Chemical Fluid Mechanics Practice Online - Set 40 - ObjectiveBooks
Chemical Fluid Mechanics Practice Online - Set 40

Chemical Fluid Mechanics Practice Online - Set 40

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Practice Test: Question Set - 40

1. Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively 

    (A) Efficiency, head and B.H.P.
    (B) Head, efficiency and B.H.P.
    (C) B.H.P., efficiency and head
    (D) Efficiency, B.H.P. and head
2. The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its
    (A) Absolute viscosity
    (B) Ratio of absolute viscosity to density
    (C) Density
    (D) Reynolds number
3. If in a flow field, between any two points, then the flow must be
    (A) Steady, incompressible, irrotational
    (B) Steady, compressible, irrotational
    (C) Steady, compressible and along a streamline
    (D) Unsteady, incompressible, irrotational
4. Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of
    (A) Powder & granular solids
    (B) Liquids
    (C) Low melting point semi-solids
    (D) All 'a', 'b' & 'c'
5. Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?
    (A) Increasing the impeller speed and the volute area
    (B) Increasing the number of vanes in the impeller
    (C) Mounting of two or more impellers in series on a single shaft
    (D) Either of (a), (b) or (c)
6. Volume of liquid displaced by a floating body is equivalent to its
    (A) Own weight
    (B) Submerged weight
    (C) Own volume
    (D) Submerged volume
7. Working of a __________ pump characterizes mixed flow.
    (A) Turbine
    (B) Piston
    (C) Diaphragm
    (D) None of these
8. What causes cavitation in centrifugal pump?
    (A) High suction pressure
    (B) Low barometric pressure
    (C) Low suction pressure
    (D) High suction velocity
9. Drag co-efficient in hindered settling is __________ that in free settling.
    (A) Less than
    (B) Equal to
    (C) Not necessarily greater than
    (D) Always greater than
10. For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is
    (A) More
    (B) Less
    (C) Equal
    (D) More or less, depending on the type of particle
11. In case of Venturimeter, friction losses are about __________ percent of maximum velocity head.
    (A) 2
    (B) 8
    (C) 12
    (D) 20
12. The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and
    (A) Moving
    (B) Static
    (C) Cold
    (D) Hot
13. The maximum head that can be developed by a single impeller is __________ ft.
    (A) 25
    (B) 100
    (C) 250-300
    (D) 1000
14. Pitot tube measures the __________ of a fluid.
    (A) Pressure
    (B) Average velocity
    (C) Average flow rate
    (D) Point velocity
15. Location of vena-contracta in an orificemeter does not depend upon the
    (A) Type of orifice
    (B) Density, viscosity & compressibility of the fluid
    (C) Ratio of pipe diameter to orifice diameter
    (D) Pipe roughness
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