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Electrical Machines

Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 greater than
 any of the above
 less than

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Electrical Machines
Demagnetization effects which of the following?

 both B and C
 reduction in main field flux
 commutation
 reduces the terminal voltage

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f²
 V²
 f
 V

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Electrical Machines
Which of the DC Motor use flywheel?

 Cumulatively compound motor.
 Series motor.
 Shunt motor.
 Differently compared motor.

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Cummulative compound.
 Series.
  Shunt.
 Differential compound.

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Electrical Machines
If the excitation is increased, the power factor is

 lagging power factor
 unity power factor
None of these
 leading power factor

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