chemical engineering process equipment and plant design MCQs – Page 14

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering process equipment and plant design Mcqs

261. A pipe is generally made of circular cross-section, because a circular cross-section has the____________________?
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A. Higher structural strength

B. Lowest surface area requirement for a given volume

C. Both A. & B.

D. None of these

262. Pick out the wrong statement pertaining to the design of the distillation column?
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A. idue build up

B. Generally, a skirt clearance of 0.5? to 1.5? is recommended to prevent plugging of the slots by

C. The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

D. If sufficient slot area is not provided, the gas may pass through the skirt clearance

E. None of these

263. With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter___________________?
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A. Increases

B. None of these

C. Remain unaffected

D. Decreases

264. A cylindrical pressure vessel of volume 6 ?m3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________?
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A. 10 mm

B. 8 mm

C. 6 mm

D. 5 mm

265. Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than ______________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop?
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A. 150

B. 50

C. 25

D. 75

266. The ratio of shear stress to shear strain is called ____________________?
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A. Modulus of elasticity

B. Bulk modulus

C. Modulus of rigidity

D. Shear modulus

267. The buckling tendency of compression members is always in the direction of the _____________________?
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A. None of these

B. Axis of the load

C. Least radius of gyration

D. Perpendicular to the axis of the load

268. Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling ?
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A. SO2

B. NH3

C. None of these

D. CO2

269. The practical representative values of HETP for a number of commercial operations lies within a range of ______________ metre?
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A. 0.4-0.9

B. 0.1-0.2

C. 1.2-1.5

D. 0.2-0.5

270. The minimum plate spacing in most of the petroleum refinery distillation columns (of dia > 3 ft) is normally _____________ inches?
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A. 6

B. 18

C. 12

D. 36

271. Baffles may be eliminated for_________________?
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A. Low viscosity liquids (< 200 poise)

B. None of these

C. Large diameter tanks

D. High viscosity liquids (> 600 poise)

272. For high pressure process equipments/vessels, the connected nozzle should be____________________?
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A. Welded

B. Flanged

C. Screwed

D. Brazed

273. The ends of a cylindrical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure ?
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A. Flat plate

B. Torispherical

C. Ellipsoidal

D. Hemispherical

274. Liquid gradient over the tray results due to the___________________?
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A. Large plate spacing

B. Low gas velocity

C. Large reflux ratio

D. Resistance offered to flow of liquids by caps & risers and the flow of gas

275. Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the__________________?
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A. Practical limit reached, due to low heat transfer rate because of inadequate temperature

B. ference

C. Economic limit reached, when the plant cost exceeds the saving of steam

D. Both A. & B.

E. Neither A. nor B.

276. The function of manholes provided in the shell of a distillation column is to __________________?
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A. All A., B. and C.

B. Give access to the individual trays for cleaning, maintenance and installation

C. Guard against foaming & entrainment by dumping antifoaming agent through it

D. Keep a check on the liquid gradient over the plate by direct visual observation

277. In a shell and tube heat exchanger, the tube pitch is defined as the _____________________?
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A. Shortest distance between two adjacent tube holes

B. O.D. of the tube for square pitch

C. None of these

D. Shortest centre to centre distance between adjacent tubes

278. In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon______________________?
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A. Clearance

B. Pitch

C. Baffle spacing

D. None of these

279. A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?
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A. 80

B. 60

C. 95

D. 45

280. The minimum shell thickness for tank ? 15 metres diameter is limited to _______________ mm, for reasons of elastic stability?
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A. 10

B. 15

C. 2

D. 5

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