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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°
 60°
 45°
 10°

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Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
 above rated speed
 below rated speed
None of these

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Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
 decrease
None of these
 increase

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

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

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  about 2 V.
  zero.
  220 V.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC series motor.
 DC compound motor.
 Separately excited DC motor.
 DC Shunt motor.

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