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Electrical Machines

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
If the excitation is increased, the power factor is

 unity power factor
 leading power factor
 lagging power factor
None of these

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Electrical Machines
In shapers and slotters which motor are preferred?

  Slip ring IM.
  Synchronous motor.
  Squirrel cage IM.
  Double cage motor.

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Electrical Machines
In an ideal DC generator the regulation is

 positive.
 high.
 zero.
 low.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  Can be determined.
 20 Hz.
 35 Hz.
  30 Hz.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high field resistance.
  residual flux.
  high speed.
  magnetic inertia.

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MORE MCQ ON Electrical Machines

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