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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

 16.
 32.
 8.
  4.

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Electrical Machines
The armature MMF waveform of a DC machine is

  triangular.
  rectangular.
  sinusoidal.
  pulsating.

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 infinity.
  unity.
 two.
 zero.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  greater than one.
  less than one.
  very low
  approx to one.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 30 volts.
 10 volts.
 20 volts.
 40 volts.

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 As a separate unit.
  In series with the armature winding.
 In parallel with the armature winding.
 In parallel with the field winding.

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