1) Shear stress in a fluid flowing in a round pipe_________________? a. Varies parabolically across the cross-section b. Remains constant over the cross-section c. Is zero at the centre and varies linearly with the radius d. Is zero at the wall and increases linearly to the centre
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2) Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________? a. d b. 1/d c. ζ d. 1/ζ
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3) Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ? a. Flow rate b. Mean velocity c. Both ‘a’ & ‘b’ d. Neither ‘a’ nor ‘
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4) A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is________________? a. 4.4 KPa b. 2.94 KPa c. 3.7 KPa d. None of these
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5) Which of the following denotes the effect of compressibility in fluid flow ? a. Weber number b. Mach number c. Euler number d. Reynolds number
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6) Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will______________________? a. Increase b. Decrease c. Remain same d. Data insufficient to predict pressure drop
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7) The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is_____________________? a. 0.5 b. 1 c. 1.5 d. 2
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8) Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time’t’. α = a co-efficient to be experimentally determined) ? a. ε = ε0 + α.t b. ε = ε0 + α.t2 c. ε = ε0 + α.t3 d. ε = ε0 + α.t4
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9) ______________ pumps are axial flow pumps? a. Turbine b. Propeller c. Diffuser d. None of these
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10) In a fully turbulent flow (Re > 105) in a pipe of diameter ‘d’, for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is_______________? a. d b. d2 c. d2.5 d. d4
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11) For a particle settling in water at its terminal settling velocity, which of the following is true ? a. Buoyancy = weight + drag b. Weight = buoyancy + drag c. Drag = buoyancy + weight d. Drag = weight
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12) Gear pump_________________? a. Is a positive displacement pump b. Is a centrifugal pump c. Is a non-positive displacement pump d. Can be started with delivery valve closed
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13) Most commonly used joint in the underground pipe lines is the________________? a. Sleeve joint b. Coupling c. Flange d. Expansion joint
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14) Ratio of pressure and inertia force gives ______________ number? a. Weber b. Mach c. Euler d. Froude
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15) With increasing flow rate, the hydraulic efficiency of a centrifugal pump__________________? a. Monotonically decreases b. Decreases and then increases c. Remains constant d. Increases and then decreases
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16) Steady uniform flow is represented by flow through a/an ___________________? a. Long pipe at constant rate b. Long pipe at decreasing rate c. Expanding tube at constant rate d. None of these
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17) Which of the following is not a dimension-less parameter ? a. Euler number b. Specific gravity c. Fanning friction factor d. None of these
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18) A fluid is the one, which___________________? a. Cannot remain at rest under the action of shear force b. Continuously expands till it fills any container c. Is incompressible d. Permanently resists distortion
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19) Brownian movement is prominent in the particle size range of _____________ microns in case of settling of a particle in a fluid? a. 2 to 3 b. 0.01 to 0.10 c. 200 to 300 d. 100 to 1000
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20) The velocity profile for turbulent flow through a closed conduit is_______________? a. Logarithmic b. Parabolic c. Hyperbolic d. Linear
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21) Nominal size of a pipe is an indication of its ______________ diameter? a. Inner b. Outer c. Approximate d. None of these
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22) The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _____________ fluid? a. Bingham b. Newtonian c. Perfect d. None of these
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23) With increase in pump speed, its NPSH requirement_________________? a. Decreases b. Increases c. Remains unaltered d. Can either increase or decrease; depends on other factors
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24) Pressure drag does not depend upon the_________________? a. Roughness of surface of the body b. Pressure of main flow only c. Length of the body in flow direction d. All A., B. and C.
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25) The exit cone angle in case of a standard Venturimeter is _____________ the entrance cone angle? a. Smaller than b. Greater than c. Equal to d. Either A. or B.
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26) Molten soap mass is transported by a ______________ pump? a. Diaphragm b. Reciprocating c. Gear d. Centrifugal
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27) Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will_______________? a. Increase b. Decrease c. Remain same d. Be quadrupled
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28) Dimension of surface tension is (where, F = force, L = length) ? a. FL-1 b. F-1. L c. F.L-2 d. F-2. L
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29) The schedule number of a pipe is an indication of its_________________? a. Size b. Roughness c. Material density d. Wall thickness
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30) A fluid is a substance, that_________________? a. Has to be kept in a closed container b. Is almost incompressible c. Has zero shear stress d. Flows when even a small shear is applied to it
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31) The continuity equation__________________? a. Relates mass flow rate along a stream tube b. Relates work and energy c. Stipulates that Newton’s second law of motion must be satisfied at every point in the fluid d. None of these
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32) The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its__________________? a. Viscosity b. Specific volume c. Velocity d. None of these
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33) In case of supersonic flow of a fluid through pipeline, the ‘Mach number’ is__________________? a. 0 b. 1 c. < 1 d. > 1
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34) Gradually varied flow in open channel is a/an ____________ flow? a. Steady uniform b. Steady non-uniform c. Unsteady uniform d. Unsteady non-uniform
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35) Stoke’s law is valid, when NRe, p is less than_________________? a. 2 b. 100 c. 2100 d. 700
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36) Cavitation in a centrifugal pump can be avoided by keeping the__________________? a. Inlet pressure high b. Outlet pressure low c. Inlet pressure low d. Outlet pressure high
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37) Momentum transfer in laminar flow of fluids results due to the_________________? a. Viscosity b. Density c. Velocity gradient d. None of these
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38) What is the ratio of fluid carrying capacity of two pipes having diameters d1 and d2 respectively ? a. (d1/d2)0.8 b. (d1/d2)0.5 c. d1/d2 d. (d1/d2)2
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39) Mach number is important in a fluid flow problem, when the inertia and _____________ forces predominate? a. Elastic b. Viscous c. Gravity d. None of these
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40) Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.) ? a. √d b. √d c. d4/5 d. d1/3
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