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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  aluminium.
  phosphor bronze.
  stainless steel.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 unity power factor.
 any of the above.
 leading power factor.
 lagging power factor.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 660
 600
 40
 60

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 start haunting.
 run at very high speed.
 burn.
 run at very low speed.

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Electrical Machines
Damper winding is used to

 decrease the load current.
 suppress the hunting.
 both 1 and 2.
 increase the load current.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

 1.5 %.
  less than 1 %.
 4 %.
  zero.

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MORE MCQ ON Electrical Machines

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