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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 30°
 10°
 60°

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and low voltage
 high current and high voltage
 low current and high voltage
 low current and low voltage

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 burn.
 start haunting.
 run at very high speed.
 run at very low speed.

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Electrical Machines
If a DC motor is connected across the AC supply it will

 Run at normal speed.
 Run at lower speed.
  Burn.
 Not run.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 torque.
 current.
 power.
 speed.

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

  Series.
 Differentical compound.
 Cummulative compound.
 Shunt.

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