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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

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

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 192 V
 384 V
 768 V
 96 V

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Electrical Machines
Dummy coils are used for

 reducing armature reaction.
 increasing efficiency.
 mechanical balancing.
All of these

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Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 shunt motors
 series motors
 both B and C

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Electrical Machines
Damper winding is used to

 both 1 and 2.
 increase the load current.
 suppress the hunting.
 decrease the load current.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 400 V.
 350 V.
 480 V.

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