Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Starting torque, operating speed, full load current.
 Operating speed.
 Starting torque.

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Electrical Machines
With the increase in speed of a DC motor

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

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