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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
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 2 to 3.
 1.0.
  1.5 to 2.
 3 to 5.

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Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  stainless steel.
  aluminium.
  carbon.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the load.
 varying the applied voltage.
 changing the field excitation.
 varying the speed.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3%
 -3%
 -3.33%
 +3.33%

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Electrical Machines
Oil is provided in an oil filled transformer for

  insulating.
 lubrication.
  both cooling and insulation.
 cooling.

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