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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

None of these
 non reversing drive
 reversing drive
 both 1 and 2

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Electrical Machines
Which of the following generators are used in arc welding?

 series generators
 shunt generators
 cumulative compound generators
 differential compound generators

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Star side lags by -30°.
 Delta side leads by 30°.
  Delta side lags by -30°.
 Star side leads by 30°.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

  clearance between tips of the adjacent pole shoes.
  shape of the pole shoe.
  all of above.
 size of air gap.

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Electrical Machines
The slip of an induction motor normally does not depend on

  shaft torque.
  core loss component.
  rotor speed.
  synchronous speed.

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

  It is a constant speed motor.
 It is a step angled motor.
 It is a high reluctance motor.
 It is a variable speed motor.

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