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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
  insulating.
 lubrication.
 cooling.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 20 ppm.
 25 ppm.
 45 ppm.
  35 ppm.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  delta connection.
  star connection.
  zig - zag connection.
  V connection.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos α²
 Cos α
 sin (α/2)
 Cos (α/2)

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia2
 Ia
 1/Ia
 I/Ia2

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 aprroach infinity.
 remain unchanged.
 between zero and infinity.
 approach zero.

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