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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

  DC series.
 DC shunt.
 DC compound.
 Induction motor.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 heavily loaded and underexcited
 lightly loaded and over excited
 lightly loaded and underecited
 heavily loaded and over excited

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Electrical Machines
The field system of an alternator is usually excited

  110 / 220 V AC.
  250 / 250 V DC.
  230 V AC.
  3 - Φ, 50 Hz and 400 V.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Series motor with interpoles.
  Series motor without interpoles.
 Cummulative compound motor with interpoles.
 Shunt motor with interpoles.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Decreasing the field current.
 Increasing the field current.
 Increasing the armature current.
 Increasing the field current.

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 any of the two machines
 none of these
 machine B
 machine A

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