logo

CuriousTab

CuriousTab

Discussion

Home ‣ Mechanical Engineering ‣ Hydraulic Machines Comments
  • Question

  • 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

  • Correct Answer
  • 16 to 24 

    • Hydraulic Machines problems

    Search Results

    • 1. 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
    • 2. Power required to drive a centrifugal pump is __________ proportional to N3.

    • Options
    • A. directly
    • B. inversely
      • Discuss
    • 3. The discharge through a reaction turbine __________ with the increase in unit speed.

    • Options
    • A. remains same
    • B. increases
    • C. decreases
      • Discuss
    • 4. A draft tube is used with impulse turbines.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 5. The flow ratio of Francis turbine is defined as the ratio of the

    • Options
    • A. velocity of flow at inlet to the theoretical jet velocity
    • B. theoretical velocity of jet to the velocity of flow at inlet
    • C. velocity of runner at inlet to the velocity of flow at inlet
    • D. none of the above
      • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
      • Discuss
    • 9. The maximum hydraulic efficiency of an impulse turbine is (where ? = Angle of blade tip at outlet)

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

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.