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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T ∝ 1/V
 T ∝ 1/V²
 T∝ V²

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 0 .001 %.
 3 %.
  3.33 %.
None of these

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

  0.65 Hz.
 0.70 Hz.
 0.75 Hz.
  60 Hz.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 25° to 30°
 0°
 70° to 85°

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

  Core loss component.
 Shaft torque.
 Rotor speed.
 Synchronous speed.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  flux per pole.
  frequency of waveform.
  number of turns in coil.
All of these

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