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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 any of the above
 full load
 half load
 no load

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Electrical Machines
which of the following type of brush and their application is/are correct

 electro graphite → large ratings
All of these
 copper graphite → low voltage high current density
 carbon brush → normal ratings

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as synchronous reactances Xs
All of these
 directly as Xs2
 inversely as 1/Xs

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 decreases
 remains unaffected
 any of the above
 increases

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Electrical Machines
In alternator, the rotary part is

 armature.
 none of these.
 core.
  magnetic field poles.

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

 16KVA
 20KVA
 0KVA
 4KVA

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