chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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
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

344. The Mach number for hypersonic flow of compressible fluid is____________________?
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A. > 4

B. > 1

C. 1

D. < 2

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

346. Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (?0) with age/time (t) (where, ? = roughness of the surface after timet. ? = a co-efficient to be experimentally determined) ?
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A. ? = ?0 + ?.t4

B. ? = ?0 + ?.t

C. ? = ?0 + ?.t3

D. ? = ?0 + ?.t2

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

351. Quicksand is an example of a __________ fluid?
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A. Pseudo plastic

B. Dilatant

C. Newtonian

D. Bingham plastic

352. Bernoullis equation for steady, frictionless, continuous flow states that the ______________ at all sections is same?
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A. Total energy

B. Velocity head

C. Total pressure

D. None of these

353. Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the_______________?
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A. Drag on column walls

B. Drag on particles

C. Bed height

D. Bed voidage

354. 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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A. None of these

B. 4.4 KPa

C. 3.7 KPa

D. 2.94 KPa

355. Which of the following exemplifies a three dimensional fluid flow ?
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A. None of these

B. Fluid flow between parallel plates

C. Fluid flow at the inlet to a nozzle

D. Viscous fluid flow between converging plates

356. The Reynolds number for an ideal fluid flow is _________________?
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A. ?

B. 4000

C. 4

D. 2100-4000

357. Shear stress in a fluid flowing in a round pipe_________________?
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A. Is zero at the wall and increases linearly to the centre

B. Is zero at the centre and varies linearly with the radius

C. Varies parabolically across the cross-section

D. Remains constant over the cross-section

358. The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by_____________________?
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A. Cv . Va

B. Cv . ?(2gH)

C. Cd . ?(2gH)

D. Cc . ?(2gH)

359. The pressure head on sudden contraction in a horizontal pipe is converted into the _____________ head?
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A. Elevation

B. Velocity

C. Both A. & B.

D. Neither A. nor B.

360. In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure ______________ the vapor pressure of the liquid at the suction temperature?
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A. Equal to

B. Lower than

C. Higher than

D. None of these