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Electrical Machines

Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 6
 4
 1
 2

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 212 V.
 210 V.
  201.02 V.
 205 V.

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Electrical Machines
Commutator in DC generator is used for

 reduce losses
 increase efficiency
 convert AC armature current in to DC
 collecting of current

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very low.
 Zero.
 Normal.
 Very high.

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

 Synchronous speed.
 Rotor speed.
 Shaft torque.
  Core loss component.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

 ohmic loss.
 both eddy current and hysteresis loss.
 eddy current loss.
  hysteresis loss.

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