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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f³
 f²
 f
 f1.6

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high field resistance.
  residual flux.
  high speed.
  magnetic inertia.

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
None of these
 power factor of load
 both 1 and 2

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load speed.
  Full load current.
 None of these.
 Full load torque.

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

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1/S
 1-S
 1/(1-S)

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