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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Ns
 Nr
 Zero

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1500 rpm
 3000 rpm
 4000 rpm
 1000 rpm

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Electrical Machines
Dynamic braking is employed to brake

None of these
 both 1 and 2
 reversing drive
 non reversing drive

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

All of these
 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of main winding.
 reversing the terminals of starting winding.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

 6.
  4.
  data provided is insufficient.
  2.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 45°.
  75°.
 30°.
 0°.

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MORE MCQ ON Electrical Machines

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