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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  500 to 720.
  1440 to 2880.
  720 to 920.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 unity
 leading
 lagging
 zero

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 0 V.
 20 V.
 40 V.
 60 V.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce both eddy current and hysteresis loss.
 reduce eddy current loss only.
 increase the permeability.
 reduce hysteresis loss only.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 400 V.
 480 V.
 420 V.
 350 V.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 zero power factor and slip tests.
 open circuit and short circuit tests.
 open circuit and zero power factor tests.
 short circuit and slip tests.

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