69.

70.

71.

72.

73.

74.

75.

A three-phase 415 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%.
The speed of stator magnetic field relative to the rotor magnetic field is :

(A) Zero (B) 50rpm
(C) 950 rpm ൯) 1000rpm

The full load slip of an induction motor depends on :
(A) Stator copper loss (B) Rotor copper loss
(C) Synchronous speed (D) None of the above

A three-phase cage induction motor is started by Direct-On-Line (DOL) switching at the
rated voltage. If the starting current drawn is 5 times the full load current, and the full load
slip is 5%. then ratio of the starting developed torque to the full load torque is approximately
equal to:

(A) 2.24 (B) 1.25
(C) 1.56 (D) 0.25

By design, what is the phase difference between the currents in the main winding and
auxiliary winding in a capacitor start single phase induction motor?

(A) 45 degrees (B) 90 degrees
(C) 120 degrees (D) 180 degrees

A 150 MW power station delivers 150 MW for 2 hours, 100 MW for 7 hours and is shut down
for rest of the hours of each day. Calculate the annual load factor if the plant is shut down for
25 days for maintenance work in a year :

(A) 20.56% (B) 30.5%
(C) 27.78% (D) 23.83%

When Sag is increased on the OH lines?
(^) Repair can be done easily (B) String efficiency is decreased
(C) String efficiency is increased (D) Tension is decreased
A load of 15000 kW with load current 80A is delivered by a 3 phase transmission line having

conductors each of resistance 1Q/km. Calculate the distance over which load is delivered
with a transmission loss of 6% :

(A) 46.88 km (B) 37.83 km
(0) 14.06 km (D) 39.45km

13 131/2023
[P.T.0.]