Electrical Engineering Objective Questions Part 1

8/9/2019 Electrical Engineering Objective Questions Part 1

1/14

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w . e x a

m r a c e

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1

c

•:

're-1998

I

of

I I

I

ELECTRICAL ENGINEERING

3.

4

The open-loop tran$fer function of the

co

ntroi system shown in t

he

figure is

10

a,

s(s+l)(s+2)

b. 0.()

6

c.

.

v .-+

l)(s+2)

10

d

s

t 3s ' +

2.1

16

c

s

lf th

e single ti

ow

graph sbown in

th

e given

ligure has M nu mber

of

forward

pa lhs and

P nu

mber

of individu

al

loops. then

. . . . , , ~ ) - ..

:

11, M =

6,

P= 6

b. M=6, P=4

c. M = 4,P= 6

d P = 4

The impulse response of a ~ - y s m is given

y c(t) ~

l

Which one of the

2

following

is it's unit step respons

e'>

a. 1 e

17

b_ e •

c. 2- e '

1 e :

lf

the

o

p

eo-l

oo

p

tra

nsfer

fu

nction

of

a

feedb

a

ck

~ - y s

m

is gi

ven by

O(s)H( < K the

~ . ~

.. 2)(.s' f2st-5 )

centroid of t

he

s mores will be

a.

·1

,0

b.

1.0

c 0,-1

d

0.1

5

The

lir.;l

element

or

each of the

oows

of

a

Rout

h-

Hurwitz stability lest

showed

the

.si n as follows:

Rows

f

11 111

V

II

I

Sings + +

6

7

8.

9.

The number of roots of the system lying in

tlte right half of s plane is

a.

b 3

c, 4

d. 5

The performance specifications for unity

feed

co

ntr

ol

system having an open -loop

transfer

function

G

s

K

ar

e

s{s

+

1)(; +2)

J Veloci t¥

e1Tor

coetliciem

, >

I

Osee- '

2. Stab

le

closed-l

oo

p o

pe

rati

on

Ti

te value of K, satisfying U1e above

SJ>ecification is

a. K>6

b. 6

X, ' 2x

1

+ 4x,

X

2X,-X

, - u(t)

Whore X

1

and

X,

arc state variables and

u(t) i9s theinput. The system is

a. Controllableand stable

b. Comrollable but unstable

c. Uncor1trollable and unstable

d. Un

con

trollable but stab le

For

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2/14

w w

w . e x a

m r a c e

. c o m

l i s J

= [ s

~

~ s

.?

6

s

- 5

s

s

+

s

+5

s 6 ~ ~

Tlt

e coeO'ic icnt

motr

ix At;

r

o

5

]

b -: ]

e. [ 06

.]

1

6]

10.

Whicb of lhu 1o llowins yuantitios are

nnalogou• in a

force-current

analogy?

1. Oispl•cemenl. and indu ctance

2.

Ve looily

oud

vollltge

3. N its• nnd capo

ci

taoce

Select th

e correct :mswer

U li

ng

th

e codes

given

below:

n. 1 nd 3

b. 1 ond 2

c

a n d ~

tl. 1 and 3

11. R and

X '

the ""islrulc" and indicntiw

r""pectively D llfld L n.re the diameter a.nd

m p

edively o

l' lh

e rotor f)f a t

wCl-

phosc ac strvomotor. then the ratio Drl.

~ n t l

X1R

i l

l

be

respec

ti

v

el

y

n, Large and lar

ge

b.

Large and

g

maH

c.,

S m ~ l l and

ln.rgc

d. S

mull

and

n o l l

12

fn

the c a ~ e of on •.rrnnmre controlled de

motor,

if he

G-qttival

eo

t mo

mG'Ilt

of inertia

t> the tnOIIIr and load is mode smnU and

the tntiattlre r

o.siN

·

un

ce e t : d ~ tlu..1.1

the

motor l

end

s

to

act like armature

re

s isl lnce

is reduced,

then

tbe molt>r lontls to act ll kc:

A

dill'erenli..ning

circuit

b.

An

integnotingoircun

c.

A

Pro controller

d. A

~ c c o n

order

criu"" II

)' d.1mpcll

$Y•

Lcm

13 . 'Lo doteo t the

OTor

between " reta...ce

;

haA

position

and

an output position

whicll of the following error d.:tect

otll

can

be used?

I. A

pairoftachoge

mn011oro

2 1\ pairof potentiometer

3. A n c l U l m y pair

2or

1.1

Se

lect the

=•

n s w c r

using

the codes

given bel

ow:

a. 1,2

ond3

b. 1 and 2

c

2

•

md

3

d. I and .3

14. WJt

deflecting pltttcs of n enthodo ray tube, the

hrlght

Ccolt

.:. ff

30V (nns) ac i• npplic:d. th.m the

movementof ho

•

J><

I

will b' ' ''IY

a 1 m

h 1,5

cm

cj m

d. cm

15. A

s

pcdnim annl;,

•zcr con be described

o.•

a. Yolta.ge selective frequency meier

b. Coll'ect selective frell

[ I+ ~ (

3141

;o

•) 2 ~ (

1S701

20")l

umptli'C S il; mellSurc witlt •

lhcrmocoupltt

lY

PI'

Jmmetot'. The;

meter "

ill ~ n d

a. 2A

b.

&

c.

(.H

.Ji A

d. 41\

18

. ;\

h e n n u e o u p J ~ 11rodu"-es a vo

lt

nge

cof

50mV.

JI.;J

intet·n4J resis tance i• IOQ . llll;

output

is read by a l

>l\IJV

IC

me

ter

b:Mn l

an

internnl

r

.,.L


3/14

w w

w . e x a

m r a c e

. c o m

19

20

21

22

33 3

mV

d 2S.

OmV

The throe I m p e d a c e ~

of an

nc bode

shown below re

z

=

200160-n

1. =4001-90•0

Z

=300 o•n

The

val

ue

01'

Z.

tor

the

bal

anced

bndgc

is

T

l

a

t S ~ 1 n

b.

n

c.

600I

-3

o•n

d. 6001-IS O•n

Mm ch List 1 (Typc or instrument) with

I ist l1 Swtnb1h1y for

ml nsurement) ro

nd

select

th

e correct nnswer osing

t

he codes

wven below the

list.<

l

•

tl

A. Moving

•run

B

Elec

trodyn

nnucs

C Induction

D. ElecrroslntJc

Li

st

I acldc •·ollage

on

ly

2 acldc v o h t t g u r r e n ~ p O w e n m l y

3 ac vuhage/curre.nttpower

4. acldc

vohagelcur

re

nl/power

5

de

v

ohageiCIIrrec

.t

A B

C

I)

a

2 4 3 t

b 1 4 I 3

c

1 3 5

d I 2 5 3

In a Wheatstone bride3. known

reststance:>

are

correal to wnhm

±

the oocurncy 10 ll hlch an unknown

reststance can be measured os

a O

• ~ >

b. 0.3%

( 0 . 2 ~

d.

O.l"'o

Match J funtt) with.L1st

1J

Eqwv11tent

oiOit

1

and s e l c c ~

the correct

ans1ver

ustng

the codes glvcn below

lhc

lbts:

Li

s t I

A_ Weber

24

::s

26.

B Coulomb

C Farad

II

I.

m p e

r ~ - s e c o n d

per

voh

2. V o t . ~ e o o n d

J .

Ampere-second

4. Vo li l


4/14

w w

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m r a c e

. c o m

27,

28.

29.

~ 0 .

31

.

... 800

b. -800

c.

11) )0

tl. -1000

f\f•tch I \'Device)

wi

th l.i.:ll givott belo"

ll1e

lisls:

Li>t r

A. 'Planar monoliihl k BJ'I'

B. '

Th

ick lilni

C. 'n liin film

D, Opt co

up a

u

I . U>w-cost resistot

S

2. Rosi:U

l

rs

$U[

Iablc for high ~ u . , . ,

use

3 hmla·•or

4. liigb li·etp t

em:y

tr.Utsistors

A

a C

D

n,

2 3 1 I

h 4 I 2 3

c.

4 1 3 2

d. 2 3 ll

t.s ~ Ei

tL (E,

S

1

e, )"'

Fo1• Utrec Jinks in tandot'tt , each of he fom

low has SIN rotio

of60

dB whi le the 1hird

h • ~ the same 40d8.TIIe overall

SIN

r;otv

( ~ p p r o x . ) is

(1. 30dD

b. 40dB

SO

dB

o

.

60dD

32

33.

34.

35.

36.

,f ' 14

1\ IOMHz c

nrr

ier of e ; ~ k va lue lOV

Is

"

amplitude modulared by a

J ( ) ~ H z

single of

ampl ilude 6V. The amplitlldt ol' ea

ch

si

de

band .frequency;,

a

~

h. 4V

1 .

5V

d. 6V

C o n . ~ i d e r the followin g statements:

U.:lta

Modllll

ot

ion

h

ilS >ome sisnificanl

advantages

uvcl

PC

[

.IS

I.

t

provide$

groal.

er

cbo.owel capocity

far

• given bit·rnle

2 It does nol inber.,IU)' o

eq

uire

s y n c

' t l o n

3 ft

is more

tolerant to

syslam

noi ses

()

f

tltese s

tot

ement•

a. 1,2 and 3 ore

co

rrecl

b. 1 md 2 '

co

rrect

c,

2 and 3 ore

co

rr

ool

d. I nod 3 are llorrect

Consider the follo ingst2lertoents:

Equipment

i• avatlnblc lo l t > CJJIT)'in

g

more l

han

one voice

clln

nn

el

on

l. A pair

9f

wores

2. A

COMta

l ca

bl

e

-'· A t•adio link

4. All oplio fiber

Of these

~ < ~ l e m

a.

l,2

und 3

are c()rreet

b 2 3 and 4 arc ~ u m : :

c. I ond 4 t

or

e

co

rrect

d.

l.23

and 4

•re

co,.,CI

.:onsider the following

otttter

ncul$

ro

sarding o i ~ e m

pul

•e oommuni

o4ti

on

sy$lcm•:

I.

Those > r m s

11f pul

se mo

duiM

ion

w

hi

ch

l,.lllSLn

il

Clll t J IIIItl aUl

J iJiude

i n g l e

c•n he

mad

e to

hn

ve good

g n

o ~ ~ e

r•tio,

2 Fo

o

PWM and

PPM.

u n p r o v ~ l

singl

.c

l

o-ot

oise requires

higher

brut

dwid

Ut

.

3. In PCM. IIU;tnlizlng noise s o ~ up if

tho numb

er

of

st:mdlltd

J.,yels

;,.

increased.

Oflb 'o &U111lm


5/14


6/14

w w

w . e x a

m r a c e

. c o m

< :

I

ht

direction of

muon

and

cc.mncc

lion

l f

rlle

field winding

Me

rever;;cd

D,

TI\C: direciJun 01' mtatlon and

re:

iilou.

r g n : l i

S t n

rr

ru

rcvcrsc


7/14

w w

w . e x a

m r a c e

. c o m

53.

S4.

56.

,L The nctive power u p p l

will

decrease and the· wi

ll

u p p l

l < : : ~ d oeaetlve pllll't,.;d,

it

will

= u

I

in

n. R

ever..

IofT., E IAIU;ins v,

b.

R ~ e r s

ol 1. but

1'.

1

leadinl v,

e.

'llte sign Ql' lp r c m a i n 1 n ~

un

c

han

g

ed

.

but E

1

leading V

1

tl

The

s ign

of 1,

re.nu

in

ing

l.mt;hnnged,

but E,

l•B

Jil

S

V,

A3·t>h•se irtductloo molor has • full· oad

slip of 3 percent at nonnal vohage.

Whi

ch

one

of d1

e

fo

ll

ow ing will

be the v.-

tue or

the ;;

Jip ol'

th

e

m OIC>r of

il de3vel0ps

Ut

e

m

torque ll

\c r

c

ically

while

p c r n t i n

~

nt 11

0 pc.r

cent

of its nnrmal

vo

ltage?

n.

2.48%

b.

ll OA83%

d.

A-6-pole.

~

' J l h : l l l

WHr induction motor

runs at 1000 ''Pm developing on:oximuon

torque. Wtoo 1

10sis

tance per phase

is

1..2

ohpu. Neglooting s

btor

imped;mce. then

for d '•e loplng maximum torque. th ;o

.::<

t

mru resis

bn

oe to be co

nn.:«

tartin

g

l


8/14

w w

w . e x a

m r a c e

. c o m

3

66.

l'rov1des IQ\\•reactance p; U

S

l

br zero-

sequences

corrects

Of

these

statements

·

a.

I

2 and 3 arecorrect

o. I 3 and 4

ore

\lOrre¢t

c,

2 ancl 4

are correct

d 1.2.3 and 4 are correct

II

dv

lat'ling Valueof

c. l{cmaln the

Slime al l

d. e a s ~

to

some

highest

v n l u ~ of

cllrrcol w1d

then

d

ec

tcasc

ugrun

lo 1

Cor1S

1dt t

the

fo

lio" ng

U t t e m ~

'll\c wuroe mducUlncc of un 11


9/14

w w

w . e x a

m r a c e

. c o m

,,,

S q u ; ~ r e

wave

invert..-r-ted

induction

motor

h. P\\'M inl'erler-ted induction rnOIOf

c.

Slip

energy

e t : O v ~ r y

l llcrnc

\\

itlt

cy choc Qvertt;r

in

l h ~ rotot oircoil

d. ( ' y ~ f q c o n V < O r l e r f e inducli,On mo t

of n c b r o n o u . .

spdCd

to

~ y n c h r o o u . ~

xpeed

2.

10% of

p < : e d

to btl'Ond base

~ I c e d ( I

1

0)

S. 0 lo

113

bose >

p®d

4·. 67'"•

of sy

nchron

on>

speed II I

n•u qf

s y n c h r o n o u ~ S1

1ee

d

7..:rll w

1 l l ~ • of

b•

u ( infinity)

Cod then

a

line i< called

l l .

,

in

the positive

direction ofx

b.

Both

wov"" IJ·•vl in the negativt

d i r c ~ l i of)(

78.

F'l>r

reducing tower

fool in

resi•t•uce.

it

is

I


10/14

w w

w . e x a

m r a c e

. c o m

82.

83

84

85

86

S7

c.

21 •

.2

1

d. 8 8

A

chyrite

llghtlng

arrester has

a, Inverse

resistance characterislics

b. A BP.

c Eflicienl

earthliug

d 1

combination

of inverse

resis

t

ance

cbaracterisiics and gap

D1 fferenti11J

proceccion

of a

gent>rncor

mak

eS use of the princi

pal

thac under

normal conditions, the currentlcurrencs

a. AI

t

be neutral en

d

of a pbase winding

szero

b. In

each

of

c

he

pl\ase

winding is

identical

c. AI

b01h ends of

che

phase winding

arc

eq1

c

al

d At

che

two

ends

of the phase

winding

are uclequal

the

re


11/14


12/14

w w

w . e x a

m r a c e

. c o m

00.

102.

103.

Rm son

R);

T r a m f o n n e ~ be

longing

to

different

vecror

gro ups will no

t

have rhe

same

phase sequence on the ~ t c o n d a l ) l

sidt.

(1. Both 1\ and R nrc true aM R Is

the

COtTl:ct U.

fs

a

b. 2

c.

3

d 4

R

•

t O

Tile driving-poi

nt

impedance of

1he

t]elwork shown ttl the figure IS gtven by

IL

b

•·

312)

(.v+$ 14)

• 0 / 2)

(-•+5/4)

c. . < + 5

x+3 / 2)

d

1

s

+ 312)

-1 (

.•+1 1

The

correcr vu

lue of he cu

rr

ent 1( 1

al11ny

mstan

t when K ts switched on at t

=

0 In

1 1 ~

ne

two

rk

in the given ligul\> is

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13/14


14/14

w w

w . e x a

m r a c e

. c o m

8. 0

b 101

c. I

d. 0,

5 Two

coup

led coils

ha

ve L

1

= O,o .

l-f0 ,6H

a

nd

coupling coe licient =

0.25 ,

coil 2 has 800

rums

.

l

urre

nt

1, In co

il is

6sin I

OO

L

amps,

then the voltage across

cqil2 is

a. 9()ws

l O O t v o l ~

b. 9cus J

OOt

voi S

c, 0,9cos l

OOt

vohs

d 0,09cos

1001

vol

ts

11 6. fa charge

of

one coulomb Is 0 be brought

to a

disLance

of

one t ~ t e r from a charge of

l

coulomb , t

hen

the

worl<

required

is

t

a. N - m

2.'tl:

.

l

b. - m

Jll;

l

c.

2m:

0

N - 111

d.

4tre

, N -

111

117 A

small

permanent magnet

makes small

osclrlatlons in a unllorm magnetic field as

s

hown

in he glven llgw·e. The period of

oscillations T iF Ihe strength

of

the

magnetic field is doubled , rhe period of

oscillations will be

B

a, 2T

b. r..fi

c. l l..fi

d

'f/2

- I8 A

uniform

plane eleciromagnetic wave

with

electric

component

E

=

E,, cos

(ml - p.

t)

propaga tes

in vacuum

along the

posi

tive

x-d

ircctlon The mean palming

vectOr

given

by

8 . Ps,c E I

OJ

b I

11

· E I

. 2 4 \ c; . l

11uf 11

I

c ~ w

d.

~ PPs

,,c?E

I

01

I19 Match List I (An remrna) viib List U

A c ~ t i o n / C h a J a c e r i s c s ) and select the

correct answer using the codes given

below the lists:

Lis t I

A. A quarter wave monopole

over

ground

plane

B. A

vertical

half-

wave

dipole

C Folded di pole

D.

1-fertzian dipole

(lengtlt<

).

100)

L

i.•t

II

1

radiario

n resis

tan

ce

Electrical Engineering Objective Questions Part 1

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Transcript of Electrical Engineering Objective Questions Part 1