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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f2.
 f1.5.
 f3.

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

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

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting torque becomes low.
 the motor may run away.
 the starting current will be enormously high.
 the motor may not start.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  either stator winding or rotor winding.
  stator winding.
  rotor winding.
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.
  2 Hz.
 50 Hz.
 10 Hz.

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Electrical Machines
The polarity of a DC generator can be reversed by

 increasing field current.
 reversing field electric current as well as direction of rotation.
 reversing the field current.
 any of above.

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MORE MCQ ON Electrical Machines

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