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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
  0.573.
 0.649.
 0.443.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

 increase
 either increase or decrease
None of these
 decrease

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 In parallel with the armature winding.
 In parallel with the field winding.
  In series with the armature winding.
 As a separate unit.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

  same.
 proportionate to MVA rating of transformers.
 inversely proportional to MVA rating of transformers.
 such that actual impedance of all transformers would be same.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing terminal voltage.
  increasing armature resistance.
  increasing input power of the prime mover.
 increasing armature cooling.

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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

 become execessively high.
 remain unaltered.
 increase.
 decrease.

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