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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 480 V.
 400 V.
 420 V.
 350 V.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  2.
 6.
  8.
 4.

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 parallel with armature
 series with main poles
 series with armature
 parallel with main poles

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Electrical Machines
Which of the following alternators contain large number of poles?

 Hydro alternators.
 Aame in both alternators.
 Turbo alternators.
None of these

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

 demagnetisation.
  cross-magnetisation.
  cross-magnetization as well as demagnetization.
  none of above.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC compound motor.
 Separately excited DC motor.
 DC series motor.
 DC Shunt motor.

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