or he:t pump is 5, The cycle underIdentical conditions running as bent euginewill haH: efficiency asa. zerob. 0.20c. I 00d. 6,00The IJ(>Wtlr (k\\1) IC(JUircd per tOll orrdftg,eration is N/('QI' where COP is thecoefficient of performance. then N is equaltQa. 2.7Sb. 3.50c. ~d. 5.25Match List I witJ1 List U and selectcorrect 81.Swcr:ListlA, Rctrigemnt I I8, Refrigcrmu 12c Refrrgc


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comes in conroe\ with air havins a drybulb temperatureof 38 0 attd dew poim ofQ c o,,e.r the cooling coi l, the a1r wuuldltndergoa, sensible coolingb cool ing and homidilianionc cooliog and dehumidllicatlond. adl abatlc saturationThe mam poeess w t!tkes t)laee in 11desert-cooler isa. seniblcb dehumidificationc, b a t i c saturationtl cooling and d c b w n i i l i c ~ o nA double U-111be manometer is connccte.dlO tWO liquid lines A aod n. Relevamlaigb ts and specific gravi ies of tbc lluidsshown in 1he given li,b'llre. Thepressure difference, m head of w ~ t ebetween llulds .at A and n ss,

s ,11. SAh - S,ha- SJha Sabab. SAhA - s,hu. s,(hA - hu) + SJhu -Snboc. S,hA Sthu S:(hA - hu) -Sr,hod. S"b" +Stba +S,hn- S"b"Consider tbe fo llowiug suncments:I Streak line Indicates instantanens

p o ~ i t i o n of particle$ of Huid passingl r o u ! t l t l l poinL:! Streamlines are pa ths traced hy n nuidparticle with constantvelocity,3. Fluid particles cannot cross streamlinesirrespective of the type of flow ,4. SITeamlil\es converge as the t1ttid tsacce.leratcd. aod diverge whenre tardedVvhtch ofmese.statemems .are correct?a, I and 4b. I 1und 4c, L 2 a n d ~U 1.OTtd J

ss

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7ur ISIf the diameter of a caplllary tube isdoubled, tllt>


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a. i11let on the.concave side of he bladesb. c:>U tlet on the concave side or the a d e ~c. otnlet on the o n v e ~ side nflhe hlndesd. inlet on thconvex side of the bladesIn bydraul c power-gencrru.iou syslellls,surge tanks are provJd;:d It> preventimmed iatedamage toa. drafttuucb turbine~ tail raced pent1 I (1'ert1lS ) with List II(Definitions) and select thecorrect answer.LisUA ModuleB. AddendumC. Circular pitchUstll1 Radial distance of a too th fromptrcb circle to tbe top of the tOOth2. Radial distijllOO Qf a tooth from tlnpnch ci rcle to tbe bottom o!'the toothJ. .Distance oo the circwnfcrcnce o[ tltcpitch ci rc.le from a poin t ofone tooth tothe c o r r e s o n ~ i n g point on tbe nexttooth4. R;ltio ofpitcb circle diwuettr in 111111 to(he Jllllnber ll f teethCodes ;

Aa. 4b. 4

BI2c33c. 3 l 1

d 3 l 4In a hydrodynamic journal beadog. there isa, very thin film of lubricant btt\Vcel1Ihe journal and rhe beaming such thll1there is comact between the journalaod the bc;ll'lugb a thick film of .lubricant between the.journal and tlte bearinge. no htbricant l l c t , ~ e c n j ournal andthe bearingtl a forced lubricaol bet1\oMn the journaland tJUl b'earing

The stifl'ness of spring k used in thellanuelJ governor as shown in tbo glvett

h ( ISfigure {Ft and F1 centrifilgal forces atmaximum and minimum radii uf rotationl i and 12 reopccrivcly) is'r K.la. l ( ~ n ~ ~ - Jtt f j-r=b l( - F, Jh lj _ ,:.o. 2l J( 1, I;)u ll l jd. n ~b t, r,iS5 , The balancing weights are introduced hiplanes parnllel to the plune of rotation ofthe d i ! ! l w b i n ~ ; mass. To obtain complete.dynamic balance. the mrnfmum number orba lancing w e i g h t ~ to be introrluced indi Tereut planes isa. Ib. 2c, 3d. 4

(){) Consider the following stalen\entsThe unbalau ced force in a s i u g l e - c y n d e rreciprocating l!llgine IsI eqoal to inertia force of thereciprocating masses.2. equal 10 gas force3, always l\ally balancedWbich of he st.atemeJU(s) is I aJe o r ~ e c ta. I l o n ~b 2 alonec. I and 3d. 2and3()7 The equivalent >'Pring stiffness for thesystem shown in the givcm figure (S is thespnng s t i t f n e ~ s of e.aoli (>f the threesprings) is

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s sRls 'ds b4 r

w sr-b. S/3c , ~ S I - ld sCon!iidl;!r 'he fo llow ns ~ d u x J s1 Enetg) mollo(lrl&1ullibnvm mclhodJ Ruylcagh:; met hodW h ic h or t h ~ mctJ1oW. ctt.b be: w.OO t\'lr

c n : n U I U J ~ tl1c: natut"ill frt.tqUOUCI)' o r th ef'n:e ' ibrauon:r!o , I an d 2b, I ! nnd J~ I 11nd 3J. 2 :Uld 3ConSidc:.r tOI I0\\ ' "8 stnu:menlS:In forced i b - m u ( l t l . ~ t:he bod_y Yfbmre.sunder lh e influence ofnn p n 1 i ~ forc.el In damped dbmtiOns. nmJllit ud e

red uce s Q\ 'cr-.:ovcry cycle Qf v jhroti()nJ In 1msionnl \' ibrndons. the dise m o v e . ~pu rullet "' tho ul


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m lf the vertical height of the poiIl l ofauachmcnt of the load is 12 n:t, force.nn the tripod leg woo ld bea. 37.57kNb. 40 kNc. 43 3kNd 46.() kl'l76. Tbe g1Vt'l1 iigut't slu;>ws the loading pall'lnJ\111" r u ~ s . The fowe in the tne.rnbor AC is

alL D l ~ t F-1.41 Hl.1l.tJ)ff'Vla Zeiob. 2Lc. Std statically indeterm inate71. l'wo pieces ursteel and brass weighing 20N and Iu N rl.'l>pcctively fa ll freely underihe action ofgravity fTom a tower For thetwo pieces which one of thefollowinJ! wiUbe equal afl\r falling and equal drstanc.e?a i\ccelerationb. Momen tumc. Potential energyd Kinetic energy78. A simpfe pend'ulum of length I bangs fromthe ronf Qf a tram mov111g with uwfonnacceleratiott a. !hen in the equilibriUinposition the penduluma, IC!lns back from Lite vertical by nuangle tan I (g{a)b. leans back from Ue vertical by anadgle rao"1(afg)c moves forward from the vemcal by anangle (afg)d. move forward [rom U1e vertical by anangle tan' ' (g/a)

79 Two masses, 2 kg and S kg. tLTe movingwith equal kinetic enecgy The ratio ofm a g n i t u d e ~ of their momentum isa 0,25b. 0.50c 062.5d 1,0080. Crushed ore is dropped on a conve_or be ltat the rate or30() kg/s The bell moves atspeed of2 m/s. The net force acting on thebelt tha t keeps l t novingat tiLe same speedis

a. JONb. 60Nc. lOONd, 600N

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81 The lengtlt or Jhe ehestrexpander springwhen it is uoscratched is


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a. [ 'fb [

c

d [ ~

0,,yCl0

1/)'n0(11'II0lfJ'0

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~ )q_l85. Assumong E= I60 GPn aud G= I00 cll'nlora matcnaL a strum tensor ISgiVen as

(o.oo2 ooo.1 0.006)0.004 0.003 00.00!1 0 0

I he shOlid shan Clltnpres.,cd hy as!ttunk fit bub l!i ns (0 - Origm un.J C Centre ofc1cle: OA "'O't ond 013 '" 'O'll~ ~0&.-(c) OHf'\---t - - B\.::._}A

ll\1 A steplx:d ~ o l t d ~ u l n r shaJ\ sbown '" thegiven. figure 15 built-m ut liS


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"=Ji!a, J l I,b. J ,J , I;c. J, i l

J=" 'ld J, . ,,J. I.

Stct\1 shall and brass shaft l l f same length!IJJd l l i a m ~ t c r we C ( \ l l n ~ t e by a nange.::wpJIn,g T ~ e assembly is r i ! , ~ d l y held at1LS ends ;llld is twisted by a torque throughthe cou pl ing. Modu lus of cig!dity of stceJis twice that of brass, If 1


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tul>ulllr wo rk piece is supported wiih lhcgrlndlns wheel within the tuhc. whereinI. Utt: ).lrindins wheal. ll''lt'k pie1 metal removal mtc2. Poo r surface (iotish3. Uiglt tooling CIWhich of lhesc disodvanUtges :u-eas'soci.oed wilh 11 lrrasonic macltin(USM)?II. land 3b. I and 2c. 2 and 3d. I, 2 and 3Ill(). Match List I (Welding 11rocesscs) with List11 lf'e.,lllr"") and se lect the cooT""t onswe1;L.isl l.-I.. UltrasotUc weldingB. filcctron m weldingC. Plasma arc we ldingList UL Gas boated to ionucd o d i t . i fortlunduetion ofoloctrii! cw:rent2. High l'requenc.Y nnd high intensity

vibnll iOnS' Cuneenttaled I I C 3 U I or higlocuetgyc l e c t n ' > l \ ~4, l t ~ < l l h e r m chemical r ~ ~ m

C Q < l e ~ A 13 Ca, 1 2 4h. 4 It!. 2 Id. 2 Illll Milich List I ( P r o o l with LiKI II(liu itsht. c : l ; ~ t : S ) and $lccllhc correctList [i\, Connec1ing rodsfJ. Prc:!;Sclrc vesselsC .Mllcbiue l!>o l bedsD, Collapsible tubesLl U1. Welding2. E. titus on3. l'or!!lng4. CastinsCodes: B c D I 2 4 2b. I 3 23 2 1d.

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IU2. ?v!tltcl! List I ( Q p e r i l t i o 11ith L i ~ t II(S tre.>set induced) ami select lhc corre"t3 1 1 ~ \ l < : f

1(13

104.

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List rII , Blanking13. Slreteh fonnmgC. CoiningD. Deep drawingr .11 uI. rcnrion2. Compression3 , S hearing

~ ension nnd cnmpre" ionC(tde!!: A B C D~ 2 1 3 4b. 2 4 3 1~ 3 4 2 1d. 3 ) 2 4Motcl! List l (l;oJg i:ng o p t T a l i o ~ ) with l..istU ( O e s c r i p select the cor.rectons\YctListlA FlllenmgB JJrawmgC. Fulle1 iu11oD. Wire draw insLi.t If1. Tltkkness 1s reduced con tittuously atdilTCJ'om sections nloug IengUt2. Metal is di>placod awy from ocntre.

r e d u ~ i n g thicknes in middle ond m< . - r e lenglh3 . Rod is pulled u g h ~ t.licI. Pn:s.;ing a work piece between IW\l OUtdie!!C'


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3. be relieved of all work that 1:11n bedOn< more advantageowly by a jig.fisture or lilcrolcd de\ iec.Which . , e ~ l u t e u t e u l ~ ' " ' COtr U . ~ C dM row m3terio l

~ d ~ A B C' f)11, I 2 3 4h. 2 l 3c.. I 2 +d. 2 I :t +U3. W/udt the foUowing condition\Y1fmn1s that businCS$sho11ld be d o ~ < : d

Fln t "V3rinbleCIJIIIr vehicleh. t r i n l vehiclee. a ~ e y o rd. RoO,. cooveyotI N R()pc ltake d y n o ~ m o m tt

mechanical engineering objective questions part 8

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