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Chemical Engineering :: Fluid Mechanics

  1. What causes convective acceleration in fluid flow ?

  2. A.
    Steep slope in flow
    B.
    Unsteady nature of flow
    C.
    Non-uniformity of flow
    D.
    Turbulence in flow

  3. The Stoke's stream function applies to the

  4. A.
    irrotational flow only.
    B.
    ideal/non-viscous fluids only.
    C.
    cases of axial symmetry.
    D.
    none of these.

  5. Slugging in a fluidised bed can be avoided by using

  6. A.
    tall narrow vessel.
    B.
    deep bed of solids.
    C.
    shallow beds of solids and proper choice of particle size.
    D.
    very large particles.

  7. The ratio of width to depth for the most economical rectangular section in open channel flow is

  8. A.
    0.5
    B.
    1
    C.
    1.5
    D.
    2

  9. The simple pitot tube measures the __________ pressure.

  10. A.
    static
    B.
    dynamic
    C.
    total
    D.
    none of these

  11. Capacity of a hydraulic accumulator is defined in terms of maximum

  12. A.
    amount of energy stored.
    B.
    flow rate through accumulator.
    C.
    rate of falling of ram.
    D.
    volume available in the cylinder.

  13. Three piping networks as shown in the figure are placed horizontally. They are made using identical pipe segments and are subjected to the same pressure drop across them. Assuming no pressure losses at junctions, the flow rates across the three networks are related as Q1 : Q2 : Q3.

  14. A.
    1:3: 2
    B.
    1:2:3
    C.
    1:2:2
    D.
    1:2:2

  15. With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the

  16. A.
    velocity increases
    B.
    pressure decreases
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

  17. Boundary layer separation is characterised by one of the conditions given below, where 'Re' is the Reynolds number for the flow. Select the appropriate conditions.

  18. A.
    Re << 1, accelerating flow
    B.
    Re >> 1, accelerating flow
    C.
    Re << 1, decelerating flow
    D.
    Re >>1, decelerating flow

  19. Manometers measure the __________ pressure.

  20. A.
    vacuum as well as the atmospheric
    B.
    difference in
    C.
    absolute
    D.
    gage