Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Differentical compound.
 Cummulative compound.
 Shunt.
  Series.

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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 1.25 times 220 V
 increase to a value greater than 1.25 times 220 V

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Electrical Machines
DC Motor

  dc shunt with armature resistance control.
  dc compound motor.
  dc shunt motor with field weakening.
  dc series motor.

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