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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Frequency
All of these
 Thickness
 Flux density

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

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

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Electrical Machines
A DC generator beyond critical resistance will generate

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

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Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 NnL − NfL.
 NnL/NfL.
 (NnL − NfL)/NfL.

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Electrical Machines
Which of the following are variable losses?

 eddy current loss
 hysteresis loss
 armature copper loss
 shunt field copper loss

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Zero power factor.
 Unity power factor.
 Lagging power factor.
  Leading power factor.

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