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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 20KVA
 0KVA
 4KVA

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Electrical Machines
The shaft of induction motor should be

  any of these.
  stiff.
  hollow.
  flexible.

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Electrical Machines
Under commutation results in

  sparking at the middle of the brush.
  no sparking.
  sparking the trailing edge of the brush.
  sparking at the leading edge of the brush.

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Electrical Machines
The armature MMF waveform of a DC machine is

  pulsating.
  rectangular.
  triangular.
  sinusoidal.

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 0 Hz
 50 Hz
 100 Hz

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

 1.4 mWb.
  1.2 mWb.
 3.5 mWb.
 2.7 mWb.

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