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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

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

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 increase by 5 %.
 depend on other factors.
 reduce by 5 %.
 remain unchanged.

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Capacitor type induction motors.
  AC slip ring IM.
  Reluctance motor.
  DC series motor.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 2.
  8.
 1.
 4.

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

None of these
  increases the hysteresis loss.
  reduces the saturation magnetization.
  increases the electrical resistivity of iron.

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

 Shaded pole motor.
  PSC (permanent split capacitor) motor.
None of these
 Split phase motor.

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