0% 0 Fluid Mechanics for Chemical Quiz 9 1 / 50 Purpose of air lift pump is to______? Lift compressed air Lift water from a well by using compressed air Lift air under negative pressure Compress air 2 / 50 Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg ? 0.01 0.001 1 0.1 3 / 50 Slugging in a fluidised bed can be avoided by using_______? Tall narrow vessel Deep bed of solids Very large particles Shallow beds of solids and proper choice of particle size 4 / 50 Pressure drag does not depend upon the__________? All A., B. and C. Length of the body in flow direction Pressure of main flow only Roughness of surface of the body 5 / 50 Remote control valve is a ________ valve? Needle Butterfly Gate Globe 6 / 50 Pressure drop in packed bed for turbulent flow is given by the _______ equation? Blake-Plummer Leva?s Kozeny-Carman Hagen-Poiseuille?s 7 / 50 Ratio of inertial forces to surface tension forces is called the ______ number? Mach Euler Froude Weber 8 / 50 Reciprocating pumps compared to centrifugal pumps___________? Can be operated with delivery valve closed Are not subject to air binding Deliver liquid at uniform pressure Can handle slurries more efficiently 9 / 50 Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition. ?/?s = 0 ?/?t = constant ?/?s = constant ?/?t = 0 10 / 50 Quicksand is an example of a __________ fluid? Newtonian Bingham plastic Pseudo plastic Dilatant 11 / 50 Priming of a centrifugal pump is done to_____? Develop effective pressure rise by the pump Avoid chances of separation inside the impeller None of these Increase the mass flow rate of fluid 12 / 50 Priming is needed in a _______ pump? Diaphragm Reciprocating Centrifugal Gear 13 / 50 Pressure drop (?p) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as_____? V1.8 V-0.2 V2 V2.7 14 / 50 Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around_________? 1000 2000 100 10 15 / 50 Propeller type centrifugal pumps are most suitable for___________? Low capacity at low heads Low capacity at high heads High capacity at low heads High capacity at high heads 16 / 50 Scale up of agitator design requires_________? Dynamic similarity only All geometrical, dynamic and kinematic similarity Geometrical similarity only Both geometrical and dynamic similarity 17 / 50 Self-priming centrifugal pump can be used for_________? Pumping industrial wastes Booster service All A., B. and C. Pumping liquid fertilisers (e.g. liquid NH3) 18 / 50 Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will________? Data insufficient to predict pressure drop Remain same Decrease Increase 19 / 50 Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have______? Higher capital &maintenance cost High vibrations Very low speeds Smaller discharge 20 / 50 Propellers are______? Axial flow mixers Low speed impeller Used for mixing liquids of high viscosity Radial flow mixers 21 / 50 Rubber latex is an example of _______ fluid? Pseudo plastic Dilatants Bingham plastic Newtonian 22 / 50 Re/NFr is called the ______ number? Galileo Archimedes Brinkman Euler 23 / 50 Pumping of a corrosive liquid is generally preferred to be done by a _______ pump, as it can be made of a variety of materials including plastics? Positive displacement Sump Piston Gear 24 / 50 Steady non-uniform flow is exemplified by flow through a/an_____? Long pipe at constant rate Long pipe at decreasing rate Expanding tube at increasing rate Expanding tube at constant rate 25 / 50 Pressure drop for laminar fluid flow through a circular pipe is given by___________? 16/NRe 32 (?LV/gc D2) (fL?/D) (v2/2gc) 4f (L/D) (v2/2gc) ? 26 / 50 Purpose of relief valve in a reciprocating pump is to_____? Protect the pump against developing excessive pressure Facilitate unidirectional flow of liquid Reduce the discharge pressure Control the rate of discharge 27 / 50 Ratio of pressure and inertia force gives _______ number? Weber Froude Euler Mach 28 / 50 Specific speed for a centrifugal pump is_____? N ?Q/H N ?Q/H3/4 N ?Q/H2/3 N3D5/H1/3 29 / 50 Slurries can be most conveniently pumped by a ________ pump? Screw Centrifugal Reciprocating Gear 30 / 50 Rubber latex is an example of a _______ fluid? Newtonian Pseudo plastic Dilatent Bingham plastic 31 / 50 Sewage sludge is _______ type of non-Newtonian fluid? None of these Bingham plastic Dilatant Pseudo plastic 32 / 50 Specific speed of a centrifugal pump relates it with another pump having the_____? Same efficiency Dynamic similarity Geometrical similarity Same speed 33 / 50 Reynolds number is the ratio of______? Inertial forces to viscous forces Inertial forces to gravity forces Viscous forces to inertial forces Viscous forces to gravity forces 34 / 50 Rise of liquid in a capillary tube is due to__________? Adhesion Neither A. nor B. Both A. & B. Cohesion 35 / 50 Slugging occurs in a fluidised bed, if the bed is_____? Narrow Neither A. nor B. Both A. & B. Deep 36 / 50 Schedule number of a pipe, which is a measure of its wall thickness, is given by _________? 1000 P?/S 100 P?/S 10000 P?/S 1000 S/P? 37 / 50 Speed of sound in an ideal gas depends on its_________? None of these Specific volume Temperature Pressure 38 / 50 Pressure drop in a fluidised bed reactor is _______ that in a similar packed bed reactor? Less than Same as Greater than None of these 39 / 50 Steady flow occurs, when the___________? Rate of the velocity change is constant Conditions do not change with time at any point Conditions change steadily with time Conditions are the same at the adjacent points at any instant 40 / 50 Select the correct practical example of steady non-uniform flow? Steadily decreasing flow through a reducing section Motion of river around bridge piers Steadily increasing flow through a pipe Motion of water around a ship in a lake 41 / 50 Pressure drop in a packed bed for laminar flow is given by the _______ equation? Leva?s Kozeny-Carman Fanning friction factor Blake-Plummer 42 / 50 Select the correct statement? A Venturimeter with a given gage difference discharges at a greater rate, when the flow is vertically downward through it, than when the flow is vertically upward The discharge through a Venturimeter depends upon ?p only and is independent of orientation of the meter For a given pressure difference, the discharge of gas is greater through a Venturimeter, when compressibility is taken into account, than when it is neglected The overall pressure loss is the same in a given pipe line, whether a Venturimeter or a nozzle with the same throat dia is used 43 / 50 Steady uniform flow is represented by flow through a/an _____? None of these Expanding tube at constant rate Long pipe at constant rate Long pipe at decreasing rate 44 / 50 Small pressure differences in liquids is measured using a/an___________? Inclined tube manometer None of these U-tube manometer Pitot tube 45 / 50 Purpose of hydraulic accumulator is to________? Ensure intermittent supply of hydraulic pressure Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc Increase the pressure and store/ accumulate it Accumulate pressure to increase force 46 / 50 Sewage sludge is an example of the _______ fluid? Newtonian Bingham plastic Pseudo plastic Dilatent 47 / 50 Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump? Electromagnetic Gear Reciprocating Plunger 48 / 50 Specific speed of a centrifugal pump depends upon the _______ head? Suction Manometric Delivery None of these 49 / 50 Shear stress in a fluid flowing in a round pipe__________? Varies parabolically across the cross-section Remains constant over the cross-section Is zero at the wall and increases linearly to the centre Is zero at the centre and varies linearly with the radius 50 / 50 Select the wrong statement pertaining to flow of an incompressible fluid through a Venturimeter ? For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the Venturimeter Venturimeter incurs less power loss compared to an equivalent orificemeter Discharge of fluid through a Venturimeter depends upon the gage difference irrespective of the orientation of Venturimeter Venturimeter occupies less space than an orificemeter 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 7 Fluid Mechanics for Chemical Quiz 11Next
