Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  statically induced voltage.
  reactance voltage.
  dynamically induced voltage.
None of these

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Electrical Machines
With the increase in speed of a DC motor

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

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