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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
 20.
  0.905.
  0.05.

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

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

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Electrical Machines
The induction motor shaft is made of

  stainless steel.
  mild steel.
  cast iron.
  aluminium.

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Electrical Machines
Which of the following motor is used in grinders?

  Capacitor start IM.
  Synchronous motor.
  Capacitor start capacitor run IM.
  Split phase IM.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  negative sequence current.
  all of these.
  less heating of the rotor.
  less heating of the rotor.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 192 V
 384 V
 768 V
 96 V

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