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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 Cos (α/2)
 sin (α/2)
 Cos α²

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Electrical Machines
The slip of an induction motor normally does not depend on

  core loss component.
  shaft torque.
  synchronous speed.
  rotor speed.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 Decrease.d
 remains same.
 none of these.
 increase.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 Synchronous motor.
 Induction motor.
 AC single phase motor.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 closed winding
 lap winding
 open type winding
 wave winding

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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°.
 24°.
  10°.
 45°.

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