AC SINGLE PHASE MOTOR - Practice Mode

1) What is the effect if the centrifugal switch is not disconnected after the motor starts?

Motor will run normally Motor will stop immediately Starting winding will burn out Motor will run very slow speed

Correct Answer: Starting winding will burn out

2) How the direction of rotation of repulsion motors is to be reversed?

By shifting the brush-axis By interchanging the supply terminals By changing the main winding terminals By changing the compensating winding terminals

Correct Answer: By shifting the brush-axis

3) Why a capacitor is connected across centrifugal switch in the centrifugal switch speed control method?

To maintain constant speed To protect from over loading To improve the power factor To reduce the sparks in contacts

Correct Answer: To reduce the sparks in contacts

4) What is the effect, if some slots in a split phase motor left out without winding after completion of concentric winding

Works normally Reduction in speed Reduction in torque Runs with very high speed

Correct Answer: Works normally

5) How the radio interference can be suppressed in centrifugal switch method of speed control of universal motor?

By connecting capacitor across centrifugal switch By connecting capacitor in series with centrifugal switch By adding compensating winding with armature By connecting an inductor in series with centrifugal switch

Correct Answer: By connecting capacitor across centrifugal switch

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