Mechanical Engineering Objective Questions Part 2

8/9/2019 Mechanical Engineering Objective Questions Part 2

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I ot I

I

_ MECH NIC L N I N R ~ . . . . .

1

3

4

5

Whicb

of the

following are dte inversions

o double slider cranl mechani m?

I

Ol

dham

coupling.

2. Whitworth quick

re

turn moabanism.

3. Beam c n g l n ~ mechanism,

illiptic trammel

meclutui ru.

Select

tho

crrect answer from

tho

codes

given be low

CQdes

a.

1

and

2

b. 1

nnd

4

c I 2and 3

d

2.Jand4

Whi

ch

one

oF

the

fo

ll

owing is a higher

pair?

a, Belt and pul

ley

b. Tuming pair

c.

Screw

pai

r

d. Sl

idi

ng pair

The mechanism shown in tl1e given figure

represents

_

'

--,-

a. Hans mechanism

b Toggle mechanism

c. Watt' s mechanism

d Beam

Engine.

meohanrsm

A point on a connecting link (excluding

eud points) of a double slider crank

mechRnism traces

a

a. straight

li

ne path

b bypelbolio path

c, parabolic path

d.

e

lli

ptical

paV

In

the

four bar mechanism

shown

In

thO .

given

figure, Jinks 2

anil

4

ha

ve equal

lengths.

Tl

te poi

l l

P ott tJ1e coopier 3

will

generate aiM

7.

8

9.

.

Ellipse

b, parabola

c. appro

xl

marcly straight line

d.

cirole

Deep groove

ball

beiogs are used ror

a.

hea

vy

Utrust load only

b. small angular displacement ofshafis

c. radial load at high speed

d co mbined thrust aod radial loads

at

higb speed

The sensitivity dh/dN of a given Porter

Governor, where is the height

of

the pin

poiot A liom the sleeve

and

N ls rl1e

c.p.m.. is pro.foaional to

h

a.

N

1

b N

I

c, / P

I

d.

N

Balancing of a rigid rotor can be achieved

by

appropriately placing balancing weights

in

a.

a single pl;ute

b. two planes

c,

Lllree pl'anes

d. four

plane

A machine DlOWlted on a si

ngl

e roil spri

ug

has

a period

of free vibration ofT If tile

spoi

og ls CUi into four equal

parts

and

placed in para

ll

el and the machine

h

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mounted

n them. then the period

of

free

lllbration of

the new system

will boccmc

a. 6 f

b. 4

r

c. 114

d. 1'/ 16

I

} WbJcli

UIIC or

the

following pal is

ma thed'l

a, Coulomb .

Enefl y

Principle

b . y l e i ~ Oynamic &wilib rium

c. D'A iemben, Damping Force

d. Fourier, , .. .. , Frequency domain

anai)sis

I I Whining speed

of

a s

hafl

coincides with

l11e

llltlllral

frequency -of hs

a.

longitudinal Y1bratfon

b. Lransverse vibration

c. lorsfonal vi

bra

t

ion

d. cou(lled

bendin

g

torsion

al

vibration

12.

There

ate

six

gears

A.

D.

C

D.

E. and

J7 iJt

a

compmmd

Lrain. Tlte numbers nf

teeth

i

1

the geaf i

are;

20

, 60 3(),

80

,

'25

and

75

respectively

The ratio of

the angll lar

s

peec;ls of

1}1e 1hiven

(fol

to tho. driver (A)

of h

e drhe is

a. 124

b 1/8

c,

ijfl5

I

12

13

. A fixed gear

bavlng

I

00 lee

ll

l meshes wlUt

another gear having

25

teeth,

the

centre

lines

or

both

the gears being joined by

' '

ann

- >l

UQ.N

a. "

b. B

c. c

d. D

I

G

A

roller

Of weight

W is

ro

ll eel over the

w()(ldcu block shown io lite given l1gwe

The

pull

F

requ

i

red to

just

cause the

sa

ki

m o t o : : ; n o : : i s ~ ~

a. W/2

b.

w

G.

b

IV

d .

2W

17. Ill the given Jigure, two of

ma ;Ses

mt and m; are ~ o n n c c t e d ny a light

ine>ctensible

striog passing

over

a

smoodt

pulle)'

Mass m

lies on a smooth

Mrizoutal

piSJJe

h ~ u mass m1

moves

downwards

,

the

~ c t : e

l l l l t O i l of

lhe

two

bodies is

equa

l

lo

a.

b.

m

g mI s

r

m i ~ \ , J

m - nr

'

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18

19

20

'21

d '

8

tn / ,;

- m:

A

ball is projected vertica ll

y

upward

with

a certain

velocity

.

II takes 40 seconds fo

r

its

u p w r ~

jo

u

rney 11u< thne Ulken rpr hs

downw&r

d joum

ey

Is

a.. 10 5

b 20s

c

3 s

d 4 5

Malo

h

Lis t

I w1th LiSt

U

and

select the

co

rr

ect

am;wer

usio11

tbe codes given

be

low Hsts.

Us

t L

A 'rwu

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26

27.

28

29

b, Brass

c Steel

d Gl

ass

In a homogenous, ismropic elastic

marl'rial the modulus

ol'

el

asticity

e In

teyms

ofG and K is equal to

G K

a.

9 Kr.

J ,4

K

b.

e

JKG

9

K(;

r. f Ye

ttnd

e ~ e n s t v e p r o p e r t i e s ?

Intensive El'tcnsivc

59 .

60.

61

61.

'? ot

H

a. 1

.2.3

. 4

5.6.

7.8

b. I, 1. 5 7 2. 4, 6, 8

c. 1,

2..

4, 1 3, s.G s

d. 2,

3T

6, 8

I,

4,

5,

I

A new temperature scale

ua

degrees 'N is to

be dellnNl The boiling and freezing pOtnt$

on this scale nre 400" '1 and

I

00"1\

respectwely

What

w11l

be the

readmg on new

scale

corresponding

to 60"C

?

a.

120"N

b I SO" N

c. no

N

d 2so N

If M heat eugane gtves

uu

OUlJ

lUl

of 3 kW

when Ihe '"Pill

IS I

0,000 J/s , t

hen

the

lhe

nnal efficiency

of

the engine

will

be

a

20%

b

30%

c.

70%

d

76

7%

A hem engme 1s supphed with 250 kJ /s of

beat at a co1

1Siam fiXed

temperature of

227"(' rhe

heal

is r e j t ~ t ~ d Ul 27"C The

cycle 1s reversible. tf

d1e

umaunl of heal

'ejected

is

a 273 1d fs

b 200 s

c. I

SO

kJ/s

d. 150

kJ/s

Win

ch

one

of

the

lollmvlll,

I'V

-T

diagrams

conecl.l> repesents iJ1at of an

:

' . .

1

T

bl

P\1

T

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65

66.

d) PI

T

1n the temperatwercuU'Opy

diagrnru

of a

vapour shown in

rh

e given figure. the

them10dynnmic

process s

howo

by

the

dotted line

A8 reJ.lresents

_

T

I ~

r;

B

I

S EnbopoA

a. hy

perbol

ic expansion

b free expansion

c constant volume x p a n . ~ i o n

d

polytrophic

x p n s

The

loss

of

availab le energy associated

with

the transfer

of I

uOO kJ

of

beat t'rt'Jm a

\ Utl$lunb tempcrallJrC

syS\er1l

at 6QI) K tu

another ttl 400 K when tlte envir


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71

72.

73

74

75

b,

J 4

I 2

c 4 3 I 2

d 4 3 2 I

A nuclear reactor is ~ i d to be "critical"

1vheu IJJe neuJrou pQpulation in the react(lr

core is

a,

ra

pidly

o t e a ~ i n g

leading

to th

e point

of'

ex1Jlosion

b decreasiog from

th.

especified va lue

c. constant

d.

reduced to zero

Consider the 1ollowtng sta tements

regardiug he features

of

a Breeder react

or

l It

produces mo

re

fu

el

tha

n

it consumes

2.

tconverts f

en

ile fuel into fisslle fuel .

J t requires liquld sodium

me

lal as

moderator,

4 t reqwres highly curlthecl fuel or

the-

se

~ t e m e o i s

a. .,

2

and

3

are correct

b I, 2 a11d

arc corret.-t

c.

I 3 and 4

are correct

d

: .

3

and

4 are correc1

Wh

ich one

of the

foiiQiving indicat

es the

correctorder ltJ tbe p11th

of

tlue

a. Super-heater, economi.?.er, air prc

he.atcr. precipi tator

b. Super-hea ter,

CC(>

Oomizer, precipitatot

,

air

pre-heater

c.. Supcr-hi.'a ter, preclp i ator. e

co

nom

ize

r,

air pre-heater

d. Super-heater, air pre-heater.

cconomlwr, pr Pr increoses

__./"'

, ->

Pr

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so.

S

82.

tn.1rch List I with

LisL 11

and choose the

CO

II ect

an

swer

usi ng

rbc

codes given

be

tov. the

lists.

~

1

Ust I

A, Curve P

B. CurveQ

C

Cur\ e

R

Ustll

L Discharge

vers

us bead

2. Head versus discharge

J . Power versus discharge

4 Efficiency versus discharge

Codes.

A B C

a, 2 4

J

b 3 2

l

4 3

d

-1

3 I

If tl1e mllXJmum

temperatut

c is Tl and

mmin u

ICmperar

urc is h

Lben du

optimum

pressure

ra1i

o in a gas turb i

ne

is

QJ

VCO by

.

.

=

i

r

b

t =( r,

) h

r 7j

r

[1

J

.1,

.,,

d.

r

-

,.

;

Cooling tower in a st

eam

power i o n is

a device

for

a.

eondensing

th

e steam in

to

water

b. cooling

the

e {laust gases coming out

of h

e boiler

e

Ied

u

cing

WC temperature

of

suporhea\lld s1ca

u1

d ~ d u o i c h ~ empera

cur

e of cooling

water used co oodeuscr

A reversible engine

has

ideal thermal

efl-iaiency

of 30'/a

.

When

it is used

as

a

refriger

at

ing machi

ne 1vilh

a

ll

other

83

S4

SS

JIJ

ur 14

conditions unchanged . the coefficlem

of

performance wi

ll

he

a.

b. 3.00

c

J3

d. 1.33

Wbicb of l'ollowlug are the reasons for

the

vo

l

umel' ic

efficien

cy

of

reciprocating

compressor being less

than IQOo/o

l

I .

Deviations fromisentropic process.

2 Pressure drop across the

J Superheating in compressor

4.

Cl.earauce volu me

S. Deviations

from i

sothennal process.

() Leakages ,

Select the correct ans,ver f

rom the

codes

gi

ve

n

below

Codes.

a.

I.2

3 aud 5

b. 2.

3 4

and 5

c. 1.4 ,

51Ul

d 6

d. 2

J

4 and 6

The

pres

ence

orair iu

acond

enset

a.

increase 1

he

pressttre

f

n

the condenser

and decreases the condensing

coe

ffi

cient

b. decreases the

pt-essure

in the condenser

but increases tbe condensi ng

coefficient

c.

increases

the

pressu

re io

the

condense

8>

we

ll as tlte

cnudcosing

< ~ e i T i c l e

d

decreases

th

e pressure in the condenser

a,s we

ll as

lhe co

nd

ensi

ng

coefticienr

Match l.ist

l

with

List

n and select the

correct answer using the codes given

below Ue l l ~ t s

List

I (Material}

A Glass

wool

B r n n w t t i ~

C G. I. sheet

D Polyurethanc

List 11 (l urposc/ajlplicallon)

I.

Col

d Storage

2

Domest

ic R c f r i g c ~ a t o r s

J . Insulation

1.

Ducting

Codes.

A B C 0

a.

J 4 .2

b 2 3 4

c 3 4 2

d. J I 2 4

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86

It ).

Two

~ t r c ~ m

of

moil

afr '1 ' ~ n d 2 mt..:

together to

give:

nnoth e in the butlding

tc1thc

..:nS

iblc

hc11t

gnin

d. Mnximum ll

l

gain to

3

building

pc.,urs \hrougll wall

>O

.

for

air-conditioning

th

o operatio n thea

tre

in a

hospi tal, the percenta

ge

of

outsiJ.e air

in ~

:Ur

lwbmerged m a

liquul:

I

The tu\41 for 'L< lllc pnodu"t (If

i


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94

95

96

97

98

Tlte preswre gauge reading

ba

ml'tet of

water colu

mn

shown in ~ t t given

figu

re

will be

I l""

-

:

1.

w...

r

The bUt>}'ant force noting


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u Doth A

~ n d

R

nre

IJ\ltr

~ n d

R u

Ute

Cllrrect

eX1llanati

I J , l l ' l ' c O I ; . j ~ l n l l r,rA

.:. A is tr ue

bul

R I,;

fabc

d. A is fills

hut

R lntB

1().1

,

A ~ e r t i O n

(.-\); A

t1ywhcel

i allched 141 d

punehing

p r o ~ s

so

tu

redtoc

.e

its

speed

flu

ctuation.

R e : ~ s o n (R)i

The Oywhcc:l alores energy

when

'

pe.ed

in.:.-eases

.o. Ro th A >nd R nrc: tme anti R is

Lh.:

conett

XI>

lana lion IJfA

b .

Doth

A :ouJ R on: ttue but R t>t o

correct i < J ) I ~ n n t i of A

1 .

A

istnte

R

~ (aloe

d. A

is

fob.:

but

R is

true

1(15.

As .crtion

(A): 'The

outomntic

ll'llic

con\iol

i. nn Opq>anJion ofcombustion

products can ~ 1 l - . : place up lo atmospheric

pr essure..

a.

Both

A

ond

R

:u'l: tlll

0 and R IS UJe

l'Om:ct

""J'

Iau

ntlon

o-f

A

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b. Both A

.'tnd

R are true but R

is

QOI

ctJrrecl e>lplnnotlon of A

c.

A

is true but

R

i$ t a l ~ . :

0. A

is false but

R i&

It

u

113.

Allstrtiou

(A): In

Mn

llioo c:

hort

or

tciiJll..

the constant pressure Unes are Rlr:t.ighl

lines 1n wet region

Reason

rR)

; 1'he

slope

of

to

ustant

pt'CS

s

ur

Documents

Mechanical Engineering Objective Questions Part 2