65.

66.

67.

68.

69.

70.

71.

The gate signal for the switching of a buck converter is shown below. Determine the output
voltage of the converter, if the input voltage is 100 V:

10V
‏عع‎ 40 110 140 (sec)
(A) 100V (8) 80%
(0 10V ൬) 40%

The speed and torque of a DC motor at a particular output power are 1000 rpm and 100 Nm.
Calculate the torque of the DC motor rotate at a speed of 500 rpm under the same output

power is:
(A) 100Nm (B) 200Nm
(C) 50Nm (D) 400Nm

1

The power factor of the possible load connected at

zero voltage regulation at full load is:

(A)
(0

Unity (
Leading

டு)

the secondary side of a transformer for a

B) Lagging

Zero

it is observed that the frequency of the stator and rotor currents of a three phase 4-pole
induction motor are 50 Hz and 2 Hz respectively. Calculate the slip of the motor :

(A) 0.5 (B) 0.02

(© 0.01 (D) 0.04
The developed reluctance torque in a salient pole synchronous motor is maximum at a load
angle of :

(A) 45° (B) 75°

(© 0 (D) 90°

The main losses responsible to damp the hunting p
(A)
(C)

Rotor iron losses (

Stator iron losses

The synchronous reactance (Xd) of a generator 100

pu for a base of 200 MVA and 20 kVis:

(A) 0.5 (
(0 2

18

டு)

hhenomena in a synchronous machine is :
B)

Rotor copper losses

Stator copper losses

MVA and 10 KV is 0.5 pu. The Xd value in

0.25

0) 1

231/2023
[P.T.0.]