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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 1-S
 1/(1-S)
 S

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 2 at 90°C.
 3 at 90°C.
 0.5 at 90°C.
  1 at 90°C.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Stepper motor.
  Slip ring induction motor.
  DC differential compound motor.
  Synchronous motor.

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

  wound.
  none of these.
  linear.
  cage.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

 Back emf is equal.
 None of above.
  Back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 any of the above
 0
 1
 0.5

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