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Electrical Machines

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

 45 ppm.
  35 ppm.
 25 ppm.
 20 ppm.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 36°
 72°
 30°
 18°

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Electrical Machines
The functions of inter poles are

 reduce cross magnetization effect and improve commutation
 nullify reactance voltage and improve the commutation.
 both 1 and 2
None of these

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Electrical Machines
Drop in speed from no load to full load is very high in

 Cummulative compound motor with interpoles.
  Series motor without interpoles.
 Series motor with interpoles.
 Shunt motor with interpoles.

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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
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 3.
 4.
  12.
 7.

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