Chemical Engineering Fluid Mechanics Computer Based Test - Set 20 - ObjectiveBooks

Chemical Engineering Fluid Mechanics Computer Based Test - Set 20

Practice Test: Question Set - 20

1. The length of the tube necessary for the boundary layer to reach the center of the tube and for fully developed flow to be established is called the __________ length.
    (A) Equivalent
    (B) Transition
    (C) Prandtl mixing
    (D) None of these

2. Volute of a centrifugal pump should be designed in a fashion, such that the
    (A) Kinetic head gets converted into static head
    (B) Moving stream gradually reduces velocity
    (C) Mean velocity remains constant
    (D) None of these

3. Diaphragm pumps are used to transport
    (A) Solids
    (B) Liquids
    (C) Fluids
    (D) Slurries

4. For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively).
    (A) G is above B
    (B) B is above G
    (C) B & G coincide
    (D) None of these

5. Rubber latex is an example of __________ fluid.
    (A) Dilatants
    (B) Newtonian
    (C) Pseudo plastic
    (D) Bingham plastic

6. Which of the following has the maximum compression ratio?
    (A) Blower
    (B) Compressor
    (C) Vacuum pump
    (D) Fan

7. Discharge from a 24 inch pipe of water at 10 ft/sec will be __________ ft3/sec.
    (A) 7.65
    (B) 32.36
    (C) 48.22
    (D) 125.6

8. A mixed flow centrifugal pump
    (A) Employs such an impeller, through which the flow is a combination of radial & axial flow
    (B) Mixes the two fluids before pumping them
    (C) Pumps the two fluids separately and then mixes them
    (D) Employs impellers in both the radial & axial directions

9. For the same flow rate of a fluid, the pressure drop is the least for
    (A) Venturimeter
    (B) Orificemeter
    (C) Flow-nozzle
    (D) Δp is same for all

10. A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump.
    (A) Sump
    (B) Volute
    (C) Vacuum
    (D) Submerged

11. Momentum correction factor used in fluid flow problems accounts for the
    (A) Change in direction of flow
    (B) Change in total energy
    (C) Change in pressure
    (D) Non uniform direction of velocities at inlet & outlet sections

12. For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, μ = fluid viscosity )
    (A) μ
    (B) 1/μ
    (C) √μ
    (D) 1/√μ

13. Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the
    (A) Wall roughness
    (B) Reynolds number
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

14. Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.
    (A) Piston
    (B) Gear
    (C) Positive displacement
    (D) Sump

15. Minimum porosity for fluidization is
    (A) That corresponding to static bed
    (B) That corresponding to completely fluidized bed
    (C) The porosity of the bed when true fluidization begins
    (D) Less than that of the' static bed

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