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Electrical Machines

Electrical Machines
Stepper motor is used in

 traction
 computer printers
 food processing
All of these

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ f/φ
 E ∝ φf
 E ∝ φ/f
 E ∝ 1/(φf)

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Electrical Machines
Which of the following statements is/are correct ?

None of these
 Compensating winding will act under the pole.
 Both A and B.
 Inter pole winding will act in interpolar region.

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 rheostatic control.
 any of above method.
 Ward Leonard control.
 none of above.

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Electrical Machines
In electric locomotive which of the following motor are used ?

  DC series motor.
  Separately compound motor.
  Shunt motor.
  Synchronous motor.

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Electrical Machines
Which type motors are preferred for lathes?

 DC shunt motors.
 Either A or B.
 Synchronous motor.
 Squirrel Cage induction motor.

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