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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 square wave.
 triangular wave.
 sine wave.

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Increase.
  Oscillate around the normal speed.
  Reduce.
  Remain unaltered.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 armature circuit resistance control
 field current control
 supply voltage control
All of these

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.05.
  1.0.
  0.5.

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Electrical Machines
In DC machine yoke offers

 flux path completion
 both A and B
 produce working flux
 mechanical protection to the machine

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

 eddy current loss.
 ohmic loss.
 both eddy current and hysteresis loss.
  hysteresis loss.

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MORE MCQ ON Electrical Machines

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