Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum voltage.
 field winding will burn.
 machine will generate maximum power.
 the voltage generated will be zero.

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Electrical Machines
With the increase in speed of DC motor

 Both back emf as well as line current fall.
 Both back emf as well as line current increase.
 Back emf falls and line current increase.
  Back emf increase but line current falls.

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