Chemical Engineering Fluid Mechanics Interview Questions - Set 44 - ObjectiveBooks
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Chemical Engineering Fluid Mechanics Interview Questions - Set 44

Practice Test: Question Set - 44


1. Choking in case of pipe flow means that a
    (A) Specified mass flow rate cannot be achieved
    (B) Valve is closed in the line
    (C) Restriction in flow cross-section area occurs
    (D) None of these

2. Viscosity of water is about __________ times that of air at room temperature.
    (A) 15
    (B) 55
    (C) 155
    (D) 1050

3. Sewage sludge is an example of the __________ fluid.
    (A) Bingham plastic
    (B) Newtonian
    (C) Pseudo plastic
    (D) Dilatent

4. The ratio of width to depth for the most economical rectangular section in open channel flow is
    (A) 0.5
    (B) 1
    (C) 1.5
    (D) 2

5. The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is
    (A) < 1
    (B) 1
    (C) > 1
    (D) 2

6. The pipe wall thickness is minimum for a pipe of given nominal size having schedule number
    (A) 160
    (B) 120
    (C) 80
    (D) 40

7. High specific speed of a pump implies that, it is a/an __________ pump.
    (A) Centrifugal
    (B) Mixed flow
    (C) Axial flow
    (D) None of these

8. Air vessel provided in a reciprocating pump
    (A) Smoothens the flow by avoiding pulsations
    (B) Increases the volumetric efficiency of the pump
    (C) Saves the pump from the danger of cavitation
    (D) None of these

9. Velocity of liquid hydrocarbon fuels in a pipeline cannot be measured by magnetic flow-meters, because their __________ is very low/small.
    (A) Thermal conductivity
    (B) Electrical conductivity
    (C) Specific gravity
    (D) Electrical resistivity

10. Volute type of casing is provided in a centrifugal pump to
    (A) Convert velocity head to pressure head
    (B) Convert pressure head to velocity head
    (C) Reduce the discharge fluctuation
    (D) Increase the discharge

11. The friction factor is
    (A) Always inversely proportional to the Reynolds number
    (B) Not dimensionless
    (C) Not dependent on the roughness of the pipe
    (D) None of these

12. The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is
    (A) 0.3
    (B) 0.9
    (C) 0.03
    (D) 0.66

13. What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition?
    (A) 0.5
    (B) 0.67
    (C) 1
    (D) 2

14. Net positive suction head (NPSH) of a centrifugal pump must be
    (A) Greater than the vapor pressure of the liquid
    (B) Less than the vapor pressure of the liquid
    (C) Equal to the vapor pressure of the liquid
    (D) Less than barometric pressure

15. Turbine impeller
    (A) Produces only radial current
    (B) Produces only tangential current
    (C) Is effective over wide range of viscosities
    (D) Does not produce tangential current

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