Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  unequal to number of rotor slots and skewed in shape.
  either (B) or (C).
  an integral multiple of number of rotor slots.
  equal to number of rotor slots.

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Electrical Machines
Flashing of DC generator means

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

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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

 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
 not change and remain at 220 V

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