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1) Small pressure differences in liquids is measured using a/an__________________? a. U-tube manometer b. Inclined tube manometer c. Pitot tube d. None of these
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2) Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively) ? a. FL-2T, ML-1T-1 b. FLT, ML-1T-1 c. ML-1T-3, F-1L2T d. F-1L2T-1, MLT-3
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3) Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ? a. Head & discharge b. Length & discharge c. Length & diameter d. Friction factor & diameter
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4) The head loss due to sudden expansion is__________________? a. (V12 – V22)/2gc b. (V1 – V2)2/2gc c. (V1 – V2)/2gc d. (V12 – V22)/gc
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5) The discharge through a Venturimeter depends upon _________________?
a. Pressure drop only b. Its orientation c. Co-efficient of contraction only d. None of these
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6) The ratio of the wall drag to the form drag in the Stoke’s law range (for motion of spherical particles in a stationary fluid) is__________________? a. 0.5 b. 1 c. 2 d. 0.33
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7) Pick out the wrong statement pertaining to fluid flow ? a. The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5 b. The Newtonian fluid velocity in a circular pipe flow is maximum at the centre of the pipe c. Navier-Stokes equation is applicable to the analysis of viscous flows d. Hagen-Poiseuille equation is applicable to the laminar flow of Newtonian fluids
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8) Priming of a centrifugal pump is done to___________________? a. Increase the mass flow rate of fluid b. Develop effective pressure rise by the pump c. Avoid chances of separation inside the impeller d. None of these
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9) The fluid property which matters for falling rain drops to acquire spherical shape is its__________________? a. Pressure b. Height of descend c. Viscosity d. Surface tension
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10) Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an________________? a. Weir b. Hot wire anemometer c. Cup and vane anemometer d. None of these
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11) A centrifugal pump loses prime after starting. The reason of this trouble may be_____________________? a. Incomplete priming b. Too high a suction lift c. Low available NPSH and air leaks in the suction pipe d. All A., B., and C.
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12) The kinetic energy correction factor for velocity distribution of laminar flow is_________________? a. 0.5 b. 1.66 c. 1 d. 2
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13) The co-efficient of drag and lift for an incompressible fluid depends on the_________________? a. Reynolds number b. Froude number c. Mach number d. All A., B. and C.
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14) 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
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15) 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. Powder & granular solids c. Powder & granular solids d. All A, B & C
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16) Volume of liquid displaced by a floating body is equivalent to its_________________? a. Own weight b. Submerged weight c. Own volume d. Submerged volume
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17) 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
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18) What causes cavitation in centrifugal pump ? a. High suction pressure b. Low barometric pressure c. Low suction pressure d. High suction velocity
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19) 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
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20) Pitot tube measures the ______________ of a fluid? a. Pressure b. Average velocity c. Average flow rate d. Point velocity
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21) Manometers measure the ______________ pressure? a. Vacuum as well as the atmospheric b. Difference in c. Absolute d. Gage
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22) Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid________________? a. Lies above the centroid of the plane surface b. Is independent of the specific weight of the fluid c. Is different for different fluids d. Is at the centroid of the plane surface
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23) Vena-contracta pressure tapping is at a distance _______________ from the position of an orificemeter fitted in a pipe of internal diameter ‘d’ ? a. d b. 0.5 d c. 2d d. 4d
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24) A special type of liquid transporting device is the diffuser pump, in which _____________ are minimised? a. Bearing losses b. Disk friction c. Shock losses d. Cavitation
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25) For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by _________________? a. √(2gh) b. C.V. √(2gh) c. Cd √(2gh) d. Cc √(2gh)
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26) Specific speed of a centrifugal pump relates it with another pump having the___________________? a. Dynamic similarity b. Same efficiency c. Same speed d. Geometrical similarity
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27) Isotropic turbulence occurs __________________? a. Where there is no velocity gradient b. At higher temperatures c. Only in Newtonian fluids d. None of these
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28) A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation ? a. Inertial and drag forces are important b. Drag, gravitational and buoyancy forces are important c. Drag force and gravitational forces are important d. None of the above
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29) Which of the following is the „Blasius equation‟, relating friction factor to the Reynolds number ? a. f = 0.079.NRe-0.25 b. f-0.5 = 4.07 loge (NRef)-0.6 c. Both ‘a’ and ‘b’ d. None of these
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30) In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ? a. Rotational b. Unsteady c. Turbulent d. Non-uniform
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31) Draining of shallow pits or sump is done by a sump pump, which is a ______________ pump? a. Single stage vertical b. Centrifugal c. Plunger d. Diffuser
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32) Each term of the Bernoulli’s equation written in the form, (p/ρ) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit ________________? a. Mass b. Volume c. Specific weight d. None of these
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33) What causes convective acceleration in fluid flow ? a. Steep slope in flow b. Unsteady nature of flow c. Non-uniformity of flow d. Turbulence in flow
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34) A streamline is_________________? a. The line connecting the mid-points of flow cross-sections b. Defined for uniform flow only c. Drawn normal to the velocity vector at every point d. Always the path of a particle
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35) With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the____________________? a. Velocity increases b. Pressure decreases c. Both A. & B. d. Neither A. nor B.
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36) Deformation drag, which is caused by widespread deformation of fluid around the immersed body____________________? a. Occurs when NRe is very small b. Is primarily a friction drag c. Is independent of body length d. Depends mainly on cross-sectional shape
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37) The pump impeller and the turbine runner in a hydraulic torque converter___________________? a. Have the same diameter b. Have different diameters c. Are directly coupled d. None of these
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38) Which of the following is a dimensionless parameter ? a. Angular velocity b. Specific weight c. Kinematic viscosity d. None of these
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39) When the pipe Reynold’s number is 6000, the flow is generally___________________? a. Viscous b. Laminar c. Turbulent d. Transition
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40) Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the _______________ decreases? a. NPSH required b. BHP required by the pump c. Head of the liquid pumped d. All A., B. and C.
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