Electrical Machines
With the increase in speed of a DC motor

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

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Electrical Machines
A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will

 not change and remain at 220 V
 increase to value lying between 220 V and 1.25 times 220 V
 increase to a value greater than 1.25 times 220 V
 increase to 1.25 times 220 V

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Electrical Machines
In a star - delta starting of an IM

  line voltage is 57.7 % of stator voltage.
  applied voltage per stator phase is 57.7 % of a line volt
  reduced voltage is applied to the stator.
  resistance is inserted in the rotor.

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