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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  none of these.
  EbIa2.
  EIa.
  EbIa.

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Electrical Machines
Which of the following pairs is/are correct?

All of these
 semi closed slot-----leakage flux is moderate
 open slot----- leakage flux is less
 closed slot----- leakage flux is high

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Capacitor start
 Shaded pole
 Capacitor run
 Resistance split phase

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 45°.
 24°.
  10°.
 30°.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs load current
 Eg vs load current
 Eg vs Ia
 Vt vs Ia

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 less than
 any of the above
 equal to
 greater than

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