Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Synchronous speed
 Slip speed
None of these
 Zero

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Electrical Machines
With the increase in speed of a DC motor

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

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