Mechanical Engineering Objective Questions Part 10

7/30/2019 Mechanical Engineering Objective Questions Part 10

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I . ~.~.- P r e2003 I I of I I~ ~ - ~M E C H A N I C A LE N G I N E E R- - - - "N_ G~ - ~ - 1

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The figu re shows a ngid body oscill atingabout the pvot A. lf J i ~ mass moment ofinertia of t h ~ body about the axis ofrotation. its natural frequenc y for small

oscill ations i s proportional to8 . Jb J 'c. lfJd.. I . [ jConsider tbe followi ng t n le m e n l~ :Two rotors . mou11ted 011. a s l r ~ g l esbafl. canbeCQosidered to be e qui valem to a geared-shaft system having two rotors providedI t.he kinetic ene rh'Y or the equfvalent

system is equal to ~ t a tof Ihe originalsys tem .

2. iJte Slratt1 cnorgy or the Ct(uivalentsystem is equal to tha t of Ue origi11alsystem

J , Lhe shaft diame ters of Ute two sys temsarc equal.

Which of these s ta t e m e n t ~are correct?a, L2and..lb I and 2c: 2 and 3d I and 3

; 1 m 2 m !:;

The reaclions at tloe ogid suppoo s at A andB fu r the bar loaded a ~shown in the figu reare, respec ti velya. 20 /3 kN . 1013 kNb 10/3 kN , 20 /3 kN

4.

5

6.

7

c. 5 kN. 5 kNd. 6 kN H NThe bending moment ror a loade d beam isshowu below

vThe loading o n the beam is repr esented bywbicb ona oftbe foUuwing diagt ams?

( ~) ! f L l l l t l

( b ) ~( c )~(d)

1 1 1 1 1 ffTn a loaded b e ~ 1 1 1under.oenllinga. botb the maximum nonual and tlte

maximum shear stresses occur at U eskin fibre.'

b. both the nwb . sc . 4d . 2Wbich one o r the following pairs is notcorrectly matched?

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ll Slenderness The rati() of lenQthof the column to the ratio leas t radiusof gyration

b Buck ling, The ratio - oflll1IJ~ t r a i n

On a plane . resultant stress is meltned at anangle o f 45 to the plane I f the normal$tress ~ J00 i'lbnm 1, the shear t r e s son theplane isa . 71.5 N/ mm0

b. J(J() N/mm'c, 86 .6 N/mm1d t208N imm1A s teel rod I0 mm in diamete r aod 1 mlong is heated from 20"C to 120(' , =200 GPa and et = 12 " IO"' per c lf therod Ts not free to ~x p a n d. the thermal stressd e . v c l o p ~ disa. 120 Ml'a( tcnl'ile)b. 240 MPtt ( tensile)c. 120 MPa (


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19.

1\. P IAst ioo-f l . l"ru;t imn (medium)C. S lllinlc:S.qtcclD, AJutu iujumL;.t Tl ( RUIQ


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~ - noldlng tl>C .ffinll punch In the prr,perpos ition

( ' odes :.\ D C D

" 4 3 2 I~ 2 I 4 3c. 4 I 2 3J. 2 3 4 1

2S . "l'he cimtmu ity equation in Q ditlCn.'tltinJlilr'm i:r:1. !i!_ ~ I !t!_ - c:tJIIStMt

d I ' p-~ Jf I Ib . .J:. . . c u r ut u u tM dV .Jp

.:. ' " ' riV " ~ '- 1'1.4 I ' f '

t.l. . !d4 l eW p t l j . !~ O

26 . 26 . Velocity defect il1 1Joundnl) l)'llf"

theory l .tef1ned ""ct. the: crrur m the mcll!!Un:mc'n l ul'veloci ty .1t any JX!inl in the h,>ui>dar)laver

h l h~ clitrerence between >he ve luclly " ' point within lhc boun(hr) lg) cr nnd the.rr.,.,.stream veloci ty

c, Ute difference between tbc ve loe>ty otany point wiUnn U1e boundary layerand i h ~\ clod I nea o't:r the bo unda ry

' l ibc ~1 ti o between ibc ~ l r > e i t ) t poi ntin lh c boundar y layer and 1he Crc:i:

stream ve l'X'i ly27. 27 . Whlcll o n ~of lhe following stntcments

is con

d. Ro t"'31), Mo lclo List I with Li51 U ond liOCIthe

com:clanswer :List I (Basic Ide:tl F low)11.. S u pc t p o~ i l io n a r un ili>rm flow over

d011bletB. Superpofillou o.f unlJom1 Jlo11 over a

&o un:.e and 3 s in k

C. SupCI'j>OJWon of o un iform flow o1er JO H N:eD. Supdrpositlon of a free vorte.x Oow

nJong with ll unifo rm flo\\ over .adoublet

I isl ll (E:


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42 Asertion ( . ): Cltronocycle graph 1.1useful1n sc:thu g th e dln.>ction as we ll ru. ~ J > e e JoftM mO omelll o f U1c hum an b b d ~e lc.:m c u l i ,R e ~ $ On (R ): A Ncord of pafh of mnvementi at'fcclcd hy continuous snurcc nrl i g)lt: ~ , BoU i \ aod R a re true nod R II Ute

correct e,xplonat ion or \h Fkith llh i)Vc the h)'(ln ulic: grsde line Jttll Isnlwa )" p3nUcl to lLRcnliQn (R) ' ll>o vertic) diflt ,renccbetween energy gr:oae line oml hydrnnlicg r ~ d eline is il noll h econ'Cet eJq>bnatlon or A.

c. A is truo but R is fol"d, A is false but R is true

44, AssertiOn t A) : W:11er will lheze nt allitlher tolllJllratu i'C> t f the pressure i1>irn:rea s cd .

fU. . son (K): \\.oter e'n orAh, Bnll ! I und R arc U'Uc b ut R i ~ not thocon'CC!t ~ xp l o n ot io norA

~ A is true but R !'! f:tLtd. A i f ' l~ ebut R is true

-15. A ~ se r t io n (.-\ ): l3)'Jl3S$ fa1t!r vf . ~ Or tl m&lccl'l:!ls_c with lh:ll1'ce iu r,., vclt>city.R e o ~u n (R): Air gets more time tn : c~ n t oo tthe: cooling coi l ot low er f.1ce ve ltJcity ,. ~ Bl)th A ntl R = tru" anti R is the:

oorrue l 4Xj)!Anotion o}f Ab. Bo th A and R are true b tJt R io not tlle

"" rm!l c:Xplmation of A.:. A is truo but R i> l111secL ?1 is r lsc bot R i true

4(). A'"ert iot (A); H e;rd lo (or ~u d de 1 1expan:don IS more Ut : u l the hed l oss [Qr s_udd.ll ~ e u l mc l lo n ror the .same dinmo

6 " ' 14with sudd.en expamion or uddencont= tloo.~ . fll) th A and R 3re ln l c ond R 11\c

Cuo t t t : . ~ :p l o n a t io o Of t\b. Bre true hu1 R ; . not the

I!On'Cc t expb n :llion ,,rA" A i ~true bu t R is fa)>ed. A ; , fob'Cbut R is ~u e

47. l: o nider the following rn l l c~ i g n ~ On ~i d < ' !' l ll il l l l ~ . it is

always a dv n l l ll l cu u .~ 11 J>b ~c c.lls1 "" 'ribM-c:. I ll1l d :;d. I. 2 anJ 3

-19. 1\.f td t Li>t I witll Lun IT nd c le"1 tloec:nn -c:ctumwer :l,ist I (fvlc


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d. J I 2 ~ 50. 50. Consider the following stateLncnl!l:

51

52 .

S3.

I. D l ~ t o r t i o n - c n e r g ylhoCII) is in betteru g n : e m ~ n tlor r e u i ( : t i n ~the f i l i l u r ~ofcJuL'lile materials.

2. Ma.,imum nonnul ~ 1 r e s . ~thcol) givesgond prcdicuo n for the fuflurc ofhrill lcmaterials.

3. Moduli o r ehts ticit) in 1r1siou uttilC'\mpressinrt ore DS>tl nl:SS nno lys i ofcurVed benms.

\Vhicb u f these s UtiCillClliS is/urc CUITCCI?a, 1 2nndJb. I and2c. 3 onlyd. l und 3

+-- - - .,

.:.t.ON 1 t

A tlitTerelllilll pu!Jey is ,.-ubjectctl to belttensinns u . ~ sh011n in Lite dfagrnm . "I heresulting force und momcn 1 whenU1llttemd to tltc centre of tlte puiiC) nre.re;peCLiWI)a, 400 'N :utd 0 Ntnb. ~ 0 0N and I00 Nrnc. 500 N ond 0 Nmd. 500 N .md WO Nm

p

100 ""

Tbe fi1rcc F such thot bmlllhc burs AC andBC (AC' and BC' t W L'


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n. 1. 2w1dJb. I Wid 1c. 2and3d. I onlyWhich tllle uf l.he following is au e _ x u ~ tstraig ht i n ~mechanism using lower pairs?t1. Wuus mechanismb. O = hopper o1echanis m~ . R o h ~ n < mechnni. h < lr te . ~Lnnd the longest link s i~ ~~ ~ than lhosum or leng ths of the o ther t\1o, i1 isknown as Ornss ll off s Unkage .

3. It ; , possible 10 htwe the sum ut' l hulengths of the sboL1est and the lunges!links greater thnn thai of he remaininglwo links.

Which of hese s tatements osrarccom:ct 'la L2and3b. 2 ;!ltdJc. 2 onlyd. J o nl ~r he height o f wn u ' s gow mm Jsn. d i r e ct l~ pmporli


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68.

69

70.

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d, 30 3 Jl l iSOldllnnl"s couplin& is nn il.-L'fSinu or thek i n e m a t i c ~chain used inu. Whfl"onh quiciHc.tum m ~ c l l n n l s mb , Elliplicn l lrnmmelc Rfllflryeng inetl Univenml juiltlIn balnncing of - ; \ < tr Q k ~ott-l ine C tgmes,firing onkr he lps to conrrollhc magnitudet:\fa . Pnmar} lorces

gtvcn belo\\a. I and 2b. I 2 and Jc. ) a n d ~d . I nod 4AJ rollnt ICJI1 j)Cf( ll t t rC , which UIIC ur thefollowing IS the correct sequence o (incrcnsing hardness of he tool mntcrillls'!a Cas tnll o) - !ISS C e n u n l c ~ C n r b ill. HSS- Cnsr alloy Cemmic Carbide~ . HSS - Cust alloy Cnrh ide- Cct4micd. C n s t n l l o ~ llSS CMbiJe - Cc11mtie

""'!"!t-Titc lool life curves (or two l ~ o l sA und aare shown ln the ligurc und chcy fo llo\V thelool lite cqunllou VT" C Constdor thelo llowing staccmentsI. Va lue orn for both the roo s is same2. Value o( C (ur both the IIIOIS tSSnme3. Va lue or ( ' fo r tOOl A \\ill he 11reatcr

chon lhat l'or lhc 1001 ()4. VuJuc t>( C for too l ( j wll) be llfCIIICr

than tbnt for the tool J\Which of th.:se statements is/are correc t?a. I 11nd 3h. I a n d ~~c. 2 onLyd. 4 onlyAs the cutun g speed iucrilUscs

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''" more heat " l t ~ n J m T u e d10. the workplece an l r a n ~ m i U e d10 thelOIII

h. IUOI'cl >nSWtrLi! l f (CostElcmcu t)A. Di.countB, Prep.ratihli nf the m#chinc for n

produ.:tC. :-J'egolllltions. with w nJ orsD . Romt fur the warehouel.islll (1'ypeof Cosl)l . Ordering cos12. Mlllc-ri.1JQOSt

3 . SclA ip cost4. C;nrying


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d, ProducllayoutliS. M 0 1 i t 1 1 1 ~Qf Hmbs are 1hruughI. Elba"2. Fing


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93.

95.

~ I . 3 Qnd o1h , 2 on d ~

I 11nd 3.1. 3 ond4The b e . ~ tg e n e r nl ~ t l In metnl ou tting canconvonienUy be determined bya. insL'Illina tJoannocouplc on tbu job

h instoUing thet111ocoul)le rm he too lc ls" constan tfor a gll> indicate5 tltat U\e

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n.. m o f , . - c . l ~ol the gaJj hove $mallerdiameter

b. gas can b.: eaSily liquefi.:dc. gal bighc:rmolecular weiJ!,hld. gas''""'l o 1 ~ e r.nole11ciglll

103. Co nsi der o.n actual rugun\!1'3 t ivc Rnnkinecvc le with one open l'ecd water he.1ter. l' or

.;c:b ~ steam entenng .U1e m r b ( l l~.. " ' kgsWl!m w i t h ~Spl!le < ~ l l e d

a. Scavenging proce$Sh. O e ~ ~ e c r : tt io n p r ' ( J c e s ~c. !;xl,.,ust p r o c ~d. C on de n ~ a t i o nprocessWhich of the followin g tclntionijn1ust hold

rur ttn irrigation &I w o ~ od i m c us io n l 'l

tlow jnUu: >< - y pl>ue'lin Vu

a. - - - ==- 110 ex

b.ihl i/wl

- - - - -11{) ; t1x

"'iJw iiv- - - ~ i lQ,> o:

d. q., = I I~ UJ'

The cncffioie nt nf (iiclionsheur -stres$ tc, is g-Iven hya. r= rv"ZTb. I'= to 'I" ;c. f = llpv 1

d. 1= p ' ' ~oVclvcliy d L ~ t r i b u d o nnoound ary lnycr followsa. Log.uitlunicJawJ,, Pmboli c lawc, l , . l n e ~ rlowd. C u b i~ lnw

i ' n lerrM of

lilrbulenl

P a ' f o r m n n ~ coro r ~ ~ ois x p r ~s c db y

a. lsolhcmml ww kJnd i


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113 C n o ~i d e 1 the lilllowingsuuomonts:If llllliSI uir is adiabaticu lly ~ at u r n t e din onflir wt(l;her thanI wc1 bulh t ~ m p c r u t u r ~oemums ~ ~ ~ ~ ~ t a n t2. relative humidit) incrcn>es3. dry bulb l ~ m p e r a l u r e d e co' e l ! S t : S~ . buroidil) ratio decrcasas\ V h i ~ l tof h e s ~statemenls are correct?,,, l. l a n d Jb . 1 . 2 n n d ~

c. 2. 3 und 4d.. 1.3 :wd4

114 / \ solid r ll OfiLS With half of its volumelotunetS

b I : Jc. 2 : 3d. 3 : 4

11S . Which one llf the f11lli1Wing is the mo>tlmportnnl function or ll l e r m o s l i l h ~cxvansion v al ve ~:1. 'l'o control tltc degree ofsu pcrhc.utb. To o n t r o l r h ~evaponnor tempcr.nurec. roconrrol tloc pressure dropd. To Cllntml tltc cwponnor pressure

1111 tn is rhe I"Jtio nf lhc rntc ofpro duoiiM ofneutrons to 1hc rot-e ofloss nf nrmron s. 1hcnli!CIOris Cltlled a crftlcul rcacwr. whent t k=Oh. O< k < Ic. k & I~ . k > I

117. ~ ~ v, II represrnl t h ~pcriphl'nll . a b s o l u l ~;ond relariw w loe11ies. r e s p e c t i v e!~ . nndsul11'< I and 2 re ti :no inlet und outlet, 1henwhich o n ~ or lite lh llo111ng velocitytrinnglt;, could he u ro:tiCiiOn t u r b m ~sr;tgtwith reacuon mor"Ihan 5()%?(1,

b.

II

14 lt l I ~c.

~ >"1.L~

w

d.

{X ",,118 The B e r n o u l l i ' ~equuuon rders ru

COIISCrvDiiOII u(a. m a ~ ~h. llneur o m ~ n h l mc, ungu lnr m m ~ n l t u ud.

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Mechanical Engineering Objective Questions Part 10