ELECTRICAL MACHINES QUIZ

 supply voltage and field current at constant excitation.

  power factor and DC excitation at constant load.

 supply voltage and excitation current at constant load.

 power factor and supply voltage during hunting.

 greater than the primary.

 any of the above.

 equal to primary.

 less than primary.

 1.24.

 0.72.

 0.62.

 0.25.

All of these

 increase the maintenance and repair

 increases the design cost

 increase the iron loss

 power factor of load

 magnitude of load current

 both 1 and 2

None of these

 a coolant.

 inert medium.

 an insulator.

 both A and B.

None of these

 reduce cross magnetization effect and improve commutation

 nullify reactance voltage and improve the commutation.

 both 1 and 2

  more breakdown torque.

  less breakdown torque.

  higher efficiency.

  leading power factor.

 single phase to three phase transformation.

 three phase to single phase transformation.

 three phase to two phase transformation.

 any of the above.

 constant voltage control

 constant power control

 constant torque control

 constant current control