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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 no load
 any of the above
 full load
 half load

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 18°
 30°
 20°
 60°

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Electrical Machines
For power factor improvement the synchronous motor is to be

 heavily loaded and underexcited
 lightly loaded and over excited
 lightly loaded and underecited
 heavily loaded and over excited

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Electrical Machines
In which of the following motors DC excitation is not required?

 reluctance motor
 3-phase synchronous generator
 hysteresis motor
 3-phase synchronous 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?

 Increases.
 Remain unchanged
 None of above.
 Decreases.

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Electrical Machines
The slip of an induction motor normally does not depend on

  rotor speed.
  shaft torque.
  core loss component.
  synchronous speed.

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MORE MCQ ON Electrical Machines

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