Electrical Engineering

Topic : Induction motors

Multiple Choice Questions and Answers

latest MCQ for all competitive exams : 

1. In a split phase motor, the running winding should have

(a) High resistance and low inductance

(b) low resistance and high inductance

(c) high resistance as well as high inductance

(d) low resistance as well as low inductiance

Ans: b

2. If the capacitor of a single-phase motor is short-circuited

(a) the motor will not start

(b) the 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.

Ans: a

3. In capacitor start single-phase motors

(a) current in the starting winding leads the voltage

(b) current in the starting winding lags the voltage

(c) current in the starting winding is in phase with voltage in running winding

(d) none of the above

Ans: a

4. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to

(a) improve power factor

(b) increase overload capacity

(c) reduce fluctuations in torque

(d) to improve torque

Ans: a

5. In a capacitor start motor, the phase displacement between starting and running winding can be nearly

(a) 10°

(b) 30°

(c) 60°

(d) 90°

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