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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 GNA
 either GNA or MNA
None of these

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

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

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 remain unaltered.
 become execessively high.
 increase.
 decrease.

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 3
 1, 2, 3 and 4
 3 only
 1, 2 and 3

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 unity power factor
 lagging power factor
All of these
 leading power factor

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -1 < S < 1
 -2 < S < 2
 0 < S < 1
 0 < S < 2

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