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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  get over heated.
  run normally.
  make noise.

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Electrical Machines
For larger units high torque it is preferred to use

 Partial motor.
 Slip induction motor.
 DC shunt motor.
 Universal 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
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 none of above.
 rheostatic control.
 Ward Leonard control.
 any of above method.

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Electrical Machines
In DC generator, armature reaction refers to what?

None of these
 Effect of armature flux on the load.
  Effect of armature flux on the main field flux.
 Effect of field flux on the armature flux.

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Electrical Machines
In an auto-transformer, power is transferred through

None of these
 conduction process only.
 induction process only.
 both A and B.

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MORE MCQ ON Electrical Machines

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