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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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

  the damper bars develop synchronous motor torque.
  negative sequence currents are generated.
  the damper bars develop induction generator torque.
  the damper bars develop induction motor torque.

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