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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imax.
 Vmin to Imin.
 Vmax to Imin.
 Vmax to Imax.

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  modified.
  none of these.
  increased.
  reversed.

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

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

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Electrical Machines
Poles of DC machine are often laminated to

 reduce iron weight.
 reduce pulsation loss.
 reduce armature reaction.
 dissipate more heat.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

All of these
 field current control
 armature circuit resistance control
 supply voltage control

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
 It will remain the same.
  It will becomes four times.
  It will be halved.

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