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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  1.
  0.54.
 0.3.
 0.7.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Field current.
 Armature current.
 Line current.
 None of above.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3%
 -3.33%
 +3.33%
 +3%

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

  40 A.
 44 A.
 400 A.
 440 A.

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Electrical Machines
Hysteresis loss will depends on

 f
 f³
 f²
 f1.6

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  get over heated.
  run normally.
  make noise.

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MORE MCQ ON Electrical Machines

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