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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 40 A.
 440 A.
 400 A.
 44 A.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  disconnecting any one phase.
  transposing any two leads from slip rings.
  transposing any two leads from supply.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  crossmagnetising.
  magnetising.
 demagnetising.
  none of above.

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Electrical Machines
Equalizer rings are used in which of the followings?

 wave winding
 both 1 and 2
None of these
 lap winding

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Electrical Machines
In double cage induction motor, the outer cage offers

  high resistance and high reactance.
  high resistance and low reactance.
  low resistance and low reactance.
  low resistance and high reactance.

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are connected.
  Armature and field both are in series with the load.
 Armature and field both are parallel.
 Armature winding is in series with load.

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