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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

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

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

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

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

 MNA
None of these
 either GNA or MNA
 GNA

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 230 V.
 220 V.
  222 V.
 225 V.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 decreased.
  increased.
 kept constant to certain value.
 remains same.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Ampere law.
 Fleming's right hand rule.
 Lenz's law.
 Fleming's left hand rule.

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