No. 
Question 
1 
The RMS value of the voltage u(t) =3 + 4cos (3t)
is 
Options 
A)
V 
B) 5 V 
C) 7 V 
D) (3 + 2
) V 

Correct Answer 
A 

2 
The open loop transfer function of a unity feed
back control system is given as G(s) =
The value of ‘a’ to give a phase margin of 45° is equal to 
Options 
A) 0.141 
B) 0.441

C) 0.841 
D) 1.141 

Correct Answer 
C 


3 
The armature resistance of a permanent magnet dc
motor is 0.8 W. At no load, the motor draws 1.5 A from a supply voltage
of 25 V and runs at 1500 rpm. The efficiency of the motor while it is
operating on load at 1500 rpm drawing a current of 3.5 A from the same
source will be 
Options 
A) 48.0% 
B) 57.1%

C) 59.2% 
D) 88.8% 

Correct Answer 
A 

4 
The solution of the first order differential
equation x(t) = 3x(t), x (0) = x_{0} is

Options 
A) x (t) = x_{0} e^{3t} 
B) x (t) = x_{0} e^{3}

C) x (t) = x_{0} e^{1/3} 
D) x (t) = x_{0} e^{1} 

Correct Answer 
A 

5 
The unit impulse response of a second order
underdamped system starting from rest is given by
c(t) = 12.5 e^{6t }sin 8 t, t
0
The steadystate value of the unit step response of the system is equal
to 
Options 
A) 0 
B) 0.25 
C) 0.5 
D) 1.0 

Correct Answer 
D 

6 
A singlephase, 230 V, 50 Hz, 4 pole,
capacitorstart induction motor has the following standstill impedances
Main winding Z_{m} = 6.0 + j4.0 W
Auxiliary winding Z_{a} = 8.0 + j6.0 W
The value of the starting capacitor required to produce 90° phase
difference between the currents in the main and auxiliary windings will
be 
Options 
A) 176.84 mF 
B) 187.24 mF 
C) 265.26 mF 
D) 280.86 mF


Correct Answer 
A 

7 
A singlephase halfcontrolled rectifier is
driving a separately excited dc motor. The dc motor has a back emf
constant of 0.5 V/rpm. The armature current is 5 A without any ripple.
The armature resistance is 2W. The converter
is working from a 280 V, single phase ac source with a firing angle of
80°. Under this operating condition, the speed of the motor will be 
Options 
A) 339 rpm 
B) 359 rpm 
C) 366 rpm 
D) 386 rpm 

Correct Answer 
C 

8 
The 8085 assembly language instruction that
stores the content of H and L registers into the memory locations 2050_{H}
and 2051_{H}, respectively, is

Options 
A) SPHL 2050_{H} 
B) SPHL2051_{H} 
C) SHLD 2050_{H} 
D) STAX 2050_{H}


Correct Answer 
C 

9 
A 50 Hz, 4pole, 500 MVA, 22 kV turbogenerator
is delivering rated megavoltamperes at 0.8 power factor. Suddenly a
fault occurs reducing is electric power output by 40%. Neglect losses
and assume constant power input to the shaft. The accelerating torque in
the generator in MNm at the time of the fault will be 
Options 
A) 1.528 
B) 1.018 
C) 0.848 
D) 0.509 

Correct Answer 
A 

10 
The Nyquist plot of loop transfer function G(s)
H(s) of a closed loop control system passes through the point (1, j0)
in the G(s) H(s) plane. The phase margin of the system is 
Options 
A) 0° 
B) 45°

C) 90° 
D) 180°


Correct Answer 
D 

11 
A 50 kW dc shunt motor is loaded to draw rated
armature current at any given speed. When driven
(i) at half the rated speed by armature voltage control and
(ii) at 1.5 times the rated speed by field control, the respective
output powers delivered by the motor are approximately. 
Options 
A) 25kW in (i) and 75kW in (ii) 
B) 25kW in (i) and 50kW in (ii)

C) 50kW in (i) and 75kW in (ii) 
D) 50kW in (i) and 50kW in (ii) 

Correct Answer 
B 

12 
A hydraulic turbine having rated speed of 250 rpm
is connected to a synchronous generator. In order to produce power at 50
Hz, the number of poles required in the generator are 
Options 

Correct Answer 
D 

13 
For the equation x(t)+3 x(t) +2x(t) = 5, the
solution x (t) approaches which of the following values as t ® ¥ ? 
Options 

Correct Answer 
B 

14 
The following motor definitely has a permanent
magnet rotor 
Options 
A) DC commutator motor 
B) Brushless dc motor

C) Stepper motor 
D) Reluctance motor 

Correct Answer 
C 

15 
A110 kV, single core coaxial, XLPE insulated
power cable delivering power at 50Hz, has a capacitance of 125 nF/km. If
the dielectric loss tangent of XLPE is 2 x 10^{4}, the
dielectric power loss in this cable in W/km is 
Options 
A) 5.0 
B) 31.7

C) 37.8 
D) 189.0 

Correct Answer 
D 

16 
The simultaneous application of signals x(t) and
y(t) to the horizontal and vertical plates, respectively, of an
oscilloscope, produces a vertical figureof8 display. If P and Q are
constants, and x(t) = P sin (4t + 30), then y(t) is equal to 
Options 
A) Q sin (4t  30) 
B) Q sin (2t + 15)

C) Q sin (8t + 60) 
D) Q sin (4t + 30) 

Correct Answer 
B 

17 
A 500 MW 3phase Yconnected synchronous
generator has a rated voltage of 21.5 kV at 0.85pf. The line current
when operating at full load rated conditions will be 
Options 
A) 13.43 kA 
B) 15.79 kA

C) 23.25 kA 
D) 27.36 kA 

Correct Answer 
B 

18 
Total instantaneous power supplied by a 3phase
ac supply to a balanced RL load is 
Options 
A) zero 
B) constant

C) pulsating with zero average 
D) pulsating with nonzero average 

Correct Answer 
B 

19 
The equivalent circuit of a transformer has
leakage reactances X_{1} , X 
Options 
A) X_{1}>> X 
B) X_{1}<< X 
C) X_{1}» X 
D) X_{1}» X 

Correct Answer 
D 

20 
If P and Q are two random events, then the
following is TRUE

Options 
A) Independence of P and Q implies that probability
(P
Q ) = 0

B) Probability (P
Q )
Probability (P) + Probability (Q)

C) If P and Q are mutually exclusive, then they must
be independent

D) Probability (P
Q )
Probability (P)


Correct Answer 
D 