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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  cage.
  none of these.
  linear.
  wound.

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Electrical Machines
Damper winding is used to

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

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 S
 1/S
 2-S
 1-S

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 directly.
 inversely.
 has no relation.
 none of these.

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Electrical Machines
The three point starter is used for

  Shunt motor as well as compound motors.
  Series motor.
  Shunt, compound and series motor.
  Shunt motor.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 start automatically without trouble.
 not start automatically.
 develop very low starting torque.
 get damaged.

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