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Electrical Machines

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

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

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Open slots.
  Closed slots.
  None of above.
  Semi closed slots.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  Both (A) and (B).
  By varying the supply frequency.
  By varying supply voltage.
  By varying number of poles.

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Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 armature current(Ia)
 both A and B
 flux(φ)

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Electrical Machines
Commutator in DC generator is used for

 convert AC armature current in to DC
 collecting of current
 increase efficiency
 reduce losses

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 100 V.
 800 V.
 200 V.
 400 V.

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