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AE Previous Year Question Papers Code I Q. Booklet
1.
In two wattmeter (A)
method of ::3-phase power measurements,
the readings of the two wattmeters
B
when the power factor is 0.5
are equal and positive
(B) . the readings
2.
~)'
of the two wattmeters are equal and opposite the total power is measured by only one wattmeter
(D)
the readings of the two wattmeters
The reading of the wattmeter connected to measure the reactive power in a 3-phase circuit is given by zero when the line voltage is 400 volts and the line current is 15 Amps. Then the power factor of the circuit is (A)
3.
are not equal and positive
(B)
zero
0.6
(C)
(D)/ unity
0.8
The resistance which should be connected between transfer of power from source to the combined load is
terminals
P and Q for maXimum
I
I I I I I J
+
p
: Combined :I load
40
lOV
I I I I I
Q : I J J J
I I I I
I ______________________________
(A)
4.
zero L\
(B) 2.n
1
JC) 4 0
In the given circuit below, the current is in volts is
i(t)
==
(D)
4sin(500t) Amps. The applied voltage v(t)
i(t)
100 20mH
(A)
40sin(500t)
(C)
40 cos(500t)
)B)
infinity ohms
56.56sin(500t + 45')
(D) 56.56cos(500t
+ 45')
I
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Code Q. Booklet I n a twn port network, open circuit impedance parameters
\7;
,11 in terms of
fBI-.J L!;
express
Vz, 12
\\'hen two 2-port networks are connected in parallel,
it is Gonvenient to use
open circuit impedance parameters (B)
short circuit admittance transmission
cm
parameters
parameters
inverse hybrid parameters
On increasing the Q-f<1ctorof a coil (A)
its power factor increases
..Dfi
its power factor decreases
(G)
its power factor remains unaltered
(D)
its power may increase or decrease
Tlw value of current at resonance in a series RLC circuit is affected by the value of (A)
R
(B)
The equivalent inductance
L
(C)
C
(E»
of the below given circuit at the terminals
R,L and C
P - Q is
2H
(A)
-2012
4
II
(D{
2
II
(C) 4
6
II
(D) 8 II
www.previouspapers.in Q. BookI.et Code \ capacitor C at time I = 0' with initial charge Qo acts as \) short circuit (B) open circuit current source (e)
1 Jdl
electrical network with 8 independent
\)1
LQl IIBil
~H) voltage source
nodes will have
nodal equations
(B)
8 nodal equations
7 nodal equations
(D)
9 nodal equations
/
I:
! mpedance
Zl
(\)
n
2l_80'
transformer
:)
(B)
Z2 = 2150°
10130'
n
n . Then (C)
meters
(B)
pulse transformers
;-.\vamping resistance )
If>
2°150° nand
'nmsformers used in conjunction with measuring dLage and high currents are called ,\)
14
C:C
~
Z2
2130°
is
n
instruments
is used in moving coil instruments .(B)
(D)
of high
power transformers
(D)/ instrument
therrnal EMF power taken by instrument
for measurement
transformers
to reduce error due to
temperature galvanometer
sensitivity
is required to measure pf of an electrical load. No power factor meter is available. The lowing combination is used to determine pf a wattmeter
i
a voltmeter and ammeter
,
i'j (.1)
Hi,
Tile dielectric loss of a capacitor can be measured by \)
17
a voltmeter, ammeter and wattmeter a kwh meter
Wein bridge
(B)
Owen bridge
Schering bridge
(D)
Maxwell bridge
(B)
Selsyn
(D)
Photo emissive cell
C ,le of the following is an active transducer Strain gauge (( ') Photo voltaic ceU-
5
GET-2012
www.previouspapers.in 18.
Code I Q. Booklet The breakaway (,)
(.)_
B
I
point of the root from the real axis for a closed loop system with loop gain
K(s+10)
.
C s H s - (s+·2, )(s+5 \ hes
19.
(A)
between -10 and -
(C)
between -2 and origin
(B); at -
OJ
qj}.
OJ
between -2 and -5
A system has 12 poles and 2 zeros. Its high frequency
asymptote
in its magnitude
plot
will have a slope of (A)
20.
-60 db/dec
(B)
-120 db/dec
!(C)
-200 db/dec
(D)
-240 db/dec
The Nyquist plot of a transfer function is shown in the figure. The gain margin is JCO
0.2
-3
(A)
21.
22.
(B)
5
8
(C)
10
(D)
15
If the Gain of the open loop system is doubled, the gain margin (A)
gets one fourth
(C)
gets doubled
,.(13)
(D)
gets halved is not affected
The maximum phase shift that can be obtained by using a lead compensator with transfer
f
t·
une 'lOn
C() 4(1+0.15s). 1 s = (1+ 0.05s ) IS equa to
(B)
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30°
6
www.previouspapers.in 23.
25.
26.
')~ :..
,.
9
'v(:f~)
TnP
The ideal operational (A)
Ri
(D.~,;;" )('(J/
R
1
0.9
jLF
(C)
9F
(D)
J
JLF
amplifier has
==
rJJ,
Ro
=: 00
(B)
R
==
0
R0
==
00
ccc
CJJ
R0
==
0
(D)
Rl
==
0 ,. R ()
==
0
(B)
RCA
(D)
National semiconductor
'
1.8
In the LM741, LM stands for (1\) Motorola (C) Texas instruments
t;
ADC preferred for digital panel meters and multimeters (A) Flash ADC (B) Servo ADC (C) Successive approximation ADC (D) Dual-slope ADC
The output of an op-amp voltage follower is a triangular wave as shown in fig. for a square wave input of frequency 2 MHz and 8 V peak to peak amplitude. The slew rate of the op amp is
+ 3V
-3V
~
28.
B
In a monostable multivibrator using 555 timer, the time delay is 100m sec, timing resistor IS 100 k n, the villue of timing capacitor is (A)
24.
Code I Q. Booklet
6 ps
(B)
8 V / ps
(C)
14 V / ps
Match the following with parts in List-! with machines in List-II List-! List-II I rotor barsbars commutator 3. r-l damper r-1 2. r-2 r-3 1. dc ind machine uction machine q-3 q-2 q-2 (D) p--1 q-l GET-2012 synchronous machine(B) p-3 p. p~-2
(D)
14 ps
www.previouspapers.in 29.
:30.
The following is the apparent two-wmding transformer
disadvantage
of auto
transformer
(A)
power rating is greater
(B)
efficiency is low
Je)
conductive isolation is not present
(D)
voltage regulation
lV 230/2300 V, Y/ L'l current/phase
(A)
31.
Code I Q. Booklet
3-phase
transformer
is rated
B
as compared
I
to
is low
at 230 KVA. Its rated
secondary
is
33.33 A
A 3-phase induction
(B)
133.33 A
(C)
66.66 A
motor is run in counter-clockwise
(D)
direction
30.33 A
as motor with reverse
phase sequence of supply. The range of slip variation for this mode is (B)
32.
(C)
2< s < 1
0 < s <-1
(D)
3
The following is phasor diagram of rotor variables of 3-phase induction motor with Ej as injected emf. This provides
flux
I ,
,/
/ //
/,/: I 12 ZZs I
sEz
(A)
sub synchronous
(B)
super synchronous
(C)
sub synchronous
(D)
super synchronous
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speed without pf improvement speed without pf improvement speed with pf improvement speed with pf improvement
8
www.previouspapers.in 33.
Code Q. Booklet
The variation machine
of synchronising
power for variation
I
of power angle for a salient
B
pole
wiU be
PSY
(B)
o
ex
o
-90
+90
Psy
I
(C)
I
\
I
(D) ex
--90
34.
',:>ex
+90
If the supply frequency and voltage applied to a synchronous fractions
35.
I
~
- 90
+90
motor are both reduced to
KI, KV the maximum power of the motor becomes
(A)
K times of
(C)
K2
times of
Pmax
P.nax
at
at
'I' 1
For a salient pole synchronous
machine,
(B)
~ times of K
(D)
I~2 times of
Pmax
Pmax
at
1
at 1
when the speed becomes super synchronous,
during hunting, the damper bars develop (A)
synchronous
motor torque
(C)
induction motor torque
(B) .,(D)
9
dc motor torque induction generator torque
I
www.previouspapers.in Q. Booklet Code I 36.
B
The output waveform given below can be obtained from
I
I
I I I
,
I
(A)
Controlled rectifier
(B)
AC chopper
(C)
DC chopper
wt
~I1) DIAC-TRIAC phase control circuit
37.
/
/j-i r"
The candle power of a lamp placed normal to a working plane is 30 C.P. Find the distance if the ill umination is 15 lux; .
;-:c:(i
(A)
C"
38.
40.
41.
,\ f.,(B)
1'- • ....-:-
'":-
~JC(/ 1.414
..---/
...-
4J...,/Q
Xo"
The luminous intensity (A)
3~)
\
0.5 2m ~.. m
750 lumen ff
m
CD)
1 -m
J2
of a lamp is 750 C.P. Then the flux given out is (B)
750ff
lumen
Furnaces used for electric crematorium
750 lumen
(C)
2ff
)D)
1500ff lumen
are of type
(A)
Resistance heating
(B)
Induction heating
(C)
Dielectric heating
(D)
Arc heating
For the same rating the amount of radiant heat produced is least in (A)
fluorescent lamp
(B)
filament lamp
(C)
sodium vapour lamp
(D)
mercury vapour lamp
In electric traction, the friction at the track is proportional
1 speed
GET--2012
(B)
1
(C)
(spe~dY
10
speed
to CD)
(speed)2
I
Code Q. Booklet 42.
www.previouspapers.in
1.7321150
(B)
(B)
24
Given maximum
power
capacitor compensation (A)
45.
(D) 19
transmitted
through
a line
Pmax
(B)
(A - ~X;
Pnwx'
then
with 60% of series
the maximum power transfer becomes
In A,B,C,D parameters,
(A)
0.6
ZL/2
in the T-equivalent
(B)
(D)
0.6 Pm ax
shown can be represented
as
Z L /2
(A -l)B
(C)
(A -l)/C
(D)
B/(A -1)
An industrial COl'~;umerhas a load of 1500 kw at 0.8 pf lag. for 12 hrs and 1000 kw at Upf for 12 hrs during a day. The daily load factor of the consumer is (A)
47.
1.7321 -- 150
~37
7
Z L /2
46.
(C)
21- 60
The number of strands on a 3-1ayer cable is (A)
44.
I
Polar form of (1- 02 + 0) is (A)
43.
IB
0:666
(1)r~8:3:3
(C)
0.8
(D) 1.25
In a power system with negligibie resistance, the fault current at a point is 8.0 pu; The series reactance to be connected at t!le fault point to reduce the short circuit current to 5.0 pu is (A)
3.0 pu
(B)
0.25 pu
(C}/ 0.075 pu
\.-/
11
(D)
0.125 pu I
GET-2012 I
www.previouspapers.in Code Q. Booklet 48.
Merz-price protection is more suitable f()l' (A) transformers (C)
49.
transmission
lines
The load torque vs speed characteristic
fBr
generators
(D)
loads
of an industrial
load is given below
N
The motor suitable for the above load is (A)
dc shunt motor
(B)
3 phase induction motor
(C)
dc series motor
(D)
capacitor motor
,//
50.
Between 2 supports, due to sag, the conductor takes the shape of (A)
51.
parabola
(B)
hyperbola
In suspension type insulator, (A)
top disc
(B)
centre disc
~Q)
catenary
the potential drop is maxim um across
CD) lowest disc (D) 52.
53.
depends on number of discs of the string
The chances of occurrence of corona is maximum during (A)
dry weather
(C)
winter
,jB) (D)
humid weather hot summer
Equal area criterion can be applied to (A)
multi machine systems
(B)
to any system with any number of loads and generators
J.Gr~single machine connected to infinite bus system (D)
(D)
system with induction machines
semi circle
I
B~
www.previouspapers.in 54.
55.
Q. Booklet
Code
B
An ideal current source has zero (1\..)
internal conductance
(B)
internal resistance
(C)
voltage on no load
(D)
ripple
Three resistances of 1 ohm, 2 ohms and;) ohms are connected in delta. These resistances are to be replaced by star connection as shown in the figure below, maintaining the same termjnal conditions.
nR
R
y
y B
The value of highest resistance
1
- ohm
(A)
56.
(B)
4
Superposition
B in star will be :
1
- ohm 3
(C)
1
-- ohm
\(Dj/
2
1 ohm
theorem requires as many circuits to be solved as there are
(A)
sources
(B)
nodes
(C)
sources + nodes
,~
sources + nodes + meshes
108
n
57.
p
F
A
G
H
9n The circuit shown above can be easily solved by (A)
Series-parallel
network
(C)
Thevenin's theorem 13
{B)
Star-mesh
(D)
Reciprocity theorem
theorem
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ir
www.previouspapers.in Code I Q. Booklet 58.
At half power frequencies, the current in the RLC series circuit is 111 ---. // -J3 12 x current at resonance (A) (D) (~''-127 x current at resonance
59.
In RLC circuits, the current at resonance is
resonance nce
(A)
maximum in parallel resonance and minimum in series resonance
JB)/- maximum in series resonance and minimum in parallel resonance
60.
(C)
maximum in both series and parallel resonances
(D)
minimum in both series and parallel resonances
The equivalent inductance
of the circuit between terminals
P and Q is equal to
(L] +L2 +2M) P
JfJL, -M')) (L]L2 (L1 + L2- +M2) 2M
(A)
Q
L1
(<;)
(B)
(D)
(L] + L2
2M)
-
(L]L2
-
M2)
(L]L2
-
M2)
(L]+L2-2M)
61.
In the given circuit below, the voltage across the inductor is lOon
1 Henry
100 Hz 2;r
(A)
GET-2012
220
-j2
volts
(B)
22012 volts
(C)
14
220 volts
(D)
110 volts
B
I
Code I Q. Booklet
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(~j)
B
I
In the given R - C circuit, the current reaches its maximum value ~
VVVV\I
S
100 n
10 volts D.C.
i i
(AJ
after 50
(B)
after 100
(C)
after 1000
Ji.
sec. of turning on the switch S
Ji.
sec. ofturning on the switch S
Ji.
sec. of turning on the switch S
(D) immediately after turning on the switch S
63.
The time constant of a series R - L circuit is given by (C)
64.
LR
/L {Df/ R
For the circuit given below, the current through 1 ohm resistor will be
10
L
8 Volts
10 Volts, (A)
65.
(B)
4 amps
6 amps
(D) 8 amps
susceptance
(D) reactance
Admittance is the reciprocal of '.~
66.
2 amps
50Hz
impedance
(C)
(B) inductance
The power expression in 3-phase circuit in terms of line voltage
VL,
line current I Land
power factor of the load is .J3 VLI L cos¢ where ¢ is the angle between ~/line
voltage and line c'6.rrent
(B) line voltage and phase current
(C) phase voltage and line current
(D) phase voltage and phase current 15
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www.previouspapers.in Code I Q. Booklet 67.
The open loop transfer function of a unity feedback control system is given by
K c( s ) ,,~-----8(S
+ 1)
If the gain K is increased to infinity then the damping ratio will tend to become
(B) 1
(A)
68.
(C)
0
(D)
The overall gain for the block diagram shown below is given by
iIl
69.
70.
71.
co
out
(A)
(~.v
(C)
(D)
Which of the following systems does have the tendency to oscillate? (A)
closed loop system
(B)
open loop system
(C)
either (A) or (B)
(D)
both (A) and (B)
The feedback system with characteristic
equation
s,j -j 2K8:3 + S2 + 58
-+-
5 = 0 is
(A)
unstable for all values of K
(B)
stable for all values of K
~/
stable for positive values of K
(D)
stable for zero value of K
For making an unstable system as stable system (A)
gain of the system should be decreased
(B)
gain of the system should be increased
(C) the number of zeros of the loop transfer SDJ/
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function should be increased
the number of poles of the loop transfer function should be increased
16
B
I
www.previouspapers.in 72.
Code I Q. Booklet For the BJT shown in fig.,
VBE :::: O.7V,
100, find 1B
fJ::::
B
I
Vcc:::: + 20V
2K 430K
f---o
Vo
lK
(A)
73.
36.35 pA
19.3 ,itA
The value of transconductance IJ)ss ::::9 mA and Vp (A)
74.
(B)
6mV
:::: -3V
(B)
(C)
38.6 mA
(D)
57 pA
at a bias voltage of 0 V for the JFET which is having
is
6m3
The efficiency of a class B amplifier
(C)
273
for a supply voltage
(P1/
yo
3m3
Vcc ::::24V with peak-to-peak
output of 6V is (A)
75.
4%
(B)
48%
(C)
19.6%
(D)
39.2%
The ripple voltage of a FWR with a 100 pF filter capacitor connected to a load of 50 mA IS
(A)
76.
2.4 V
The timing resistor
(B)
1.2 V
(C)
4.4 V
(D) 6.6 V
is 10 kG and timing capacitor is 200 PF for a 565 PLL. The free
running frequency is (A)
500 KHz
(B)
350 KHz
(C)
17
250 KHz
(D)
150 KHz
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www.previouspapers.in Q. Booklet Code I 77.
I
A dc motor is driving a load that requires constant output power. The pu value of torque with it.s field current reduced to half would be (consider rat.ed quantities as 1.0 pu)
\S~/
78.
B
0.5 pu
(B)
1.0 pu
A 2-pole wave wound dc generator
(C)
2.0 pu
has 120 conductors
(D)
1.5 pu
in each parallel
path of its
armat.ure. If it. is driven at. 1200 rpm and excit.ed to have 0.02 wb/pole, the induced emf would be // (B) 96 V (C) 24 V (D) 124 V (k( 48 V
79.
The variation of open circuit emf of a separates
If
excited generator when
= constant 'i,; I"~ '"
variable speed would be."
"'J;"'>
and >~
"
Speed
0\)
(~Q)
81.
1
(B)
A 220V/12-0-12 would be
(C)
2
V transformer
3
(D)
has an emf/turn of 1 V. The number of turns on secondary
(A)
12 with centre tap
(B)
220 with centre tap
(C)
24 with no centre tap
(D)
24 with centre tap
An ideal ¢m
(t)
(A)
GET-2012
transformer
= -0.05(t2
-5(t-l)
-
2t).
has
4
NI = 100 turns
N2
=:
200
turns
with
a mutual
The induced emf of secondary in volts is (B)
-lO(t -1)
~. 18
-20(t-1)
flux of
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B
Code I I Q. Booklet Four conductors in a stationary armature (alternator) are shown as 1,1',2,2'. For given
82.
direction of rotation of rotor the direction of induced emf (at the instant shown) in the conductors respectively
1
2'
00 0
2' 0 0®®0 I'®0® ® 1® 2 Conductor
(k)/
,/'-
l-
f 83/
~./
A synchronous machine has Xs = 1 pu and operates at V = 1 pu. Wben its emf is 1.5 pu with load angle 0:, current as (0 + jO. 5), the mode of operation is (B)
(A) generator with lagging pf (C)
\84.
\
generator with leading pf
(D) motor with leading pf
motor with lagging pf
A 3-phase, 16-pole, 108-slot alternator will have the following phase grouping in each
.
-
phase with 60° phase spread (A) 2, 2, 2, 2 coils in basic unit of 4 poles (B)
3, 2, 2, 2 coils in basic unit of 4 poles
(C)
3, 2, 2, 2 coils in basic unit of 16 poles
(D) 2, 2, 2, 2 coils in basic unit of 8 poles 19
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Q. Booklet Code I
B
For the power circuit given below, SCR is operated at 1 KHz with TONof 0.5 m sec.
--f
200V
V
~
Motor ratings: 200 V (dc), 1000 rpm, 10 A. Neglecting armature resistance the speed of motor at given duty cycle (Tm= constant) (C) 1500 rpm (D) 750 rpm (A) 1000 rpm (B) 500 rpm
86.
A converter is feeding a de machine as shown below:
o
-E
t Va
~
+ The mode of operation of machine is (A) Motoring Plugging (C) 87.
/-
ckB)-
(D)
Regenerating Rheostatic braking
The output of a single phase inverted bridge is as given below:
V wt
-V'-------------·-----------
In the above output voltage
(A) (B)
3rd, 5th,
~C)
3rd, 9th,
(D)
3rd, 7th
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5th
and
harmonics will be absent 7th harmonics will be absent 15th harmonics will be absent harmonics will be absent 7th
20
I
Code I Q. Booklet A 4-pole
turbo
generator
437.8 ele.degrees/sec2;
rated
500 MVA, 22 KV has
angular
1500 rpm/sec
(B)
36.48 rpm/sec
(C)
145.92 rpm/sec
(D)
72.97 rpm/sec
having H :::;6 MJIMVA is connected
H :::;4 M,J/MVA through
acceleration
a network of reactances.
to synchronous
The generator
motor having
is delivering power of
1.0 p.u. to the motor which reduces to 0.6 p.u. when fault occurs. The angular acceleration in ele.degrees/sec2 is (A)
90.
Synchronizing (A)
91.
(B)
360
180
(C)
1800
power coefficient can be written as
P', . cos 50
(C)
Heactance relay
(e) Mho relay
92.
(D)
1500
p',.cos5o
The relay that most likely to operate during power swings is (A)
(B)
Impedance relay
(D)
Bucholtz's relay
An aCB is rated 1500 A, 2000 MVA, 33 KV. Its making current in kA is (A)
51.51
(B) . 35
(C)
89.25
'" I>
415)/154.54 o.A- .~ ~.\:.~Q..~
The rating of lightning arrester (A)
94.
220 kV, 10 kA
A generating
station
I
It is equivalent to
(A)
A 50 Hz generator
its
B
(B)
~
-
used for 220 kV, 3 phase system is
220 kV, 5 kA
has maximum
(C)
198 kV, 10 kA
(D)
198 kV, 2 kA
demand of 30 MW, a load factor of 0.6 and plant
capacity factor 0.48; The reserve capacity of the plant is / 19.5 MW (C) (A) 37.5 MW 7.5MW
M
21
(D)
12 MW
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Q. Booklet Code I 95.
A transformer value is (A)
96.
99.
of 10 MVA, 33 KV has reactance 0.1 pu. On 20 MVA, 11 kV the new p.U (B)
0.45
1.8
(C)
l·J
" CD)
O.E)
L-G L-L-L-G L-L L-L-O
CD) (B)
In a single machine connected to infinite bus bar system, alternator voltage is 1.5 pu its reactance is 1.0 pu are connected through a line reactance of 0.3 pu. The maximum steady state power transfer is (A)
98.
~
In which type of fault, zero sequence currents are absent'? (1\:)
97.
B~l
1.154 pu
(B)
1.5 pu
(C)
5.0 pu
(D)
0.76 pu
Value of acceleration used in Gauss-Seidal --.._-----_._---~. __factor __ ._._-
method in load flow studies is
(A)
1.0
.
1.59
(B)
1.66
(C)
"(6)'.
1.6
The Z-Bus of the following system of impedances j.5
j.OS
j.OS
~
1
(A)
100.
I
110.08 )0.5] rjO.08 [jO.08jO.08 jO.~8] -;0.08] jO.5]
2
(D) (B)
j.2
L ].08 jO.08 jO.D8 )0.58 l.-
An over current relay having a current setting of 125% is connected to a supply circuit through a current transformer of ratio 400/5. The pick-up value will be (A)
GET-2012
6.25 A
(B)
(e)
500 A
22
100 A
(D)
80 A
