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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  stainless steel.
  carbon.
  aluminium.

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Oscillate around the normal speed.
 Remain unaltered.
 Reduce.
 Increase.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  wound.
  none of these.
  cage.
  linear.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 field current control
All of these
 armature circuit resistance control
 supply voltage control

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

 25 ppm.
 20 ppm.
 45 ppm.
  35 ppm.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 Copper loss
 both 1 and 2
 core loss only
 windage and friction loss

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