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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 both 1 and 2
 non reversing drive
None of these
 reversing drive

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

None of these
 remains same.
 increases.
 decreases.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  1960 Watt.
 1800 Watt.
 1920 Watt.
  980 Watt.

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Electrical Machines
The flux involved in the emf equation of a transformer has

  maximum value.
 rms value.
 total value.
 average value.

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Electrical Machines
Tap changer is generally provided in

 earthing transformer.
 voltage transformer.
  power transformer.
 current transformer.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  starting resistance in the starter.
  rotor at slip rings.
None of these
  stator phases of the motor.

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