chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 20

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 Review each marked answer and report any item that may be outdated or unclear.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

381. Which of the following equations applies to the fluid flow through a packed bed for very large Reynolds number ?
0

A. Fanning equation

B. Kozeny-Carman equation

C. Hagen-Poiseuille equation

D. Blake-Plummer equation

382. Power required for mixing Newtonian fluids is a function of the _________________?
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A. None of these

B. Density of fluid, viscosity of fluid & impeller dia only

C. Density & viscosity of fluid only

D. Speed of impeller, diameter of impeller & viscosity

383. A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a ____________ pump?
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A. Submerged

B. Volute

C. Sump

D. Vacuum

384. Dimension of surface tension is (where, F = force, L = length) ?
0

A. F-2. L

B. FL-1

C. F-1. L

D. F.L-2

385. Pressure drop in a packed bed for laminar flow is given by the ______________ equation?
0

A. Fanning friction factor

B. Levas

C. Kozeny-Carman

D. Blake-Plummer

386. In area meter (e.g., Rotameter), with increase in the fluid flow rate, the___________________?
0

A. None of these

B. Pressure drop is almost constant

C. Area through which fluid flows does not vary

D. Pressure drop increases linearly

387. Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter d ?
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A. At d/8 from the wall

B. At the centre

C. At the wall

D. At d/4 from the wall

388. Upto what value of Mach number, a fluid may be considered as incompressible ?
0

A. 10

B. 0.03

C. 0.3

D. 3

389. The discharge through a semi-circular weir varies as (where, H = Head of liquid.) ?
0

A. H2

B. H1/2

C. H3/2

D. H

390. Erosion and pits formation on the impeller of a centrifugal pump may be due to________________?
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A. Low speed of impeller

B. Cavitation

C. Off centering of pump with motor

D. Its operation with delivery valve closed for considerable time after starting the pump

391. Foot valves provided in pumps are ____________ valves?
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A. Pressure reducing

B. Directional control

C. Relief

D. Three/four way

392. Unsteady uniform flow is represented by flow through a/an_________________?
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A. Expanding tube at constant rate

B. Expanding tube at increasing rate

C. Long pipe at constant rate

D. Long pipe at decreasing rate

393. When the pipe Reynolds number is 6000, the flow is generally___________________?
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A. Transition

B. Laminar

C. Viscous

D. Turbulent

394. Isotropic turbulence occurs __________________?
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A. Only in Newtonian fluids

B. At higher temperatures

C. Where there is no velocity gradient

D. None of these

395. Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg ?
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A. 1

B. 0.01

C. 0.001

D. 0.1

396. What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water interface? The balloon is of radius 0.1 m and is filled with air ?
0

A. 0.01 ?gH/8

B. 4?g/3

C. 0.01 ?gH/4

D. 0.04 ?gH/3

397. The ____________ is measured by a piezometric opening?
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A. Dynamic pressure

B. Total pressure

C. Point velocity

D. Static pressure

398. If more than two branches of pipes are to be connected at the same point, then use a/an_________________?
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A. Union

B. None of these

C. Elbow

D. Tee

399. Hydraulic radius is the ratio of ____________________?
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A. Square root of flow area to wetted perimeter

B. Flow area to square of wetted perimeter

C. Wetted perimeter to flow area

D. Flow area to wetted perimeter

400. A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) ?
0

A. 0.1

B. 1

C. 0.01

D. 10

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