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Single Phase Induction Motors - Interview Questions and Answers

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1. 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
Explanation:
2. A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will
A. start and then stop
B. start and run slowly
C. start and run at rated speed
D. not start at all
Explanation:
3. The speed ofa universal motor is usually reduced by using
A. gearing
B. belts
C. brakes
D. chains
Explanation:
4. The starting winding of a single-phase motor is placed in
A. armature
B. field
C. rotor
D. stator
Explanation:
5. Which of the following statements regarding hysteresis motor is in incorrect ?
A. It is extremely sensitive to fluctuations in supply voltage
B. Its high starting torque is due to its high rotor hysteresis loss
C. It is extremely quiet in operation
D. It accelerates from rest to full-speed almost instantaneously
Explanation:
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