ELECTRICAL MACHINES QUIZ

  1 at 90°C.

 0.5 at 90°C.

 2 at 90°C.

 3 at 90°C.

None of these

 Split phase motor.

  PSC (permanent split capacitor) motor.

 Shaded pole motor.

  both (B) and (C).

 to counteract the reactance voltage and the cross-magnetizi

 to counteract demagnetizing effect of armature mmf in commutating zone.

  to make commutation spark less.

 over load.

 all of these.

 high filed circuit resistance.

 zero or very low voltage supply.

 2%

 4%

 25%

 5%

 limit the armature current.

 demagnetize the field partially.

 control the field flux.

 control the armature flux.

All of these

 They are self lubricating in nature

 In case of any sparking they will be less damaged than copper brushes

 They are not hard as copper brush

 Starter.

 Carbone brush.

 Pole.

 Armature.

 4.8% and -3.2%

 6% and -4%

None of these

 3.2% and -1.6%

 90°

 70° to 85°

 0°

 25° to 30°