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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  Z.
  P.
  none of these.
  P and Z.

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

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

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Electrical Machines
Transformer action requires a

 alternating magnetic lux.
 increasing magnetic flux.
 constant magnetic flux.
 alternating electric flux.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
All of these
 minimum
 zero

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  DC motor torque.
  induction generator torque.
  induction motor torque.
  synchronous motor torque.

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Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 Induction motor.
 DC compound.
  DC series.

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MORE MCQ ON Electrical Machines

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