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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 25 ppm.
  35 ppm.
 45 ppm.
 20 ppm.

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

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

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Electrical Machines
At slip s = 1 torque developed in machine is

  maximum torque.
  electromagnetic torque.
  none.
  starting torque.

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 induction motor.
 synchronous generator.
 synchronous motor.
  induction generator.

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 increase.
None of these
 decrease.
 remains constant.

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