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Electrical Machines

Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 15 HP.
 14 HP.
  13 HP.
  10 HP.

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 remains constant.
 increase.
None of these
 decrease.

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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?

 30°.
 45°.
 24°.
  10°.

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Electrical Machines
Slip rings of an induction motors are made of

  aluminium.
  carbon.
  stainless steel.
  phosphor bronze.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.2 lag
 0.9 lag
 0.2 lead

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
 increase.
None of these
 either of these.

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