Single Phase Induction Motors MCQs

Option A: Capacitor run motor

Option B: Shaded pole motor

Option C: Capacitor start motor

Option D: Split phase motor

Correct Answer: Capacitor run motor ✔

Option A: a single turn of heavy wire which is in parallel with running winding

Option B: a single turn of heavy copper wire which is short-circuited and carries only induced current

Option C: a multilayer fine gauge copper wire in parallel with running winding

Option D: none of the above

Correct Answer: a single turn of heavy copper wire which is short-circuited and carries only induced current ✔

Option A: more than i.he rated torque

Option B: rated torque

Option C: less than the rated torque

Option D: zero

Correct Answer: zero ✔

Option A: the starting winding is connected through a centrifugal switch

Option B: the running winding is connected through a centrifugal switch

Option C: both starting and running windings are connected through a centrifugal switch

Option D: centrifugal switch is used to control supply voltage

Correct Answer: the starting winding is connected through a centrifugal switch ✔

Option A: the motor will not start

Option B: the motor will run

Option C: the motor will run in reverse direction

Option D: the motor will run in the same direction at reduced r.p.m

Correct Answer: the motor will not start ✔

Option A: improve power factor

Option B: increase overload capacity

Option C: reduce fluctuations in torque

Option D: to improve torque

Correct Answer: improve power factor ✔

Option A: high resistance and low inductance

Option B: low resistance and high inductance

Option C: high resistance as well as high inductance

Option D: low resistance as well as low inductiance

Correct Answer: low resistance and high inductance ✔

Option A: current in the starting winding leads the voltage

Option B: current in the starting winding lags the voltage

Option C: current in the starting winding is in phase with voltage in running winding

Option D: none of the above

Correct Answer: current in the starting winding leads the voltage ✔

Option A: 10°

Option B: 30°

Option C: 60°

Option D: 90°

Correct Answer: 90° ✔

Option A: Capacitor start motor

Option B: Capacitor run motor

Option C: Split phase motor

Option D: Shaded pole motor

Correct Answer: Capacitor start motor ✔