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Chemical Engineering :: Fluid Mechanics

  1. The distance between metacentre and __________ is called metacentric height.

  2. A.
    water surface
    B.
    centre of gravity
    C.
    centre of buoyancy
    D.
    none of these

  3. Check valve is used for __________ flow.

  4. A.
    very precise control of
    B.
    unidirectional
    C.
    multidirectional
    D.
    none of these

  5. Capacity of a rotary gear pump can be varied by

  6. A.
    changing the speed of rotation.
    B.
    bleeding air into suction.
    C.
    bypassing liquid from the suction or discharge line.
    D.
    all (a), (6) and (c).

  7. For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.

  8. A.
    brings about no further reduction of
    B.
    increases
    C.
    decreases
    D.
    none of these

  9. Power number is the ratio of

  10. A.
    drag stress to inertial stress.
    B.
    inertial stress to drag stress.
    C.
    inertial stress to gravitational stress.
    D.
    gravitational stress to drag stress.

  11. The momentum correction factor for the velocity distribution of laminar flow is

  12. A.
    1.3
    B.
    1.66
    C.
    2.5
    D.
    none of these

  13. For the same flow rate of a fluid, the pressure drop is the least for

  14. A.
    venturimeter
    B.
    orificemeter
    C.
    flow-nozzle
    D.
    Δp is same for all

  15. The valve commonly used in pipes larger than 2" dia is a

  16. A.
    globe valve
    B.
    plug-cock
    C.
    gate valve
    D.
    check valve

  17. Foot valves are provided in the suction line of a centrifugal pump to

  18. A.
    avoid priming, every time we start the pump.
    B.
    remove the contaminant present in the liquid.
    C.
    minimise the fluctuation in discharge.
    D.
    control the liquid discharge.

  19. An ideal fluid is

  20. A.
    frictionless & incompressible.
    B.
    one, which obeys Newton's law of viscosity.
    C.
    highly viscous.
    D.
    none of these.