chemical engineering fluid mechanics for chemical chemical engineering Mcqs
302. Which of the following denotes the effect of compressibility in fluid flow ?
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A. Euler number

B. Weber number

C. Mach number

D. Reynolds number

303. Capacity of a rotary gear pump can be varied by__________________?
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A. All A., B. and C.

B. Bypassing liquid from the suction or discharge line

C. Changing the speed of rotation

D. Bleeding air into suction

306. The schedule number of a pipe is an indication of its_________________?
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A. Size

B. Material density

C. Roughness

D. Wall thickness
308. The Prandtl mixing length is_________________?
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A. Zero at the pipe wall and is a universal constant

B. Independent of the shear stress

C. Independent of radial distance from the pipe axis

D. Useful for computing laminar flow problems
312. Potential function is applicable only for __________ flow?
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A. Turbulent

B. Steady

C. None of these

D. Irrotational
313. The pressure intensity is the same in all directions at a point in a fluid________________?
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A. When there is no motion of one fluid layer relative to an adjacent layer

B. Only when the fluid is at rest having zero velocity

C. Regardless of the motion of one fluid layer relative to an adjacent layer

D. Only when the fluid is frictionless

314. The capacity of a centrifugal pump Can be increased by increasing the_________________?
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A. Number of pumps and joining them in series

B. Number of pumps and joining them in parallel

C. Impeller diameter or speed

D. All A., B. and C.
315. The head developed by a centrifugal pump is largely determined by the____________________?
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A. Vapour pressure of the liquid

B. Nature of the liquid being pumped

C. Power of the pump

D. Angle of the vanes and the speed of the tip of the impeller
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

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

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

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

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

341. Which of the following flow measuring devices is an area meter ?
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A. Orificemeter

B. Venturimeter

C. Rotameter

D. Anemometer

342. With increase in pump speed, its NPSH requirement_________________?
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A. Remains unaltered

B. Can either increase or decrease; depends on other factors

C. Increases

D. Decreases

343. The valve commonly used in pipes larger than 2? dia is a______________?
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A. Gate valve

B. Globe valve

C. Plug-cock

D. Check valve

345. Which of the following is not an advantage of fluidisation from transfer operation point of view ?
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A. Lower fluid pumping power requirement

B. Prevention of particle segregation

C. Minimisation of temperature variation

D. Intimate contact of the fluid with all parts of the solid particles

347. In hindered settling, the particles are_________________________?
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A. Not affected by other particles and the wall

B. Placed farther from the wall

C. None of these

D. Near each other
348. An ideal fluid is___________________?
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A. Frictionless & incompressible

B. None of these

C. One, which obeys Newtons law of viscosity

D. Highly viscous

349. The buoyant force acting on a floating body is dependent on the _______________?
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A. Surface tension of the liquid

B. Viscosity of the liquid

C. Weight of the liquid displaced

D. Depth of immersion of the body

350. The head loss in turbulent flow in a pipe varies________________?
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A. Inversely as the square of diameter

B. As velocity

C. As (velocity)2

D. Inversely as the velocity