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1) Capacity of a rotary gear pump can be varied by__________________? a. Changing the speed of rotation b. Bleeding air into suction c. Bypassing liquid from the suction or discharge line d. All A., B. and C.
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2) For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of_________________? a. 2 b. <2 c. >2 d. 1/2
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3) The valve used for very remote and accurate control of fluid is a _____________ valve? a. Needle b. Globe c. Gate d. Butterfly
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4) If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor). ? a. Q = Q1 + Q2 + Q3 b. V1 = V2 = V3 c. Q1 = Q2 = Q3 d. f = f1 + f2 + f3
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5) Drag co-efficient CD, in Stoke’s law range is given by________________? a. CD = 16/Re.p b. CD = 24/Re.p c. CD = 18.4/Re.p d. CD = 0.079/Re 0.25.p
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6) Design of the casing of centrifugal pump should be such as to minimise the________________? a. Back flow through impeller b. Loss of kinetic head c. Loss of static head d. None of these
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7) Quicksand is an example of a __________ fluid? a. Bingham plastic b. Dilatant c. Newtonian d. Pseudo plastic
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8) The fluid velocity varies as the cube of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop for ____________ fluid? a. Newtonian b. Pseudo-plastic c. Dilatent d. Bingham plastic
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9) The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec? a. 1.8 b. 12.4 c. 186.2 d. 736.4
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10) Hot wire anemometer is used to measure the_________________? a. Velocity of liquids b. Temperature of liquids c. Velocity of gases d. Pressure of liquids
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11) The pressure intensity is the same in all directions at a point in a fluid________________? a. Only when the fluid is frictionless b. Only when the fluid is at rest having zero velocity c. When there is no motion of one fluid layer relative to an adjacent layer d. Regardless of the motion of one fluid layer relative to an adjacent layer
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12) Hydraulic mean radius for flow through packed bed of spherical particle of size, ‘Dp, with porosity ‘ε’ is________________? a. (Dp/6) (ε/1- ε) b. (Dp/6) (1- ε/ε) c. ⅔Dp (1- ε/ε) d. ⅔Dp (ε/1- ε)
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13) Gradually varying fluid flow is an example of ____________ flow? a. Non-steady uniform b. Non-steady non-uniform c. Steady uniform d. Steady non-uniform
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14) The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) ? a. V2 b. 1/V2 c. 1/V d. V
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15) Prandtl number is a measure of the__________________? a. Heat conduction to viscosity of a fluid b. Cp/Cv of a fluid c. Elastic force to pressure force in the fluid flow d. Inertial force to elastic force in the fluid flow
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16) Potential flow is the flow of______________? a. Compressible fluids with shear b. Compressible fluids with no shear c. Incompressible fluids with shear d. Incompressible fluids with no shear
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17) Weber number is the ratio of inertial force to _____________ force? a. Surface tension b. Gravity c. Viscous d. Elastic
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18) In case of Couette flow, the fluid flow is between two large flat parallel plates with___________________? a. Top plate moving and the bottom plate fixed b. Bottom plate moving and the top plate fixed c. Both the plates fixed d. Both the plates moving
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19) Dimension of kinematic viscosity is_____________________? a. MLT-1 b. L2T-1 c. L2T d. L2T-2
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20) Multistage compressors are used in industry, because they____________________? a. Reduce the cost of compressor b. Reduce the size requirement c. Resemble closely to isothermal compression d. Are easy to control
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21) Hydraulic _____________ works on the principle of Pascal’s law of transmission of fluid pressure? a. Press b. Turbine c. Pump d. Coupling
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22) The discharge through a semi-circular weir varies as (where, H = Head of liquid.) ? a. H b. H2 c. H3/2 d. H1/2
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23) Piezometric head is the sum of the ______________ heads? a. Elevation & kinetic energy b. Elevation & pressure c. Kinetic energy & pressure d. None of these
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24) Which of the following exemplifies a three dimensional fluid flow ? a. Fluid flow at the inlet to a nozzle b. Fluid flow between parallel plates c. Viscous fluid flow between converging plates d. None of these
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25) f = 16/NRe, is valid for__________________? a. Turbulent flow b. Laminar flow through an open channel c. Steady flow d. None of these
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26) Which law is followed by the velocity distribution in the turbulent boundary layer ? a. Parabolic law b. Linear law c. Logarithmic law d. None of these
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27) In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)? a. Vavg b. 1.2 Vavg c. 1.5 Vavg d. 1.8 Vavg
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28) Unsteady non-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 increasing rate d. Expanding tube at constant rate
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29) Slugging occurs in a fluidised bed, if the bed is___________________? a. Narrow b. Deep c. Both A. & B. d. Neither A. nor B.
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30) The curve of metacentre for a floating body ____________ the curve of buoyancy? a. Is always below b. Is the evolute of c. Intersects at right angle d. Is tangential to
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31) What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe) ? a. 0.5 b. 1 c. 1.5 d. 2
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32) Erosion and pits formation on the impeller of a centrifugal pump may be due to________________? a. Cavitation b. Low speed of impeller c. Its operation with delivery valve closed for considerable time after starting the pump d. Off centering of pump with motor
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33) Cavitation occurs in a centrifugal pump when the suction pressure is________________? a. Less than the vapour pressure of the liquid at that temperature b. Greater than the vapour pressure of the liquid at that temperature c. Equal to the vapour pressure d. Equal to the developed head
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34) Propellers are____________________? a. Axial flow mixers b. Low speed impeller c. Used for mixing liquids of high viscosity d. Radial flow mixers
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35) The range of a particular Rotameter can be increased by__________________? a. Use of floats of different densities b. No means c. Increasing the diameter of the float d. Decreasing the diameter of the float
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36) The value of critical Reynolds number for pipe flow is_________________? a. 1,300 b. 10,000 c. 100,000 d. None of these
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37) The contraction co-efficient for Borda’s mouthpiece (for frictionless fluid) is__________________? a. 0.1 b. 0.5 c. 0.94 d. 1
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38) In a stabilised soap bubble, pressure inside it compared to external pressure is________________? a. More b. Less c. Same d. Unpredictable
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39) Volute of a centrifugal pump should be designed in a fashion, such that the________________? a. Kinetic head gets converted into static head b. Moving stream gradually reduces velocity c. Mean velocity remains constant d. None of these
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40) For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively) ? a. G is above B b. B is above G c. B & G coincide d. None of these
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