Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

None of these
  rotor at slip rings.
  starting resistance in the starter.
  stator phases of the motor.

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Electrical Machines
For an ideal transformer the winding should have

 maximum resistance on primary side and least resistance on secondary side
 no ohmic resistance on either side
 minimum resistance on primary side and maximum resistance on secondary side
 equal resistance on primary and secondary side

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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 a value greater than 1.25 times 220 V
 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

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