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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

 32.
 16.
  4.
 8.

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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is

 2, 4
 1, 4
 1, 3
 2, 3

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Hysteresis losses
 Friction and windage losses
 Eddy current losses
 All of the them

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

None of these
 an induction generator
 an induction motor
 a synchronous motor

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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?

 212 V.
  201.02 V.
 210 V.
 205 V.

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Electrical Machines
Which of the following motor used in hair dryers?

  Cage induction motor.
  Synchronous motors.
  Split phase IM.
  Shaded pole IM.

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