Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Armature resistance.
 Residual magnetism of the generator.
 None of above.
 Field resistance.

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Electrical Machines
Flashing of DC generator means

  increasing flux density by providing extra ampere-turns in field.
 neutralization of residual magnetism.
None of these
  creation of residual magnetism by a DC source.

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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 1.25 times 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

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