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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 both B and C
 series motors
 shunt motors
 cumulative compound motors

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Electrical Machines
Under commutation results in

  no sparking.
  sparking the trailing edge of the brush.
  sparking at the middle of the brush.
  sparking at the leading edge of the brush.

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

 same.
 changes.
 different.
 none of above.

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

 armature emf.
None of these
  coil resistance.
  reactance voltage induced in the coil.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 full wave controlled
 half wave controlled
 full wave

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

 20KVA
 16KVA
 4KVA
 0KVA

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