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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 28 W.
 36 W.
 25 W.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 greater than
 less than
 any of the above

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

  2 KW.
 0.
 10 KW.
 8 KW.

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Electrical Machines
In DC machine yoke offers

 both A and B
 mechanical protection to the machine
 flux path completion
 produce working flux

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Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
 cooling.
 lubrication.
  insulating.

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

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

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