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Electrical Machines

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

  lagging.
 unity.
 leading.
 zero.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

All of these
  heating of rotor.
  double frequency currents in the rotor.
  vibrations.

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Electrical Machines
Resistance commutation is used generally in case of

 DC machines above 10 kW.
 DC machines bellow 5 kW.
None of these
  fractional kW DC machines.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 100 ohm
 0.2 ohm
 2 ohm.
 10 ohm

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 MMf method
 ZPF method
 American standard association method
 Synchronous impedance method

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Electrical Machines
Air core transformer as compared to iron core transformer, has

  more copper loss.
 less magnetic core loss.
 more magnetic core loss.
  no magnetic core loss.

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