SYNCHRONOUS MOTOR AND MG SET - Practice Mode

1) What is the purpose of damper winding in a synchronous motor at starting?

Produce high voltage to initiate the rotation Produce high current to start rotate the motor Produces torque and runs near in synchronous speed Produce a high magnetic-field to maintain a constant speed

Correct Answer: Produce a high magnetic-field to maintain a constant speed

2) Why the synchronous motor fails to run at synchronous speed?

Insufficient excitation Defective pony motor Open in damper winding Short in damper

Correct Answer: Insufficient excitation

3) How the synchronous motor is used as a synchronous condenser?

Varying the motor load Varying the rotor excitation Varying stator voltage in motor Varying stator current in motor

Correct Answer: Varying the rotor excitation

4) What is the function of damper windings in synchronous motor?

Maintain power factor Excite the field winding Maintain constant speed Start the synchronous motor

Correct Answer: Start the synchronous motor

5) Which converter is having high efficienc

SCR converter Rotary converter Motor generator set Mercury arc rectifier

Correct Answer: SCR converter

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