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1) One poise (unit of absolute/dynamic viscosity) is equivalent to one_____________________? a. gm/cm2. sec b. gm/cm. sec c. cm2/sec d. m2/sec
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2) Drag is defined as the force exerted by the___________________? a. Fluid on the solid in a direction opposite to flow b. Fluid on the solid in the direction of flow c. Solid on the fluid d. None of these
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3) Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m) ________________? a. N2D3 b. ND2 c. N2D d. N3D5
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4) A relief valve__________________? a. Provides back pressure for a cylinder b. Unloads a pump c. Is a directional control valve d. None of these
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5) Function of air vessel provided in a reciprocating pump is to_________________? a. Reduce discharge fluctuation b. Reduce the danger of cavitation c. Avoid the necessity of priming d. Increase the pump efficiency
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6) Low specific speed of a pump implies that, it is a/an ______________ pump? a. Axial flow b. Centrifugal c. Mixed flow d. None of these
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7) Actual lift of a pump is always less than the theoretical lift and is limited by the__________________________? a. Specific gravity & temperature of the liquid b. Leakage & pressure decreasing at higher elevations c. Frictional resistance through pipes, fittings & passages d. All A., B. and C.
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8) Mach number is the ratio of the speed of the _____________________? a. Fluid to that of the light b. Light to that of the fluid c. Fluid to that of the sound d. Sound to that of the fluid
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9) What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides changes ? a. Rotation b. Translation c. Linear deformation d. Angular deformation
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10) In a fluidised bed reactor___________________? a. Temperature gradients are very high b. Temperature is more or less uniform c. Hot spots are formed d. Segregation of the solids occurs
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11) For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the___________________? a. Square of the radial distance b. Radial distance linearly c. Inverse of the radial distance d. Elevation along vertical direction
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12) For a given fluid flow rate, which of the following incurs maximum head loss ? a. Orificemeter b. Venturimeter c. Flow nozzle d. All of them incur the same head loss
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13) With the increase in depth, the hydrostatic pressure in an un-accelerated incompressible fluid (in a constant gravitational field) ? a. Decreases b. Increases linearly c. Increases exponentially d. Remain constant
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14) Pressure drop for turbulent fluid flow through a circular pipe is given by_________________? a. 64/Re b. 32μLV/gc.D2 c. 4f (L/D) (v2/2gc). ρ d. f (L/D) (v2/2gc). ρ
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15) An isentropic process is the one, in which_________________? a. pv = constant b. pvr= constant c. pvr = constant, and process is reversible d. None of these
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16) A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is___________________? a. 5 b. 14.1 c. 56.22 d. 28.2
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17) The speed of a sound wave in a gas is analogous to the speed of ______________________? a. An elementary wave in an open channel b. Flow in an open channel c. A disturbance travelling upstream in moving fluid d. None of these
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18) Which of the following is used for very accurate measurement of flow of gas at low velocity ? a. Pitot tube b. Rotameter c. Segmental orificemeter d. Hot wire anemometer
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19) Which law/principle of solid mechanics is similar/equivalent to Newton’s law of viscosity in fluid mechanics ? a. Archimedes principle b. Newton’s second law of motion c. Hooke’s law d. Newton’s third law of motion
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20) Pick out the correct statement pertaining to transition/ entrance length in fluid flow ? a. The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is c b. Transition length for laminar flow of Newtonian fluids in a pipe of diameter ‘d’ is equal to 0.05. D.NRe c. Transition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ‘d’ is equal to 50 D d. All A., B. and C.
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21) In a dry packed bed, the pressure drop will be changed by increasing the flow rate as__________________? a. V1.8 b. V-0.8 c. V d. V-1
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22) Toothpaste is a__________________? a. Bingham plastic b. Pseudo-plastic c. Newtonian liquid d. Dilatent
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23) Drag force on the float of a Rotameter is (where Q = flow rate of the)__________________? a. ∝ Q b. ∝ √Q c. ∝ Q2 d. Constant
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24) A piezometer provided in the pipe measures__________________? a. Friction factor b. Static pressure c. Dynamic pressure d. None of these
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25) Which of the following equations is valid for laminar flow of a fluid through packed bed ? a. Fanning equation b. Kozeny – Karman equation c. Hagen-Poiseuille equation d. Blake-Plummer equation
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26) As per Newton’s law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where, μ = fluid viscosity) ? a. 1/μ b. μ c. μ2 d. 1/μ2
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27) Foot valves are provided in the suction line of a centrifugal pump to ____________________? a. Avoid priming, every time we start the pump b. Remove the contaminant present in the liquid c. Minimise the fluctuation in discharge d. Control the liquid discharge
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28) What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ? a. 0.5 b. 1 c. 1.5 d. 2
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29) In case of end to end connection of two or more pipes in series, the ______________ each pipe? a. Same rate of flow passes through b. Head loss is same through c. Rate of flow in each pipe is proportional to the length of d. Total flow rate is the sum of flow rate in
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30) The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is _______________ the mean velocity of flow? a. Directly proportional to b. Directly proportional to square of c. Inversely proportional to d. Inversely proportional to square of
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31) Existence of boundary layer in fluid flow is because of the_________________? a. Surface tension b. Fluid density c. Fluid viscosity d. Gravity forces
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32) The continuity equation of fluid mechanics utilises the principle of conservation of _________________? a. Momentum b. Mass c. Energy d. Both B. & C.
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33) The head loss due to sudden contraction is proportional to___________________? a. Velocity b. Velocity head c. Turbulence d. None of these
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34) Critical velocity in a pipe flow_________________? a. Increases as fluid viscosity increases b. Increases as pipe diameter increases c. Independent of fluid density d. None of these
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35) Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement ? a. f1 = f2 b. f1 < f2 c. f1 > f2 d. Data not sufficient to relate f1 & f2
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36) Choose the set of pressure intensities that are equivalent ? a. 4.33 psi, 10 ft. of water, 8.83 inches of Hg b. 4.33 psi, 10 ft. of water, 20.7 inches of Hg c. 10 psi, 19.7 ft. of water, 23.3 inches of Hg d. 10 psi, 19.7 ft. of water, 5.3 inches of Hg
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37) Velocity head on sudden enlargement in a horizontal pipe is converted into ______________ head? a. Elevation b. Pressure c. Both A. & B. d. Neither A. nor B.
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38) Transition length for turbulent flow in smooth pipe is equal to _____________ times the pipe diameter? a. 0.5 b. 5 c. 50 d. 500
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39) Stoke’s law is valid, when the particle Reynolds number is ______________________? a. < 1 b. > 1 c. < 5 d. None of these
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40) If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is_________________? a. Same in both the tubes b. Greater in 1 mm dia tube c. Greater in 0.5 mm dia tube d. Zero in both the tubes
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