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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 either increase or decrease
 increase
 decrease
None of these

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Electrical Machines
The overall power factor of an on load transformer

 is always lagging.
  depends on the power factor of the load.
 is always unity.
 is always leading.

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Electrical Machines
Which of these types of motor is used in elevators?

 DC series motor.
 DC shunt motor.
 DC compound motor.
 None of these.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 equal to that of second transformer.
  more than that of second transformer.
 none of these.
 less than that of second transformer.

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Electrical Machines
The shaft of induction motor should be

  hollow.
  stiff.
  any of these.
  flexible.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the inductor.
 to reduce the mass.
 to reduce the hysteresis loss.

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