Date post: | 01-Jun-2018 |
Category: |
Documents |
Upload: | muthulakshmi-jehan |
View: | 231 times |
Download: | 0 times |
of 7
8/9/2019 Electrical Engineering Objective Questions Part 1
1/14
w w
w . e x a
m r a c e
. c o m
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
www.examrace.co
8/9/2019 Electrical Engineering Objective Questions Part 1
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
8/9/2019 Electrical Engineering Objective Questions Part 1
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
8/9/2019 Electrical Engineering Objective Questions Part 1
4/14
w w
w . e x a
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
8/9/2019 Electrical Engineering Objective Questions Part 1
5/14
8/9/2019 Electrical Engineering Objective Questions Part 1
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
8/9/2019 Electrical Engineering Objective Questions Part 1
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
8/9/2019 Electrical Engineering Objective Questions Part 1
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
8/9/2019 Electrical Engineering Objective Questions Part 1
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
8/9/2019 Electrical Engineering Objective Questions Part 1
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
8/9/2019 Electrical Engineering Objective Questions Part 1
11/14
8/9/2019 Electrical Engineering Objective Questions Part 1
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
www.examrace.co
8/9/2019 Electrical Engineering Objective Questions Part 1
13/14
8/9/2019 Electrical Engineering Objective Questions Part 1
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