1. Which of the following motors is inherently self starting ?

Split motor

Shaded-pole motor

Reluctance motor

None of these

Answer: Shaded-pole motor

Explanation:


2. In capacitor start single-phase motors ?

current in the starting winding leads the voltage

current in the starting winding lags the voltage

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

none of the above

Answer: current in the starting winding leads the voltage

Explanation:


3. Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because ?

it is comparatively cheaper

it has almost non-destructible capacitor

it has low starting as well as running currents at relatively high power factor

it is quiet in operation

Answer: it has low starting as well as running currents at relatively high power factor

Explanation:


4. Which of the following single-phase motors will be cheapest ?

Reluctance motor

Capacitor start motor

Capacitor run motor

all the above

Answer: Capacitor start motor

Explanation: