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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 2
 -1 < S < 1
 0 < S < 1
 -2 < S < 2

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Electrical Machines
Series generators are used in which of the following applications?

 Air crafts.
 Used as boosters in dc distribution or transmission.
All of these
 Arc welding.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 Cos α²
 sin (α/2)
 Cos α

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Electrical Machines
At slip s = 1 torque developed in machine is

  starting torque.
  maximum torque.
  electromagnetic torque.
  none.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing input power of the prime mover.
  increasing armature resistance.
 increasing armature cooling.
  increasing terminal voltage.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Four times.
 Eight times.
 Remains same.
 Doubled.

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