Electrical Machines
Compensating winding are used to rectify the flux density waveform at

None of these
  region under main pole.
 interpole region.
 throughout the air gap.

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Electrical Machines
With the increase in speed of a DC motor

 both back emf as well as line current fall.
 both back emf as well as line current increase.
 back emf increases but line current falls.
 back emf falls and line current increases.

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