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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 V²
 f
 V

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Electrical Machines
Which of the following are variable losses?

 armature copper loss
 eddy current loss
 hysteresis loss
 shunt field copper loss

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

None of these
 either of these
 exactly opposite
 same

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Electrical Machines
A DC generator can be considered as

 rotating amplifier.
 power pump.
 rectifier.
 prime mover.

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  magnetizing current.
  speed.
  air gap flux.
  power factor.

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Electrical Machines
A DC series motor must started on no load because it would

 Fail to start without load.
 Not develop starting torque.
  Run at dangerously high speed.
 Draw more current without producing sufficient torque.

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