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Electrical Machines

Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
 Copper loss
 Rotational loss
All of these

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 none of these.
 increase.
 remains same.
 Decrease.d

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 50 W
 75 W
 168.75 W
 112.5 W

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Electrical Machines
Which of the following motors is/are widely used?

 slip ring induction motor
 squirrel cage induction motor
 either of these
None of these

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of poles.
  number of commutator segments.
  number of pole pairs.
  number of parallel paths.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 normal speed.
 less than normal speed.
 zero.
 more than normal speed.

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