Electrical drives and control IAT 2

In a split phase motor, the running winding should have

• High resistance and low inductance

• High resistance and High inductance

• Low resistance and high inductance

• Low resistance and Low inductance

In capacitor start single phase motor

• 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

In in capacitor start and run motor the function of the the running capacitor in series with axillary winding is to

• Improve power factor

• Increase overload capacity

• Reduce fluctuation in torque

• to improve torque

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

• 10 degree

• 30 degree

• 20 degree

• 90 degree

The torque developed by a single-phase motor at starting is

• less than the rated torque

• More than the rated torque

• None of the above

• zero

Which of the following motor will have relatively higher power factor?

• Capacitor start motor

• Shaded pole motor

• Capacitor run motor

• Split phase motor

A centrifugal switch is used to disconnect ‘starting winding when motor has

• Picked up 10% speed

• Picked up 20% speed

• Picked up 5 – 10% speed

• Picked up 50 – 70% speed

If a particular application needs high-speed and high starting torque, then which of the following motor will be preferred?

• Shaded pole motor

• Capacitor start motor

• Capacitor run motor

• Universal Motor

Direction of rotation of a split phase motor can be reversed by reversing the connection of

• Starting winding

• Running winding

• Either 1 or 2

• None of the above

In a capacitor start single-phase motor when capacitor is replaced by a resistance

• Motor will consume less power

• Motor will continue to run in the same direction

• Motor will stop

• None of the above