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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

  (3/2)Fmax.
 Fmax.
 3Fmax.
 (1/2)Fmax.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of cogging.
 reduce chance of crawling.
  reduce magnetizing current.
 increase starting torque.

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

 50 Hz
 25 Hz
 0 Hz
 100 Hz

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Universal motors.
  Stepper motors.
  Induction motors.
  Reluctance motors.

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 210 V.
  201.02 V.
 212 V.
 205 V.

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

  4.
 32.
 8.
 16.

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