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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  speed and voltage.
  voltage.
  load.

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of bushing stud.
 condition of bushings.
 condition of transformer oil.
  condition of transformer.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature voltage control.
 Armature resistance control.
 Any of above.
 Shunt field resistance control.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  Closed slots.
  None of above.
  Open slots.

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Electrical Machines
Which of the DC Motor use flywheel?

 Shunt motor.
 Cumulatively compound motor.
 Differently compared motor.
 Series motor.

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

 1.4 mWb.
 2.7 mWb.
 3.5 mWb.
  1.2 mWb.

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