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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 650 W
 625 W
 700 W

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 none of these.
  Shunt.
 Series.
 Compound (cummolative).

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Electrical Machines
Diverters are used only in

 series motors
 shunt motors
None of these
 either of these

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

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

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards brush axis.
 Saddle shape.
 Triangular and directed towards main pole.
 Peaky in nature.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 wet grinders
 personal computers as cooling fan
 tape recorders

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