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Electrical Machines

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 zero.
 leading.
  lagging.
 unity.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 30 V.
 40 V.
 60 V.
 90 V.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a dc machine.
 rotor of a dc machine.
 stator of a induction machine.
 rotor of an synchronous machine.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Zero power factor.
 Unity power factor.
 Lagging power factor.
  Leading power factor.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the inductor.
 to reduce the mass.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V2
 f
 f2
 V

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