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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum power.
 maximum voltage.
 maximum current.
 no voltage.

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

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

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

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

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Electrical Machines
The use of higher flux density in the transformer design

 reduces the weigh per KVA
 increases the weigh per KVA
 has no relation with the weight of transformer
None of these

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 rate of change of flux is minimum.
 shaft rotation is high.
  rate of change of flux is maximum.
 induced voltage is high.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

None of these
 field weakening method
 same in both methods
 armature resistance control

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