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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 100 Hz
 50 Hz
 0 Hz

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 25 Hz.
 50 Hz.
 Zero Hz.
 100 Hz.

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Electrical Machines
In escalator which motor is used?

  DC shunt motor.
  3 - φ IM.
  1 - φ IM.
  Universal motor.

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Electrical Machines
Hysteresis loop represents the area of

 copper loss
 eddy current loss
 hysteresis loss
 total iron losses

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 both B and C
 over compound generator
 shunt generator

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Four times.
 Doubled.
 Eight times.
 Remains same.

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