Home / Mechanical Engineering / Hydraulics and Fluid Mechanics :: section-5

Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. A double overhung Pelton wheel has

  2. A.

     Two jets

    B.

     Two runners

    C.

     Four jets

    D.

     Four runners

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by

  4. A.

     l/d² = (l₁/d₁²) + (l₂/d₂²) + (l₃/d₃²)

    B.

     l/d³ = (l₁/d₁³) + (l₂/d₂³) + (l₃/d₃³)

    C.

     l/d⁴ = (l₁/d₁⁴) + (l₂/d₂⁴) + (l₃/d₃⁴)

    D.

     l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵)

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. The normal stress is same in all directions at a point in a fluid

  6. A.

     Only when the fluid is frictionless

    B.

     Only when the fluid is incompressible and has zero viscosity

    C.

     When there is no motion of one fluid layer relative to an adjacent layer

    D.

     Irrespective of the motion of one fluid layer relative to an adjacent layer

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. Air vessels in reciprocating pump are used to

  8. A.

     Smoothen flow

    B.

     Reduce acceleration to minimum

    C.

     Increase pump efficiency

    D.

     Save pump from cavitations

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. The optimum value of vane exit angle for a centrifugal pump impeller is

  10. A.

     10-15°

    B.

     20-25°

    C.

     30-40°

    D.

     50-60°

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. The specific speed (Ns) of a centrifugal pump is given by

  12. A.

     (N√Q)/H2/3

    B.

     (N√Q)/H3/4

    C.

     (N√Q)/H

    D.

     (N√Q)/H5/4

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. In an outward flow reaction turbine

  14. A.

     The water flows parallel to the axis of the wheel

    B.

     The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel

    C.

     The water enters the wheel at the outer periphery and then flows towards the centre of the wheel

    D.

     The flow of water is partly radial and partly axial

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. In an inward flow reaction turbine

  16. A.

     The water flows parallel to the axis of the wheel

    B.

     The water enters at the center of the wheel and then flows towards the outer periphery of the wheel

    C.

     The water enters the wheel at the outer periphery and then flows towards the center of the wheel

    D.

     The flow of water is partly radial and partly axial

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water , the horse power required will be

  18. A.

     Same

    B.

     0.75 B.H.P

    C.

     B.H.P./0.75

    D.

     1.5 B.H.P

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

  20. A.

     [2(Vr - v) v]/ Vr²

    B.

     [2(Vr + v) v]/ Vr²

    C.

     [(Vr - v) v]/ Vr

    D.

     [(Vr + v) v]/ Vr

    View Answer

    Workspace

    Discuss Discuss in Forum