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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 DC compound.
  DC series.
 Induction motor.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 69 / 3.
  slip X 59 / 3.
  slip X 50 / 3.
 1.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 not start automatically.
 start automatically without trouble.
 develop very low starting torque.
 get damaged.

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ φ/f
 E ∝ f/φ
 E ∝ 1/(φf)
 E ∝ φf

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

 8.
  4.
 32.
 16.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  60 Hz.
  25 Hz.
  50 Hz.

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MORE MCQ ON Electrical Machines

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