Electrical Engineering MCQs

Page No. 264

If the capacitor of a single-phase motor is short-circuited_________?


athe motor will not start

✓


bthe motor will run

✖


c the motor will run in reverse direction

✖


d the motor will run in the same direction at reduced r.p.m

✖



In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to_______________?


aimprove power factor

✓


bincrease overload capacity

✖


creduce fluctuations in torque

✖


dto improve torque

✖


View Answer improve power factor

In a split phase motor, the running winding should have?


ahigh resistance and low inductance

✖


b low resistance and high inductance

✓


c high resistance as well as high inductance

✖


dlow resistance as well as low inductiance

✖



In capacitor start single-phase motors____________?


a current in the starting winding leads the voltage

✓


bcurrent in the starting winding lags the voltage

✖


ccurrent in the starting winding is in phase with voltage in running winding

✖


dnone of the above

✖



In a capacitor start motor, the phase displacement between starting and running winding can be nearly__________?


a 10°

✖


b30°

✖


c60°

✖


d90°

✓


View Answer 90°

Which of the following motor will give relatively high starting torque ___________?


aCapacitor start motor

✓


bCapacitor run motor

✖


c Split phase motor

✖


d Shaded pole motor

✖


View Answer Capacitor start motor

Insertion of resistance in the stator of an induction motor___________?


aincreases the load torque

✖


bdecreases the starting torque

✓


c increases the starting torque

✖


dnone of the above

✖



The starting torque of a three phase induction motor can be increased by__________?


aincreasing slip

✖


bincreasing current

✖


c both A. and (b)

✓


dnone of the above

✖


View Answer both A. and (b)

The rotor of an induction motor runs at__________?


asynchronous speed

✖


b below synchronous speed

✓


cabove synchronous speed

✖


dany of the above

✖



In a star-delta starter of an induction motor___________?


aresistance is inserted in the stator

✖


breduced voltage is applied to the stator

✖


cresistance is inserted in the rotor

✖


dapplied voltage perl stator phase is 57.7% of the line voltage

✓



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