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Electrical Machines

Electrical Machines
Eddy current loss will depends on

All of these
 Frequency
 Flux density
 Thickness

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Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC series motor.
 DC compound motor.
 DC shunt motor with armature resistance control.

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 less than core loss.
 zero.
  more than core loss.
 equal to core loss.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 230 V
 65 V
 460 V
 115 V

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Electrical Machines
Sparkless commutation can be achieved by employing

 compensating winding.
  inter poles.
  high resistance carbon brushes.
  any one or more of the above methods.

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Electrical Machines
Transformer oil is used as

 inert medium.
 both A and B.
 an insulator.
 a coolant.

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