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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

None of these
 non reversing drive
 reversing drive
 both 1 and 2

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Electrical Machines
From no load to full load the slip will

 slightly decrease.
None of these
 slightly increase.
 not change.

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Electrical Machines
Diverters are used only in

None of these
 shunt motors
 either of these
 series motors

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Electrical Machines
DC generator will not build up voltage

  if it has lost residual magnetism.
 any one of above.
 due to wrong direction of rotation.
 if field resistance is more than critical resistance.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field diverter control.
 Field control.
 Armature voltage control.
 Armature resistance control.

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

 full wave controlled
 half wave controlled
 full wave
 half wave

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