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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 about 115°.
 90°.
  about 75°.
 0°.

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Electrical Machines
Armature of DC machine is made of

 non-ferrous material.
 insulating material.
 silicon steel.
 conducting material.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power slow speed motor.
 Fractional horse power high speed motor.
  Hermetically sealed motor of refrigerator.
 50 MW generator in a power plant.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing any two leads from supply.
  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 rating.
 percentage impedance.
 efficiency.
 leakage reactance.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is equal to internal angle θ.
  input power factor is unity.
  load angle is 45°.
  load angle is 0°.

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MORE MCQ ON Electrical Machines

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