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Electrical Machines

Electrical Machines
Maximum power developed depends on

 reactance
 both 1and 2
 load angle
 voltage

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I/2 and P/2
 V/2, I and P/2
 V, I and P
 V/2, I/2 and P/4

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
  Effect of armature flux on the main field flux.
 Effect of field flux on the armature flux.
None of these

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Armature voltage.
  Field excitaion.
  Armature current.

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Electrical Machines
Secondary winding of an auto transformer is also called

 tertiary winding.
 compensating winding.
 damping winding.
  common winding.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf / 2.
  s2.
  sf.
  f / s.

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