Electrical Machines
Field weakening method is also called as-----------?

 constant current control
 constant torque control
 constant power control
 constant voltage control

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Electrical Machines
With the increase in speed of a DC motor

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

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