Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 2 alone
 1 and 2
 1, 2 and 3
 1 and 3

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Electrical Machines
With the increase in speed of a DC motor

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

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