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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases.
 decreases
 increases.
 remains constant.

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Electrical Machines
Exciting current of an induction motor is

  lesser than power transformer.
  none of these.
  higher than power transformer.
  equal as power transformer.

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Electrical Machines
From no load to full load the slip will

 slightly decrease.
 not change.
 slightly increase.
None of these

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

  3 Hz.
 10 Hz.
 50 Hz.
  2 Hz.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 100 %.
 Less than 50 %
 Around 90 %
 Any where between 75 % and 90 %.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f²
 f
 V²
 V

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MORE MCQ ON Electrical Machines

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