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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 0.9 lag
 unity
 0.2 lag

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 10 ohm
 0.2 ohm
 2 ohm.
 100 ohm

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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

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

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 high filed circuit resistance.
 over load.
 zero or very low voltage supply.
 all of these.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 45°.
  load angle is equal to internal angle θ.
  input power factor is unity.
  load angle is 0°.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 greater than the primary.
 less than primary.
 equal to primary.
 any of the above.

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MORE MCQ ON Electrical Machines

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