Railways Technical Ability Instrument Mechanical Question Bank Instrument Mechanical

  • question_answer The gross head available to a hydraulic power plant is 100 m. The utilized head in the runner of the hydraulic turbine is 72 m. If the hydraulic efficiency of the turbine is 90%, the pipe friction head is estimated to be:

    A) 20 m                

    B) 18 m

    C) 16.2 m             

    D) 1.8 m

    Correct Answer: B

    Solution :

    Frictional head lost, \[{{H}_{L}}={{\eta }_{hyd}}\times H-{{H}_{u}}=0.9\times 100-72=18\,m\]

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