electrical engineering objective questions part 11
TRANSCRIPT
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•
c /V09
DO NOT OPEN THIS TEST DOOKLET UNTIL YOU
ARE
ASKED
TODOSO
-
T.B
.C. : P DTQ J FFO
Test Uooklet Series
i l
No.
.
463
TEST BOOKLET
ELECTRICAL ENGINEERING
Sec
Tim
e Alluwed : Two
Hour.
M=imum Marks 30<
INSTRUCTIONS
L
IMMEDIATELY AFTER THE COk MENCEMENT OF THE EXAMINATION,
YOU
SHOULD
CHECK THAT THIS TES'I BOOKLET
DOES NOT
HAVE
ANY
UNPRINTED OR TORN OR
MISSING
PAGES OR
ITEMS. ETC. IF SO. GET
rr·REPLACED BY
A COMPLETE TEST
BOOKLET.
2.
ENCODE CLEARLY THE TEST BOOKLET SERIES A, B, CORD AS THE CASE MAY
BE IN
THE
APPROPRIATE
PLACE
IN
THE
ANSWER SHEET.
3.
Y(lU have
to
enter your Roll Number on the Test
_Booklet in the Box prov1ded alongside. O
NOT
write anything else on the Test Booklet.
4.
This Test B(l(lklet contains 120 uems (questious). Each item is pronted both in Hindi and English.
Each ilf:m comprises four responses (answers)- You will select the response which you wan
to
mark
on the Answer Sheet. In case you feel ~ h a ~ ~ h e r e is more t b ~ n one correct respome. mark the response
Which you consider the best. In any case, choose ONLY ONE response for eoch item.
You have to mark all ~ o w · responses
ONLY
on the separotc Answer Sheet pres on the Answer Sheet and the examination has
concluded. you should hand over to the lnvigilator
only the Answer Sheet
You arc perrrtined ro take
away with you the Test Booklet.
Sheets for rough work are appended
in
the Test Booklet at the end.
Penalty for wrong
Answers:
TilERE WILL BE I'ENALTY FOR WRONG ANSWERS MARKED
BY
A CANDIDATE IN THE
OBJECTIVE TYPE QUESTION PAPERS.
(i)
There are four alternatives for the answer
to
every question. For each question for which a
wrong answer has
been
given
by
the candidate,
one-third
(0·33)
of
the
marks assigned to that
que•tion will be deducted as penahy.
{ii)
If a cl i t ~
' "'5
R W T ~ I
.
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1.
A 2 .iF capacitor
S
charged by con
necting it across a
100
volt DC supply.
The supply
S
then diSCOnnected and
another
J j.lF
uncharged capacitor 1s
connected across this capacitor. If there
S
nO
leakage; which
of
the following
gtves the eorrect voltage across the
plates
of
each
of
the capacitors ?
2.
•
(a)
100
volts
3
b)
100
volts
2
200
volts
3
(d
100 volts
·
•
+
'
-
In the case
of
ahove circuit.· which
one
of
the following statements is -correct ?
(a) It can be analysed by minimurp. one
loop equation
(b)
It
can
be
analysed by
minimum
two
. loop
equations
c) It can be analysed by minimum
three loop equations
(d) It
cannot
be analysed by loop
method
P TQ J FFO A
2
3. A circuit consists
of
several resistors,
on6 independent voltage sourue· and one
i11dependcnt current source only. f the
powers consumed in one
of
lh
0,
then what
are the values of the voltage (in volts)
and charge (in coolomb) on the capacitor
at t=3.
a)
2.
4
b)
4
2
c)
-8,
4
d)
4, g·
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1. r;
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5.
+
Vs-
H
-:c
Yt:
w
'
'
The network shown in the above figure
is in steady state wirh the switch closed.
At
t '
0 the switch is opened. Which
of
the following gives the voltage across
the switch,
V
and ~ at
t
= o respec
tively
?
(a)
0
and 4
V/s
b) 0 and I V/s
(c) 2 V and 2 V/s
(d) 0 and 2 V/s
6. R, Land Care
connected in series in the
order RLC. f the voltage across R and L
together is 20 V, voltage across L and
together is 9 V and total voltage is
15
V,
then what is the voltage across C?
(a) 7 V
(b)
12 v
(c} 16 V
(d)
21 v
7. In a symmetrical three-phase
~ y s t e m
phase sequence RYB a capacitive
rei:tct
ance 10 ohm is across YB and a coil
R +
jX
across RY. When
ly '
0, which
of
the following gives the values of
Rand X in ohms respectively?
(•)
lO, 0
b)
J0../3, 10
(o)
5J3 5
(d)
s,
s-J3
P DTQ J FFO
- A
4
8:
'o----------
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s.
+ v .-
fH
+.L
-If;;
f
2V·
m{m q & < i ~ 1 'lQT "ll
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10.
What
type
of
system the difference -
equation y n)
=x n) +
x n-
2 - 2
reprc
sems?
(a) Linear time-invariant system
(b) Linear time-varymg system
(c) Non-linear time-invariant s y . ~ t e m
(d) Non-linear time,varying system
11 What is the average value of the
wavefonn x t) =
4
cos
41--'5 sin 5r?
(a) 0
(b)
2
(c)
2
20
(d)
n
12. Which one
of
the following statements
is correct ?
A
discrete
LTJ
system is non-causal
if its impulse response is
(a) anu n- 2)
(b) u n )
c)
n
2
u(n)
(d) a ~ u n + 2 )
13. u(t) denotes tlle unit step function, i.e.,
u(r)=lforr; , .o
u t )=Ofor t
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10. ORR tl •fi'li
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•
17.
:x: (n)
:
0
•
_
What is the fundamental frequency
of
the discrete-time square wave, as shown -
in the above figure '
(a)
(b)
(c)
n radian
d
2
ra •an
d
ra 1an
4
(d) 0 radian
18 When a continuous"time signal x(l) is
sampled, what• will he
the sampled
signal
?
•
a) I t
is a product of
x(r)
and an
impulse train
(b)
c)
l
t is a
product of
.x r)
and a unit
signal
It is a product
of x l)
and a
ramp
signal
(d) It
is
a product
of
x(t) and a unit
pulse train
19. For a tachometer. e t) is the rotor dis
placement. e t) is the
o u t p ~ t
voltage and
K, is the tachometer cunstant. Which of
the folluwing represents its transfer
function '
K
1
·s
2
(b)
K,
'
(C)
K
'
'
(d)
K,
P.DTQ·.I FFO
- A
8
20.
-H,
-H,
0
"
0
c
c
With refcrcn : , , = n ~ ) l [ f l
h i ~ h one
of
the following statements
is correct for t]le system represented
by the block diagram shown in the
above figure?
(a) Open luop is stable but dosed loop
unstable
(b)
Open
loop and cluscd loop both are
unstable
(c) Open loop and dosed loop buU1 are
stable
(d) Open loop is unstable but
closed
JOup
stable
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17.
X (11)
'
'
1111 Ill
II
TillP. n-Ilml
;-.t-J--m-111
TJ-LI
~ m
B'
Til-14f4ffi li:f
(b) K,
'
(d) K,
20.
21.
'
-H,
•
l f 2
0
>
0
'
G c
3m:
fu:m ir
lJ'it ~ ~
~ i t ;
t'I'"'NI
.if f.1'•1 Poi Rid if WiT
t'
(d) W T 'n' T
3WWit t ~
;;R mT
-·
A - P DTQ J FFO
•
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22.
23.
R(s)
'
Gj) ·
I K I
c 50
(o)
O.OK
10
R s)
C s)
•
s(s+4)
Consider the following statements, with
respect
to
the unity feedback system
shown in the above figure :
I. The characteristic equation IS
? 4s 16=0.
2. The loop transfer function ts
16 •
s(s+4)
3. The natural frequency of
oscill
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22.
23.
R s)
· ~
.
:..l) -I
C(s)
I
'
3>'1 f W t < > W f t ~ ~
0·25
t
I
OJq>fm
~ i f i f ~ i t ~ ~
t
(o)
~
1, 2
am:
3
(b) - ~ 1 . 2 , 3 a i t t 5
( )
~ 1 . 2 3 aih:4
d) I, 2, 3, 4 3ft
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•
26. Which one of the following is correct ?
Within a conductor
canying
a Cllrrent ' '
with
a
constant current density across its
cross-section. the magnetic field strength
'H' at any distance
r
from the centre
of
the conductor (radius of the conductor
is 'R') is given by
[,
H
(2nR)
(b)
lr
- (''"')
c)
H _ lr
-
(2•R )
[ ,
d)
H-p;R )
- 2nR
4
)
27. Which one
of
the following is correct
Giyen the field
E=(- ~ ~ a , in s ~ r i -
cal coordinates, the potential of point
A 2, n, ~
with respect to
point
B 4, 0, ")is
· a) 4 V
b) - 4 v
c ) - 3V
(d) 3 v
2&. Match List I with List II and select the
correct answer using the code given
below the Lists:
List I
List II
(Quantity)
(Expiession)
A. Power flow density
L
E>H
E
B. Impedance of media
2.
H
C. Joule heating
3 E·H
D. Velocity of light
4.
E
i i
P DTQ J FFO
-
A
12
Code;
A
B
c
D
(o)
I
2
3
4
(b)
4
2
3
I
(o)
I
3
2 4
• d)
4
3
2
I
·
f
..... __
__
H
= ax Hx
-
oy H, represents
ilio
H-field in a transverse plane
of
an em
wave travelling in
the
Z-direction, then
what is the E -field in the
wave?
Zol1xHy- dy Hx
J
b)
Zol1xHy
+
' JyHx
J
(o)
Zol-1xHy-' JYHx
J
(d)
Zol-
-;_ '
Hy
+
dy Hx
J
30.
For a material with conductivity
G
=
w-
2
s/m
and e =
3E
0
,
at
what frequencies the
conduction cur:ent density will
e
equal
to displacement current density ?
I
- MH
60
b)
60MHz
(o)
6·0MHz
d)
I
M H ~
6
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26.
(NIH;fl
K t) i t
:erT'Q I
&c:: i l ; < l f R m ~ ~ ~ 1
11
mft
¢ r 'Ij;itn
( ~ )
~
l .
ExH
2.
H
13.
A B C D
a) 34
b) 4 2 3
,,,
3
(d) 4 3
2
2
4
1
c .... ->
.... '-
2?. ~ I « H=axHx-ayHy rr
7
1
(•)
- MH,
60
{b)
60 MHz
c)
6-0 MHz
1
(d) -
MHz
6
A -
P DTQ J FFO
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31. Which one
of
the following stalliments
is correct?
The condition which does not guarantee
distortion less transmission is
.
(b)
at low frequencies. R > > mL and
G>>WC
at high frequencies,
R < < wL
and
G WC
C=
GL
R
(d) R=G=O
32. By which one
of
the following modes
the
rectangUlar cavity resonator cannot
e
excited ?
a) T Eon
(b)
TE OI
c)
™110
(d)
T E
110
33. What is the type
of
wave impedance
of
a waveguide operating in T mode at
frequencies below cut
off
frequencies?
(a) Complex
(b) Pur-ely reactive (capacitive)
(c) Purely reactive (inductive)
(d) Purely resistive
34. If the radiation elecuic field at the
point (r, fJ, ljl) due to a short dipole
antenna located -at the origin is
E.
then
what would e the field' at the point
2r, 8, 4 )
?
P·DTQ J FFO
-
A
l
.
b)
E
8
E
4
E
2
d)
E.
I
3S. Which one
of
the following statements
is
oorrect?
For an intrinsic semiconductor, the
conductivity at any given temperature
(except at absolute :rem) is
(a)
Zero
(b) Depends upon the Fenni level
(c) Mainly due m the electrons
(d) Due to both electrons and holes
36, Which one
of
the following statements
is correct ?
Hall i:ffect occurs when
•
longi rudinal
magnetic
field
applied
00
•
conductor
carrying
current
(b)
•
transverse
magnetic field
applied
00
•
conductor
carrymg
current
(c) a rransverne electric field is applied
to a conductor carrying current
(d) a temperature gradient exists across
a conductor carrying a current
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31. f.1qofdeyl'1 i t ~ a -
"""" w ""'
t
'
(a) f.n:
:aflf>il -;f;'t
"11 ffi
f
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37. Which of the following statements are
correct for a super
conductor?
L A super conductor
S
a perfect
d i a m ~ g n e t
2
A super condu_ctor becomes a
nonnal
metal when an electric field
is applied.
3. A supcr conductor expels magnetic
flux from within its volume.
Select the correct
code given below :
a) I, 2 and 3
b)
and 2 only
c)
2
and 3 only
d) 1 and 3 only
answer using
the
•
38. Consider the following statements :
A dielectric material has both elec
tronic as well
as
ionic polarizations. If
the frequency
of
the alternating electric
field is increased. then
L ionic polarization will increase over
electronic polarization.
2. electronic polarization will increase
over ionic polarization.
3.
ionic
and electronic polarizations
are respectively, due to relative
displacement of:
i)
positively and negatively
charged atoms_
ii) electron cloud w.r.t. the
nucleus.
P TQ J FFO
16
. Select the corrttt answer using the
code given below :
a) only
h) 2 only
c) 2 and 3
d) I and 3
39. Which of the four contributions to the
total polarization has a large dependence
upon temperature ?
a) Ionic
b) Electronic
c) Orientational
d) Surface charge
40. Which one of the following statements
is correct.?
The
energy stored in a dielectric medium
depends upon
a) the scalar product of polarizaLion
and applied electric field
b) the scalar product of polarization
and local or internal) electric field
c) the product
of
the space charge
density of the dielectric medium
and the applied field
d) the vector product of polarization
-and applied electric field
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37.
m- *m H ~ 1 f u k ~ 1 1
it it
m
i t ~ ~ ~ ?
2. ~ " l ' " ~ S c t i
m
" ' " l f r i " ' ~ < ' 1 ' 1 i
UT JRUT
ffi\ Of'f ...-rill t I
3 Rr i l > i ~ l < t l '
it it
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•
41
Which one of the fol owing statements
is correct 1
Upon alloying, electrical resistivity of
iron incrc·ases by a factor of four. In
comparison t pure iron eddy current
losses in the alloy
(a) increase by a factor of two
b) increase by a factor of four
{c decrease by a factor of four
(d) decrease by a factor of two
42
Which one of the following statements
is
correct?
The
o11idant
is t k e n ~ i n from the gas
stream by Cl\isting oxide layer
by
a
proc_ess
of
diffusion
b) bombardment
(o)
absorption
d)
adsorption
·43. The presence of which impurity material
increases the O lide etch rate several
fold?
•
Boron
b)
Phosphorus
Cadmium
d)
Sulphur
44. Which one of the following statements
is
correct?
In "ion implementation" annealing ts
done to bring implanted ions to
(a) Interstitial sites in the lattice
b)
Substitutional sites in the lattice
(c) Top of the substrate
(d) Bottom of the substrate
P DTQ J FFO - A
18
45 Which one of the following statements
is correct ?
A CVD reactor two principal
purposes-
one is
to
provide
a
uniform
supply
of _gaseous
reactants to the
substrate surface; the other is to
(a) provide energy
to
,supply the
activation energy
(b)
absorb energy from the substrate
'5urface
c) remove reactants from the surface
{d) purify
the
surface
4 i, .Which is the most commonly used
passivation
layer?
47.
{a
Metallic layer
(b) Oxide layer
(d)
Nitride layer
Organic layer
Which one of the following statements
is correct?
In the rectifier circuit as shown in the
above figure when
v
1
t)
0,
(a) D
1
conducts' and
D
does not
{b) D
conducts and D
1
does not
{c both D
1
and D
2
conduct
(d) both D
1
and D
2
do
not conduct
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tt f.\k1f. Ma li if
'"'"J11 i
lfll"ii" ~
?
f i l ~ u IWI -..B 'R i t i l : w ~
;m: lJ"'''I if iiPilit
I fiN all j, ~
~
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Cc
fo
j
r
·-+-r
c
~ ~
I
.J
D
+
Which one
of
the following relation
is correct'
The
logic operation perfonned
by
~
BJT circuit is as shown in the above
figure
is
given
by
(a) fo A B C D
b)
fo=A B C D
c)
fo=AB CD
d)
/o
AB CD
49. A Darlington pa•r consists of two
cascaded
emitter
followers wherein
t e
second transistor constitutes the emitter
load for the first. Which one of the
following statements is
not
conect in
respect of the circuit?
(a)
It
has very high input impedance
(b) Gain is
{P
where
j
is the current
gain
of
the individual transistor
P-DTQ-J-FFO
- A
(c) Voltage gain is less than one since
each transistor is connected in the
eminer foUower configuration
(d) Overall leakage current
is
very low
50. For a BIT the biasing circuit should be
designed so that
it
is stable (with very
little change
in
de operating condition)
when the following
change wit
varia
tion in temperature :
Here, with respect to which
of
the above
parameters, biasing
is
Stabilized ?
(a)
I
only
(b) I and 2 only
(c) 2
and
3 only
(d) I, 2 and 3
51.
f
the differential voltage gain and
the
common
mode
voltage
gain
of
a differ
ential amplifier are 48 dB
and
2
dB
respectively, then
what
is the value
of
CMRR?
(a)
3
dB
b) 24 dB
c) % dR
(d)
50
dB
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.
(o)
.. &at ~ ~ i t R: it
< > ~ M < t > R < l a
iJ.rr
fm:rit
f . ; - ~ ~
(
D
%(de 9 1
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+12V
2K
c+
B
~ ) C r .
-?
(a) Gain== 10,
ft.==
1
Hz
fH 1M z
(b) Gain=IO,ft .=100Hz,fH=1MHz
(c)
Gain==
1000, ft.= 100Hz,
fH== 10 MHz
(d) Gain= 10, ft.== 1
Hz,
fH I
kHz
55, Which
one
of the following statements
is correct 7 ·
In a nonnalized Chebyshev low-pass
filter, the de
response
{a) is
always unity
b) is
always
less dum
unity
(c) may
be
unity 'or less than unity
depending upon whether the order
of the filter
is
odd or even, respec
tively
(d)
may be unity or less than unity
depending upon whether the order
of the filter is even or odd, respec
tively
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Sl.
+12V
H
1,.
'"'
c-.
'
\,
"
-
-
"
:;;tl\ ;ri1- m 1; '1fuN i{ m
1iJrwr;
1W
(Ic >1\l:
(I'
al
'liT
l 1'f 'lliT
t ' (
lFl ~
B
oiR .
~ · B E
0·5
V 1 :'1'
" Tf1R
l1l1 tf '300
~
l
mA3i'R9V
(b) 2 rnA. oil< 6
v
(c) 2·5 rnA
oil<
4·5
V
(d) 4 rnA 1ft\ 0 v
53.
' ['it
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56.
Consider
the
following statements :
57.
The quartz crystals used in oscillators
have •
I.
a high value
of Q.
2. stable characteristics with respect
to
time and temperature varimion.
3. two resonant frequencies, viz.,
series
md
parallel.
Which of these statements are correct?
(a) 1
and
2 only
(b) 1 and 3 only
(c)
2
and
3
only
{d) 1, 2 and 3
; ;:::t=C>-
r
Which of the following can
be
used
_as a- replacement for the logic circuit
shown ahove ?
{a)
ZerO NAND
or
NOR gate
(b) Single NOR gate
'
(c) Single NAND gate
{d) One NAND gate and one NOR
g•re
P DTQ J FFO
- A
24
58. Which one
of
the following
ts
equi
valent to the Boolean express1on
- - -
Y=AB+ BC+CA?
•)
Y=CA
-
- -
(b)
Y=BC+CA
- -
-
(c)
Y=AB+BC
- -
(rl)
Y=AB+CA
59.
Consider the following logic families:
'·
.
I_
TL
2 ECL
3. CMOS
Arrange
them
m order
of
decreasing
power
c;lissipation.
(a) 3, 2, l
(b) 1,3 ,2
c ) l , 2 , 3
(d) 2, 1, 3
tnot
used
'
•
c
·
,,
· •
•
· '
•
·
0
'--<
•
·
- --1=
•
••
•
'
What is the outp-ut
of
the code
convener
constructed using
a 4
bit full-adder MSI
circuit as shown in the above figure?
(a) 2-4-2-1
code
(b) Excess-3 code
(c) Biquinary code
(d)
EBCDIC code
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•
56.
f.i'""' Mfi\l
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61. Which one of the following s ~ t m m s
is correct?
A three input multiplexer wi l require
(a)
A
minimum
of
two stlect
l i n ~
and one output line
b)
One select line and
one
output
line
(o)
Three select lines and
one output
ljne
(d) Two select lines
and
two
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61 f . I ~ < ~ R l R ~ a ~ i t « ~ u;
•'lfFif
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'
66. f.t"" HRlt.-,
ADCs
1i'r 'ii'Tl'i:? ; amm
•
69.
¥ n -.iih:i'f 9it,
i't
B Cf.: iCft
31'R
'(1+114>\"'ili
b)
(d)
m
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-
73. A
message
source produces five
symbols with probabilities
of
occurrence
t•
i· and
k .-espedivcly. What ·
is the value of entropy of source ?
(a) (j.S bits/symbol
b) 1·025 bits/symbol
(c) 1·875 bits/symbol
(d) 2-375 bits/symbol
74 In a TV system, there are 525 lines per
frame and the picture rate is 30/sec.
What is the value of sync frequency
1
'
30
pulsesfsec
b)
525 pulses/sec
1555 pulses/sec·
d) 15750 pulses/sec
75. Match List I
with
List ll and
sele
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'
73. ~ tfihr -.i'rr t
' '
a) fu- '{
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80. Which one of the following statements
is c o r r e ~ r
-'With a clock f r e q u e n ~ y of 3MHz, the
execution time for the insti-uction "STA
addr" of 8085 will be
(a) 4333 ns
(b) 3975 ns
c)
3115
ns
d) 3960 ns
·81. Which one
of
the following statements
is correct
?
A microprocessor program written in
assembly language is a:anslated into
machine language. The number
of
instructions in the machine language
when compared with the number of
instructions in assembly language is
(a) More only
b) Same
(c) Less only
{d) Either more or kss
82. Consider the following:
The 16 bit register/register-pair which
cannot be Stored in stack using PUSH
instruction
is
, 1. HL
2.
SP
3.
PSW
4.
PC
.
Select the correct answer using tlle
code given below :
(a) .1 and 2
(b) I and 3
(c) 2 and 3
(d) 2 and 4
P DTQ .1 FFO - A
83. Which one
of
the following statements
is correct"
The
1/0
Method n ~ e in a micro
cOntroller is
(a) Hand shaking
b) Jnten:upti':'g
C) Direct Memory Access
(d) All three
of
the above
84
Which one
of
the
followi11g
statements
is
Correct ?
Temperature cGefficient of a lhcnnistor
"
(a) High
and
negative
(b)
High and positive
- c) Low and negative
d)
Low
and positive
85. Consider he following :
Measurement of currents of more than
lOA requires
J. CT
2. l T
•
3. Ancnuator
4 Hall effect probe
Select the correct answer using the
code given below :
(a) J only
(b) I or4
c )2o r3
(d) 3 or 4
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80. 8085
>M
~ ~ T '"STft. addr
&;
ffiit 011q
1 < ' 1 ~
'f.Ti'f
'f' T i'rm ,
~ 3
MHz
,,
(a)
4333 ns
(b)
3975
ns
(c) 3115
(d) 3960 ns
81.
~ . ;
&;
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'
86. A thermocouple ammeter gwes full
scale denection for
a
current of 10
amp.
'Nhen it reads one fourth of the scale,
then what is the current through
the
meter?
(a) 5·0 A
(c) 3·7 A
(d) 2·5 A
87. Match List T with List
If
and select the
correct answer using the code
g.tven
below the Lists :
List I List II
'
(Transducer)
A.LVDT
B.
Strain
gallge
C.
Tacho
generator
D. Phase
meter
Code;
•
A
2
(b)
2
(o) 3
(d)
5
B
4
4
I
I
P DTQ·J FFO
A
(Appropriate
sigrw.l
Conditioner)
I.
Anillog amplifier
2. Phase-sensitive
detector
3. Logarithmic
amplifier
4. Instrumentation
amplifier
5.
e r o ~ c r o s s i n g
deteCtor
c D
I 5
3
5
4
2
4
3
34
88. Which one of the following statements
is
not
correct ?
(a) Correctness m measurement re
quires both accuracy and precision
(b) Reproducibility and consistency are
e ~ : : p r e s s 1 n s that best describe
Jl'i ecision. in measurements
c) It is not possible to have prectse
measurements which are not
accurate
(d) An instrument
with·
2 .accuracy
is beuer than another with
5
accuracy
89.
What is the power factor
of
an a.c.
circuit under resonance
1
(4)
unity
b) 0·8 leading
(o)
0·5 leading
(d) 0·5 lagging
90. Match List I with List II and select the
correct
answer
usmg the code given;
below the
Lists :
List I
Bridges)
A. MaxweU
B. Hay
C. Shearing
D Wien
Code
A
4
b)
I
(c) . 4
d)
I
B
3
3
2
2
List If
Measurements)
1.
Frequency
2.
Capacitance
3. High 'Q' coil
4. Inductance
C D
2 I
2 4
3 I
3 4
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86
~ 'ffi"i '3lll'
10
amp m
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91
The A to D converter used in digital ,
instruments could be:
I.
successive approximation converter
' '
. flash co;mvcrtcr type
3.
dual slope
convener type
What is the correct sequence of the
increasing order
of
conversion
time
taken by these types?
(a)
I _ : 2 3
b)2-l-3
c) 2 3- 1
d)
1-3-2
92. Which one of the following statements
iS
correct?
In distortion factor meter, a
filter
is used
10
suppress
(a) d:c. component
(b) odd honnonics
{c) even honnonics
(d) fundamental frequency component
93. Which
of
the following units are present
in a spectrum analyzer?
1.
MiXer
2. Saw-tooth generator
3. Local oscillator
Select the correct answer m:ing the
code
given below :
a) 1 only
b) I and 3 only
c) 2
and
3
only
(d) l , 2 and 3
94.
What does the vertical line between
open circuit characteristics and zero
power factor characteristics
of
a
s y ~
chronous generator reprc.'Sent? ·
•
{a) voltage drop due
to
synchronous
reactance at rated current
b) voltage drop due to leakage react·
ance
at
rated current
{c) induced voltage in armature due to
resultant flux
(d) induced voltage in armature due to
field flux alone
P DTQ J FFO - A
36
·95. The industry-load on a three-phase
2200-volts supply line is 1200 kW at a
lagging power-factor
of 0·6.
In order
to
raise the line power-factor to
unity (neglecting
ll 1
the losses), what
is the kVA rating of a synchronous
condenser installed in parallel with the
load
and,
the
k
VA
rating
of
an
altemator
required to supply the new total load
?
a)
OO
kVA and 800 kVA respectively
b) 1000 kVA and 800 kYA respec-
tively
(c) 1200 kVA and 1000 kVA respec
tively
(d) 1600 kVA and 1200 kVA respec
tively
96..Match
List
I
with
list
I I
and select the
correct answer using he code given
below the i s t ~ :
List I
Motor)
A. Capacitor start
induction· motor
B.
Capacitor
start-
capacitor run
inductiOTl
motor
C.
Penmment
capacitor motor
D. Shaded pole
moto(
Code.-
A
a) 4
(b) 2
c)
4
d) 2
B
I
3
3
j
List
Charactelirtics)
c
3
I
I
3
I.
2
3.
4.
Low
starting
torque
High starting
torque
High starting
torque, better
power' factor,
better
efficiency
Inherently
self starting
but very
small starting
torque
D
2
4
2
4
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91. '114ti>i'i if 9 ;Jffi AID qf
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97
If under norma saturated condition in a
power transf
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97. 'lf ~ R i f < t h < > ~ i ; f s f o l a r'ftr
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102
103.
'
WA
,.
0
'
'
.,
A MOSFET rated for
15
A, carries a
periodic curren.t as shown in the above
figure. The ON state resistance of
the MOSFET
is
0-15 ohm. What
is
the
average
ON
state loss in the MOSFET?
(a) 3 · 7 ~ W
{b) 7-5 w
c)
15·0 W
(d) 30·0
w
In the single phase diode bridge_re.:Lifier
as shown
in
the above figure, the load
resistor
R=50 ohms. The
011rce voltage
V 200sinWI. wherew d n -x 50 radians
per
second. What is the power dissipated
in the load
resistor?
3200
w
•
(b)
400w
•
400 w
(d)
800 w
P-DTQ-J-FFO - A
104.
Q
''
L
7
'
T
A voltage commutation circuit is shown
in the above figure.
The
tum
off
time of
the SCRs is 50 micro-second. A safety
margin of
2
is to
be
incmporated. What
will be the minimum value of capacitor
to
be provided for proper commutation ?
{b)
1·44 pF
c) 0·91 J.lF
(d) Q.72 i F
105. _ three phase semiconverter feeds the
armature
of
a . >eparately
exciteo;J.
d.c.
motor supplying a non-zero torque. For
steady state operation, the
motor
armature cun:ent is found to
drop to
zero
at certain instances of time. At such
instances the voltage assumes- a value
that is
(a) e q u < ~ l to the instantaneous value of
dle a.c. pha-;e V(tltage
(b) equal to the instantaneous value of
the motor back e.m.f.
(c) arbitrary
(d) zero
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'"'
15
A ~
~ 9 if:.1 MO.SfET
ir Jl1 : io
m ~ f o m i t ¢ i f j f f i ~ l l \ •
-mfr
t I
MOSFET
'f;1
"If"
~ , . . ; - r 'J"fuir'l
0
15 ohm
t I
MOSI'ET
ii ii11i
til
,.
' ' ~ '1 11 ' -
(a) Vi.i
\V
( j 7 j w
(t) 15-0W
(d: 30·0 w
1:%-%'11 rlr6
ir,J ..:-
;;Jm
fif: :om: t m " m l7f
t
;m
~ f i l > : i ~ » =SO
ohm> t otJ-
v
=2C(l
sm w t.
IO'i
w
=
2lf x
s
twA
~ ~ · -
'; ] (
/?il% i V C H ' I ' l f ~ ?
3 2 ~ 0
IV
,.
,:,Jo
{bl ·
'
wo v
T
'
:m;
m
'i 1l. F 't'Rm f < l < t , q f l • 4 ~
fu;r.IT
lJ'IT
%I
SCR 1i;
fult
•W 'lill'f
5 D ~ ~ ~ I 2 f r f ~ ; J F
e_fi 1fild
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•
,
106. In which type of motor
h c ~ t a t i c
dynamic braking
is
veJy effective
?
•I
Cumulatively
compounded
DC
motor
(b)
DC series motor
(c) DC
~ u m
motor
(d)
Separately excited
de
motor
107. What are the advamages of oil-filled
cables
?
(a) No ionization, oxidation and forma
tion
of
·voids
(b) Possibility of increased temperature
ungc in service
c) Higher maximum
permissible
stre,ses
d) All
of the
above
For the power system network shown
ahove, the zero-sequence rcacLances in
p.u. are indicated. What is the zero
sequence driving point reactance of bus
3 in p.u.
1
a) 0-12
(b) 0-30
(c)
0 W
(d) 0·20
109. Thc1·c are 20 discs in the string of
.rnsulators of a 3-phase, 400 'kV
transmission line. String efficiency is
80 . What is the value
of
the maximum
vollage across any disc ?
P-DTQ-J-JIFO
- A
42
. (a)
16 kV
(b)
25 kV
c)
J3 x2S kV
(d)
25 kV
13
110.
What
is
the primary considemtion
in
deciding the conductor si7-C
of EHV
lines'?
(a) Voltage drop
b) Current density
c) Corona
d)
Voltage drop and current density
111. Which two
items
are connected by
a
tic
hne?
' '
Two power stations
(b)
Power station and load
centre
c)
Two generators
(d)
Systems
in
two areas
112.
Which
of
the
following relays is used
for
the protection of a series compensated
EHV line?
(a) Impcdanc:e relay
(b) Reactance relay
{c) Mho
relay
(d) Static distance relay/Microproces
sor based relay
113.
What is
the
order
of
the reactive power
consumed by an
HVDC converter?
(a)
Equal to real power
(b)
Equal to
25
of real
power
(c)
Equal to
50
of re
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'
06. % 1" 'l9iK ft
"lim:
i> •
~ ~ ~ ~
(a)
~ f i N DCli'm
(b)
D C ~ - . f r :
(c) DC m: :i'r:fuR
l ~ ~ w o n m f t r
Rit
111 H V D C ~ m 1 ~ ~ 1 l f r n
tl ilfhm t '
{a) ~ 1 l f r n i t ~
b ) · ~
j fu;
t 25%
t
OfUOI1:
(c) E
1M 5[1%
it
il\i1'\
(d) 1:19; il; 75% it
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D i r r c t i i m ~ :
Each of the next Seven (07) items consists of
two statemems,
Qne
labelled as the 'Assert10n
(A}' arrd the other as :Reason (R)'.
You
arc to
examine these
tw
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•
f . \ i ~
:
f
'il'f
filw
'''"'hfr
~ t m
~ f
~
'
lf"fi1''
Offill'\ "
..,
• , '
m
r i'i
Ii'r.r
~ ' f l ' l ; r t I
116. 'f'l"
:M
:
'l'mrl ~ tmr "·'·
; f r t i ~ ~ t l
~ (R}: ' < V ' < i l l ~ £ r r A A l l '
• ; f t d ~ i\ q;,;
q;;:([f I
45
117. 01"1
(A) :
~ li'>T'f z . ~
>:'if ~ H I
1l1(lJ[
·:R:
:
-fit; Z - - ~ t
m 1ft /-ifRi ' f8 'iffiiT t
'"" ~ « ~ ~ l > f k < 1fOiT 1fl
fo-m1 t I
T f l T [ \ R ~ : ~ ~ " 1 ~ 1 2
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it .i f
t. 'ff
i. : P-D
TQ-
J-FF
O
'
ffi1<
t>l il1"
1>41
.A
ff f
f'IT
f'l
'\l<
t
i ' l
f . i
~ : i l
~
'
JOfJ
.
' m
:n f
~
i
t ~
om:.
ar 'lf
V
t .
. ' f
ffi«>o
ll1
i
t
fm1: f
i f i
i
t; si I
~
-.i1
ft>n
Oi"T"o
/IT I
(i)
' ~ i f if;
W
~ q ; f < i i
t . ; ; ~
I
l < J O
iiT<
I g
('itq; n
'l it
fom
;
ftc
:
.-.-..:
ll ;'l'
liR
i t
m
~ f.
o-- :
% - ~
(0·3
3)
W: i t
¥
'1 i'f