SYNCHRONOUS MOTOR AND MG SET - Quiz

1) Calculate the voltage regulation in percentage if the load is removed from an alternator, the voltage rises from 480V to 660V?

0.272 0.325 0.375 0.385

2) Why D.C supply is necessary for synchronous motor operation?

Reduce the losses Start the motor initially Run the motor with over load Run the motor at synchronous speed

3) Which acts as both inverter and converter?

Metal rectifier Mercury arc rectifier Semi conductor diode Synchronous converter

4) What is the function of inverter?

Convert A.C to D.C Convert D.C to A.C Smoothening A.C sine wave Convert pulsating DC into pure D.C

5) Which converting device can be over loaded?

Rectifier unit Rotary converter Motor generator set Mercury arc rectifier