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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 Cos α
 sin (α/2)
 Cos α²

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Electrical Machines
Open circuit in a transformer is prefered with

 high frequency supply
 rated transformer voltage
 direct current
 rated transformer current

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the armature current.
 None of above.
 Proportional to the square of armature current.
 Inversely proportional to the armature current.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  asynchronous motor.
  repulsion motor.
  shunt motor.
  transformer.

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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 cooling.
  increasing terminal voltage.
  increasing armature resistance.

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Electrical Machines
A generator may loose residual magnetism due to

  heating.
  vibrations.
  any of these.
  over excitation.

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