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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 8.
  4.
 32.
 16.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 6.
  2.
 4.
  8.

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

  compensating winding and commutating poles.
 fixing the brush axis inline with the pole axis.
 increasing field excitation.
 shifting the brush axis from GNA to MNA.

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Electrical Machines
The speed regulation of a DC motor is given as

 (NnL − NfL)/NfL.
 NnL − NfL.
 NnL/NfL.
 (NfL − NnL)/NnL.

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Electrical Machines
Select the motor that should not be started on no load?

 Shunt motor.
 Brushless DC motor.
  Series motor.
 Compound motor.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Zero.
 Normal.
 Very low.

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