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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?

 30°
 45°
 10°
 60°

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 rectangular
 co- sinusoidal
 sinusoidal

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 6
 2
 1
 4

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Electrical Machines
Which of these types of motor is used in elevators?

 DC series motor.
 DC compound motor.
 None of these.
 DC shunt motor.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 non-sinusoidal nature of armature mmf
 magnetic saturation in half of the field pole
 component of armature mmf along field axis

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Electrical Machines
Drop in speed from no load to full load is very high in

 Shunt motor with interpoles.
 Cummulative compound motor with interpoles.
 Series motor with interpoles.
  Series motor without interpoles.

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