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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 30°.
 60°.
 120°.

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 Synchronous motor.
 Reluctance motor.
 DC shunt motor.

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Electrical Machines
which of the following type of brush and their application is/are correct

 copper graphite → low voltage high current density
 carbon brush → normal ratings
All of these
 electro graphite → large ratings

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 10V
 20V
 100V
 200V

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Reluctance motor.
 Hysteresis motor.
 Shaded pole motor.
  Stepper motor.

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

  In series with the armature winding.
 As a separate unit.
 In parallel with the field winding.
 In parallel with the armature winding.

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