Fluid Mechanics for Chemical Quiz 1

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**A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?**

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**A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a _____ pump?**

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**A Bingham fluid of viscosity ? = 10 Pa.s and yield stress, ?0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is_________?**

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**A pipe is defined as ?hydraulically smooth?, if the friction factor__________?**

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**A hydraulic accumulator comprises of___________?**

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**A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is__________?**

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**A fluid is the one, which_____?**

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**A centrifugal pump loses prime after starting. The reason of this trouble may be_______?**

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**A floating/submerged body is always stable, if its centre of gravity_____?**

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**A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is ______ litres?**

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**A fluid (?/?) = 0.01 cm2/sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is ________ cm/sec?**

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**_______ is an example of axial flow impeller?**

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**A fluid whose apparent viscosity increases with shear rate is termed as the ______ fluid?**

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**_____ flow means the flow of incompressible fluid with no shear ?**

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**A fluid is a substance, that__________?**

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**A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke?s law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?**

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**A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the power consumed now will be ______ hp?**

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**______ pump is the most suitable device for discharging a liquid against a pressure of ? 1500 kgf/cm2?**

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**A bed of spherical particles (specific gravity 2.5) of uniform size 1500 ?m is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun?s equation for the above fluid-particle system (in SI units) is given below: ? P/L = 375 ? 103 VOM + 10.94 ? 106 V2 OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?**

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**A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be ________ cms?**

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**A hydraulic ram acts as a/an _______ pump?**

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**A Newtonian liquid (? = density, ? = viscosity) is flowing with velocity ?v? in a tube of diameter ?D?. Let ?p be the pressure drop across the length ?L?. For a laminar flow, ?p is proportional to__________?**

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**A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now__________?**

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**A centrifugal pump is called a turbine pump, if it is having a__________?**

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**A globe valve is the most suitable for applications, in which______?**

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**A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is ______ kg?**

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**_____ is used for measuring the static pressure exerted on the wall by a fluid flowing parallel to the wall in a pipeline?**

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**A piezometer provided in the pipe measures___________?**

29 / 50

**A differential pressure cell is used for_______?**

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**_______ pumps are a group of vacuum pumps ?**

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**A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double_____?**

32 / 50

**A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an ______ fluid?**

33 / 50

**A piezometer opening measures the ______ fluid pressure?**

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**A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is ______ hp?**

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**A mono pump is a __________ pump ?**

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**A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is_________?**

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**______ forces do not act in case of fluid flow ?**

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**A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any ?x?? Assume incompressible one dimensional flow i.e., no gradients in the radial direction ?**

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**A Newtonian fluid is that___________?**

40 / 50

**A gas (density = 1.5 kg/m3, viscosity = 2 ? 10?5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m3and viscosity of 3 ? 10?5kg/m.s flowing at 3 m/s will be_________?**

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**______ forces act on a particle moving through a stationary fluid?**

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**_______ pumps are axial flow pumps?**

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**A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, then the new head will be _______ metres?**

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**A fluid element has a velocity V = -y2. xi + 2yx2 . j. The motion at (x, y) = (1/?2, 1) is__________?**

45 / 50

**A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) ?**

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**A mixed flow centrifugal pump_________?**

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**A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the new discharge will be __________ litres/minute ?**

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**A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is___________?**

49 / 50

**A pitched-blade turbine draws _______ a straight blade turbine?**

50 / 50

**A bed of spherical particles (specific gravity 2.5) of uniform size 1500 ?m is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun?s equation for the above fluid-particle system (in SI units) is given below : ? P/L = 375 ? 103 VOM + 10.94 ? 106 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is__________?**

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