0% 0 Fluid Mechanics for Chemical Quiz 8 1 / 50 Potential flow is the flow of_______? Compressible fluids with no shear Incompressible fluids with shear Incompressible fluids with no shear Compressible fluids with shear 2 / 50 Pascal law is not applicable for a/an __________ fluid? None of these Static Accelerating frictionless Uniformly moving 3 / 50 Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m) _________? ND2 N2D N2D3 N3D5 4 / 50 Pick out the wrong statement ? Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces In case of unsteady fluid flow, the velocity at any given point does not change with time A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces 5 / 50 Pick out the wrong statement ? Pressure decreases exponentially with elevation in an isothermal atmosphere In a static mass of liquid, the pressure at a point is the same for all liquids Atmospheric pressure = absolute pressure ? gage pressure As per Pascal?s law, the pressure at a point in a static or uniformly moving fluid is equal in all directions 6 / 50 Pressure co-efficient is the ratio of pressure forces to _____ forces? Inertial Viscous Gravity None of these 7 / 50 Pick out the wrong statement? The pressure of the liquid measured by a piezometer tube is the gauge pressure Manometric liquid should have high surface tension The vacuum pressure is always the negative gauge pressure The point at which the resultant pressure on an immersed surface acts, is known as the centre of gravity 8 / 50 Paper pulp is an example of ______ fluid? Newtonian Dilatant Pseudo-plastic Bingham plastic 9 / 50 Pick out the wrong statement pertaining to fluid flow ? The Newtonian fluid velocity in a circular pipe flow is maximum at the centre of the pipe Hagen-Poiseuille equation is applicable to the laminar flow of Newtonian fluids The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5 Navier-Stokes equation is applicable to the analysis of viscous flows 10 / 50 Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)? H 12.6 H 14.6 H 13.6 H 11 / 50 Pick out the wrong statement? The form drag is dependent upon the occurrence of a wake Existence of the boundary layer in fluid flow is because of viscosity of the fluid. The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance An ideal fluid is the one, which has negligible surface tension and obeys the Newton?s law of viscosity 12 / 50 Permanent pressure loss in a well designed Venturimeter is about ______ percent of the venturi differential? 1 50 30 10 13 / 50 Pick out the correct statement? A free vortex occurs, when fluid rotates as a solid In turbulent flow, there are neither cross-currents nor eddies A forced vortex occurs when fluid rotates as a solid about an axis In laminar flow, Newton?s law of viscosity does not apply 14 / 50 One dimensional flow implies__________? A flow which does not account for changes in transverse direction Steady uniform flow Flow in a straight line Unsteady uniform flow 15 / 50 Open channel liquid flow is most conveniently measured by a___________? Hot wire anemometer Notch Segmental orifice Rotameter 16 / 50 Potential flow is characterised by the_____? One in which dissipation of mechanical energy into heat occurs Irrotational and frictional flow Formation of eddies within the stream Irrotational and frictionless flow 17 / 50 Pick out the wrong statement ? A fluid in equilibrium is not free from shear stress The viscosity of a non-Newtonian fluid is a function of temperature only Both B. and C. Momentum transfer in laminar flow results from velocity gradient 18 / 50 Prandtl number is a measure of the___________? Heat conduction to viscosity of a fluid Elastic force to pressure force in the fluid flow Cp/Cv of a fluid Inertial force to elastic force in the fluid flow 19 / 50 Pick out the wrong statement? The eddy viscosity is a function of the type of turbulence involved The eddy viscosity is a fluid property The viscosity of a liquid increases with decrease in temperature The viscosity of gas increases with increase in temperature 20 / 50 Pick out the wrong statement about a streamline ? Streamlines intersect at isolated point of zero velocity and infinite velocity The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity It is always parallel to the main direction of the fluid flow It is a line across which there is no flow and it is equivalent to a rigid boundary 21 / 50 Plunger pumps are used for___________? Viscous mass Slurries None of these Higher pressure 22 / 50 Permanent loss in a Venturimeter is about ___________ percent of the pressure drop in the upstream cone? 70 10 1 40 23 / 50 Pipes having diameter 14 inches or more are designated by their__________? Schedule number Outside diameter None of these Inside diameter 24 / 50 Pascal?s law is valid, only when the fluid is_______? None of these At rest and when the frictionless fluid is in motion Frictionless and at rest At rest 25 / 50 Prandtl mixing length is_____? Zero at the pipe wall None of these A universal constant Applicable to laminar flow problems 26 / 50 Pick out the wrong statement? A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity Laminar flow of viscous liquids is involved in the lubrication of various types of bearings Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes Newton?s law of viscosity is not applicable to the turbulent flow of fluid with linear velocity distribution 27 / 50 Pitot tube measures the _______ of a fluid? Average velocity Point velocity Average flow rate Pressure 28 / 50 Path followed by water jet issuing from the bottom of a water tank will be a___________? Horizontal straight line Zig-zag path (which is geometrically undefined) Hyperbola Parabola (vertex being at the opening) 29 / 50 Pick out the wrong statement about cavitation? Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine blades 30 / 50 Pick out the correct statement pertaining to transition/ entrance length in fluid flow ? 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 called the transition length Transition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ?d? is equal to 50 D Transition length for laminar flow of Newtonian fluids in a pipe of diameter ?d? is equal to 0.05. D.NRe All A., B. and C. 31 / 50 Pick out the correct statement? Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow The property of a randomly packed bed (with raschig rings) is given by the ratio of the total volume to the volume of voids in the bed Mach number in an incompressible fluid is always unity Fanning friction factor is inversely proportional to Reynolds number always 32 / 50 Power number is the ratio of______? Gravitational stress to drag stress Inertial stress to gravitational stress Inertial stress to drag stress Drag stress to inertial stress 33 / 50 Normal depth in open channel flow is the depth of flow in the channel ______? Measured normal to the channel bed Corresponding to uniform flow None of these Corresponding to steady flow 34 / 50 Nominal size of a pipe is an indication of its _______ diameter? Outer None of these Inner Approximate 35 / 50 Pick out the wrong statement? Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer Friction losses in pipe fittings are generally expressed in terms of velocity heads Blowers develop a maximum pressure of 2 atmospheres Fanning friction factor in case of turbulent flow of liquids in pipe depends upon relative roughness & Reynolds number 36 / 50 Potential function is applicable only for __________ flow? Irrotational Steady None of these Turbulent 37 / 50 One horsepower is equal to_________? 550 lbf.ft./hr Both A. and B. 550 kgf.m/second 550 lbf.ft/second 38 / 50 Pick out the correct statement pertaining to the flow through a converging-diverging tube ? The value of Mach number is always unity at the throat Throughout the converging portion of the tube, the density increases in the downstream direction No shock wave develops in the tube when the Mach number at exit is greater than unity None of these 39 / 50 One poise (unit of absolute/dynamic viscosity) is equivalent to one_______? m2/sec cm2/sec gm/cm. sec gm/cm2. sec 40 / 50 Power required for mixing Newtonian fluids is a function of the __________? Density & viscosity of fluid only Speed of impeller, diameter of impeller & viscosity Density of fluid, viscosity of fluid & impeller dia only None of these 41 / 50 Pick out the correct statement pertaining to Venturimeter ? The co-efficient of contraction of a Venturimeter is always unity None of these For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when compressibility is taken into account, than when it is neglected A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward 42 / 50 Pick out the wrong statement? With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion In the equation, T. gc = k. (du/dy)n the value of ?n? for pseudoplastic and Dilatant fluid are 1 respectively The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). ?p 43 / 50 Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss ? Rotameter Venturimeter Flow nozzle Orificemeter 44 / 50 One dimensional fluid flow implies the __________? Flow in which transverse components are zero Flow in straight lines only Uniform flow Steady uniform flow 45 / 50 Power loss in an orificemeter is ______ that in a Venturimeter? Less than Data insufficient, cannot be predicted More than Same as 46 / 50 Piezometric head is the sum of the _______ heads? Elevation & kinetic energy None of these Elevation & pressure Kinetic energy & pressure 47 / 50 Non-colloidal solution is an example of the ________ fluid? Pseudo-plastic Dilatent Newtonian Non-Newtonian 48 / 50 Pick out the correct statement? Thin lubricating oil is an example of a non-Newtonian fluid A Newtonian fluid obeys Newton?s law of cooling Human blood is a Newtonian fluid For a non-Newtonian fluid, a straight line passes through the origin in a plot between shear stress and shear gradient 49 / 50 Power requirement of fans having constant wheel diameter varies ______ fan speed? As cube of As square of None of these Directly as 50 / 50 Nominal size of the discharge pipe of a pump is usually ______ the nominal size of the inlet pipe? Twice Larger than Smaller than Same as Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevFluid Mechanics for Chemical Quiz 6 Fluid Mechanics for Chemical Quiz 9Next
