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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 50
 1
 100

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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

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

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 OC and SC tests
 back to back test
 load test
None of these

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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
The power developed by salient pole synchronous machine is/are

None of these
 power due to saliency or reluctance only
 both 1 and 2
 excitation power only

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1/S
 2-S
 S
 1-S

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