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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V²
 f²
 f
 V

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Electrical Machines
Speed of DC motor can be controlled by varying

 its flux oer pole.
 resistance of armature culture.
 all of these.
 applied voltage.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 damping torque.
 synchronizing power co efficient.
  restoring torque.
 mechanical rotatory system.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Separately Excited DC Motor
 DC Series Motor
 DC Shunt Motor
 Compound Wound DC Motor

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Decreases.
 Remain unchanged
 Increases.
 None of above.

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Electrical Machines
Voltage regulation can be determined by which of the following?

 Synchronous impedance method.
 ZPF method.
All of these
 MMf method.

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MORE MCQ ON Electrical Machines

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