1) The maximum head that can be developed by a single impeller is _____________ ft? a. 25 b. 100 c. 250-300 d. 1000
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2) 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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3) Path followed by water jet issuing from the bottom of a water tank will be a__________________? a. Parabola (vertex being at the opening) b. Hyperbola c. Horizontal straight line d. Zig-zag path (which is geometrically undefined)
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4) For flow past a flat plate, if „x‟ is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to________________? a. √x b. 1/√x c. x d. 1/x
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5) The unit of bulk modulus of elasticity for a liquid in S.I. unit is____________________? a. N b. N/m c. N/m2 d. N/m3
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6) It is possible to integrate an automatic flow controller to a________________? a. Flow nozzle b. Venturimeter c. Rotameter d. None of these
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7) Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will_______________? a. Increase b. Decrease c. Remain unchanged d. Increase or decrease depending on the pipe material
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8) The dimension of surface tension is________________? a. ML-2 b. MT-2 c. MLT-2 d. ML-2T
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9) N. second/m2 is___________________? a. The S.I. unit of dynamic viscosity b. The S.I. unit of kinematic viscosity c. Equivalent to one poise d. Equivalent to one stoke
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10) Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an ________________? a. Pitot tube b. Venturimeter c. Orificemeter d. Rotameter
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11) Maintenance cost of a ______________ pump for a particular duty is the least? a. Centrifugal b. Reciprocating c. Volute d. Gear
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12) With a constant diameter impeller of a centrifugal pump _____________________? a. Its capacity varies directly as the square of speed b. Head varies as the square of speed c. Horsepower input varies as the square of speed d. Head varies as the speed
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13) Which of the following is an undesirable property of a manometric liquid ? a. Non-sticky & non-corrosive nature b. High vapour pressure c. Low viscosity & surface tension d. Low co-efficient of thermal expansion
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14) In Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the ______________ of its diameter? a. Inverse b. Square root c. Second power d. First power
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15) The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is_________________? a. Q∝N : H∝N2 : P∝N3 b. Q∝N2 : H∝N3 : P∝N c. Q∝N : H∝N3 : P∝N2 d. Q∝N3 : H∝N : P∝N2
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16) A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is_________________? a. 25.61 kPa b. 11.77 kPa c. 14.86 kPa d. 21.13 kPa
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17) Efficiency of power transmission (ε) through a circular pipe is given by (ht – hf)/ht, which has a maximum value of _____________ percent? a. 33:3 b. 50 c. 66.6 d. 88.8
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18) For a reciprocating pump, the indicator diagram is the graph between the________________? a. Discharge and overall efficiency b. Volume swept by piston for one complete revolution and the pressure in the cylinder c. Angle swept by the crank pin at any instant and the discharge d. None of these
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19) Power requirement of fans having constant wheel diameter varies _____________ fan speed? a. As square of b. Directly as c. As cube of d. None of these
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20) Which is not a variable head meter _________________? a. Venturimeter b. Pitot tube c. Rotameter d. None of these
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21) Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of ______________ pressure? a. Small differential b. Atmospheric c. Absolute d. Gage
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22) Creeping flow around a sphere is defined, when particle Reynolds number is___________________? a. < 2100 b. < 0.1 c. > 2.5 d. < 500
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23) During ageing of fluid carrying pipes, the__________________? a. Pipe becomes smoother with use b. Friction factor increases linearly with time c. Absolute roughness decreases with time d. Absolute roughness increases linearly with time
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24) In fluid flow, the stagnation point is defined as a point, where the _____________ is zero? a. Flow velocity b. Pressure c. Total energy d. All A., B. and C.
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25) A hydraulic ram acts as a/an ______________ pump? a. Centrifugal b. Reciprocating c. Impulse d. Parallel cylinder
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26) Viscosity of water is about _____________ times that of air at room temperature? a. 15 b. 55 c. 155 d. 1050
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27) Sewage sludge is an example of the ______________ fluid? a. Bingham plastic b. Newtonian c. Pseudo plastic d. Dilatent
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28) 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
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29) 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
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30) Velocity of liquid hydrocarbon fuels in a pipeline cannot be measured by magnetic flowmeters, because their ______________ is very low/small? a. Thermal conductivity b. Electrical conductivity c. Specific gravity d. Electrical resistivity
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31) 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
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32) 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
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33) 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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34) One dimensional fluid flow implies the ________________________? a. Flow in straight lines only b. Uniform flow c. Steady uniform flow d. Flow in which transverse components are zero
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35) For laminar flow through a closed conduit____________________? a. Vmax = 2Vav b. Vmax = Vav c. Vmax = 1.5Vav d. Vmax = 0.5Vav
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36) Each term in Bernoulli‟s equation represents the _____________ of the fluid? a. Energy per unit mass b. Energy per unit weight c. Force per unit mass d. None of these
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37) For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is________________? a. More b. Less c. Equal d. Independent of porosity
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38) The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides ‘x’ & ‘y’ is given by_________________? a. 2xy/(x + y) b. xy/(x + y) c. (x + y)/2xy d. (x + y)/xy
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39) The nominal size of a hose pipe is specified by its _________________? a. I.D. b. O.D. c. Thickness d. None of these
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40) An equipotential line is _____________ to the velocity vector at every point? a. Normal b. Parallel c. Tangential d. None of these
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