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Electrical Machines

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

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

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC series motor.
 DC compound motor.
 DC shunt motor with armature resistance.
 DC shunt motor with field weaking control.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 two.
 six.
 four.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 2
 1
 8

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Electrical Machines
The armature resistance of the dc motor is generally of the range

 50 ohm.
 100 ohm.
  0.5 ohm.
  0.1 ohm.

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 below rated speed.
 above rated speed.
 in both direction.

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MORE MCQ ON Electrical Machines

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