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Electrical Machines

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

 0.9 lag
 unity
 0.2 lag
 0.2 lead

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Cummulative compound.
  Differentical compound.
 Series shunt.
 have an equal number of electrons and protons.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  60 Hz.
  25 Hz.
  16.67 Hz.
  50 Hz.

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Electrical Machines
If the excitation is reduced, the power factor is

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

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 cummulative compound motor.
 AC synchronous motor.
  series motor.
 shunt motor.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  negative sequence current.
  all of these.
  less heating of the rotor.
  less heating of the rotor.

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MORE MCQ ON Electrical Machines

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