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  • Question

  • The relation between hydraulic efficiency (?h), mechanical efficiency (?m) and overall efficiency (?o) ) is


  • Options
  • A. ?h = ?o x ?m
  • B. ?m = ?o x ?h
  • C. ?o = ?h x ?m
  • D. none of these

  • Correct Answer
  • ?o = ?h x ?m 

    • Hydraulic Machines problems

    Search Results

    • 1. The force exerted (in newton) by a jetof water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Cross-sectional area of jet in m2, and V = Velocity of jet in m/s)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.

    • Options
    • A. equal to
    • B. 1.2 times
    • C. 1.8 times
    • D. double
      • Discuss
    • 3. In a Francis turbine runner, the number of blades are generally between

    • Options
    • A. 2 to 4
    • B. 4 to 8
    • C. 8 to l6
    • D. 16 to 24
      • Discuss
    • 4. A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Power required to drive a centrifugal pump is __________ proportional to N3.

    • Options
    • A. directly
    • B. inversely
      • Discuss
    • 6. The maximum hydraulic efficiency of an impulse turbine is (where ? = Angle of blade tip at outlet)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. The specific speed of a turbine is given by the equation

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. The hydraulic efficiency of a reaction turbine, is the ratio of

    • Options
    • A. power produced by the turbine to the energy actually supplied by the turbine
    • B. actual work available at the turbine to energy imparted to the wheel
    • C. workdone on the wheel to the energy (or head of water) actually supplied to the turbine
    • D. none of the above
      • Discuss
    • 9. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is

    • Options
    • A. 10 r.p.m.
    • B. 20 r.p.m.
    • C. 40 r.p.m.
    • D. 80 r.p.m.
      • Discuss
    • 10. A Pelton wheel is

    • Options
    • A. tangential flow impulse turbine
    • B. inward flow impulse turbine
    • C. outward flow impulse turbine
    • D. inward flow reaction turbine
      • Discuss

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