Que.

damper bars in case of sailent old rotors of hydro alternators are usually inserted in pole faces to

  • A. strengthen the excitation current of the poles
  • B. damp the rotor oscillations during transist state owing to sudden change in load conditions
  • C. help improve the power factor of load
  • D. reduce the no load current when load is thrown off

Right Answer is :
✓ B. damp the rotor oscillations during transist state owing to sudden change in load conditions
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