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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 no load
 half load
 any of the above
 full load

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Electrical Machines
In DC generator, lap winding is used in

 high voltage and low current applications.
 where constant speed is required.
  high current and low voltage applications.
 where greater load is connected.

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
 steel core.
  winding conductors and steel structures of transformer.
 transformer insulating oil.

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 40%
 5%
 19%
 10%

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Electrical Machines
Slip exists in

  synchronous motor.
  none of above.
  induction motor.
  in both machines.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 more than 6 V
 6 V
 zero
 less than 6 V

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