chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 17

Practise multiple-choice questions from chemical engineering fluid mechanics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fluid mechanics for chemical chemical engineering Mcqs
321. The ratio of inertial forces to elastic forces is called the __________ number?
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A. Mach

B. Weber

C. Euler

D. Reynolds

322. The hydrodynamic and thermal boundary layers will merge, when ____________________?
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A. Prandtl number is one

B. Nusselt number tends to infinity

C. Schmidt number tends to infinity

D. Archimedes number is greater than 10000

323. Remote control valve is a _______________ valve?
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A. Globe

B. Butterfly

C. Needle

D. Gate

324. Cavitation can be prevented by________________?
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A. Maintaining suction head lower than the vapour pressure

B. Suitably designing the pump

C. Maintaining suction head = developed head

D. Maintaining the suction head sufficiently greater than the vapour pressure
325. Drag co-efficient CD, in Stokes law range is given by________________?
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A. 5.p

B. CD = 0.079/Re

C. CD = 18.4/Re.p

D. CD = 24/Re.p

E. CD = 16/Re.p

326. Rubber latex is an example of ______________ fluid?
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A. Bingham plastic

B. Pseudo plastic

C. Newtonian

D. Dilatants

327. What is the unit of kinematic viscosity in SI unit ?
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A. N/m2. sec

B. Kg. sec/m

C. M2/sec

D. None of these

328. Volute of a centrifugal pump should be designed in a fashion, such that the________________?
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A. Kinetic head gets converted into static head

B. Moving stream gradually reduces velocity

C. Mean velocity remains constant

D. None of these

329. A stream line is___________________?
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A. A line connecting the mid points of flow cross-section

B. Fixed in space in steady flow

C. Drawn normal to the velocity vector at every point

D. Always the path of particle

330. Froude number is not a factor__________________?
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A. When there is no vortex formation

B. For Reynolds number greater than 300

C. For unbaffled tank

D. None of these

331. 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. 42

B. 84

C. 17

D. 1.8

332. Drag is the force component exerted on an immersed object, ?
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A. Passing the centroid of the body at 60to the direction of motion

B. None of these

C. The component being parallel to the flow direction

D. The component being normal to the flow direction

333. The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) ?
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A. V2

B. V

C. 1/V

D. 1/V2

334. f = 16/NRe, is valid for__________________?
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A. Steady flow

B. Turbulent flow

C. Laminar flow through an open channel

D. None of these
335. The maximum depth from which a centrifugal pump can draw water is________________?
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A. 150 feet

B. 34 feet

C. Dependent on the speed of the pump

D. Dependent on the power of the pump

336. 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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A. 0.5

B. 2

C. 4

D. 1

337. A centrifugal pump is called a turbine pump, if it is having a_________________?
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A. None of these

B. Turbine type impeller

C. Rotating vaned volute

D. Vaned diffusion casing
338. In an incompressible flow of fluid, the fluid ________________?
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A. Density does not change with pressure & temperature

B. Temperature remains constant

C. Compressibility is greater than zero

D. Is frictionless

339. A floating/submerged body is always stable, if its centre of gravity___________________?
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A. Lies above its metacentre

B. And centre of buoyancy coincide

C. Lies below its centre of buoyancy

D. Lies above its centre of buoyancy

340. Bed pressure drop in an air fluidised bed of catalyst particles (?p = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is________________?
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A. 90

B. 60

C. 45

D. 30