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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 120°.
 30°.
 60°.

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 50 Hz.
 100 Hz.
 Zero Hz.
 25 Hz.

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 half load
 no load
 any of the above
 full load

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  air gap does not matter.
  as wide as possible.
  as small as possible.
  depends on the material of stator and the rotor.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

  5000 - 45000 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
 decreased.
 kept constant to certain value.
  increased.

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MORE MCQ ON Electrical Machines

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