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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f1.5.
  f.
 f3.
 f2.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Very low.
 Normal.
 Very high.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 full wave controlled
 half wave controlled
 full wave

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Electrical Machines
A DC generator can be considered as

 rotating amplifier.
 power pump.
 rectifier.
 prime mover.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 below rated speed
None of these
 both A and B

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Electrical Machines
Open circuit test on transformer gives

 copper loss
 hysteresis loss
 eddy current loss
 both 1and 2

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