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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 0KVA
 16KVA
 4KVA

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  residual flux.
  high field resistance.
  magnetic inertia.
  high speed.

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Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
 Cast iron.
  Fibre.
 Silicon steel.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Both 1and 2
 Terminal voltage is same
 Speed of alternators should be same
 Frequency should be same

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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

  75°.
 0°.
 45°.
 30°.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 changes.
 different.
 none of above.
 same.

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