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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  zero.
  about 2 V.
  220 V.
  about 50 V.

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

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

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with decrease in the load torque.
 remains constant.
 decreases with increase in the load torque.
 increases with increase in the load torque.

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  none of these.
  modified.
  reversed.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Series motor with interpoles.
 Cummulative compound motor with interpoles.
  Series motor without interpoles.
 Shunt motor with interpoles.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v.
 Blv2.
 Blv.
 Bl2v2.

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MORE MCQ ON Electrical Machines

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