chemical engineering process equipment and plant design MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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

341. Pick out the wrong statement ?
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A. Plate efficiency increases with increase in superficial vapour velocity till entrainment limit

B. Too small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value

C. Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1"

D. None of these

342. Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscosity above ____________________ poise?
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A. 1000

B. 600

C. 300

D. 1500

343. Seamless pipe is made________________?
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A. From rolled strips formed into cylinders and seam-welded

B. By extrusion & casting into static and centrifugal molds

C. By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer

D. nt and further reducing it by rolling gas drawing

E. Both B. and C.

344. Maximum plate efficiency is achieved in case of ______________ flow?
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A. Reverse

B. Split

C. Cross

D. Cascade

345. Le/D) for 90 elbow (medium radius) and 90square elbow would be respectively around___________________?
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A. 3 and 5

B. 100 and 250

C. 25 and 60

D. 250 and 600

346. The average velocity in the tubes of a 1-4 heat exchanger is ______________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate ?
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A. 2

B. 2-Jan

C. 4

D. 4-Jan

347. A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is________________?
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A. Shear

B. Deformation

C. Bending

D. Elongation

348. What is the slope of the operating line in the rectifying section of a distillation column ?
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A. > 1

B. ?

D. 0

349. The distance between the centres of a rivet hole to the nearest edge of the plate is called _________________?
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A. Pitch

B. Margin

C. None of these

D. Back pitch

350. For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________?
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A. d1/(d1 + d2)

B. d2/(d1 + d2)

C. (d1 + d2)/d2

D. (d1 + d2)/d1

351. A minimum clearance of about _______________ mm is maintained between the distillation column wall and the bubble cap?
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A. 19

B. 95

C. 67

D. 38

352. Pressure differential maintained across a continuous rotary vacuum filter is in the range of _______________ mm Hg column?
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A. 600 to 700

B. 250 to 500

C. 50 to 100

D. 100 to 150

353. Pick out the wrong statement?
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A. The value of crushing load is more than that of buckling load for long columns

B. The tensile strength of a brittle material is less than its compressive strength

C. The compressive strength of a ductile material is less than its tensile strength

D. In a thick cylindrical shell, the hoop stress is maximum at the inner radius

354. Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around _________________?
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A. 50% of the plate spacing

B. 2.5?

C. 0.5?

D. 5?

355. (Le/D) for a Tee (used as elbow, entering branch) would be ____________________?
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A. Less than that for Tee (used as elbow, entering run)

B. More than that for Tee (used as elbow, entering run)

C. Around 90

D. Both B. and C.

356. Pick out the wrong statement pertaining to the design of a basket type evaporator ?
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A. It is used for high viscosity liquor having large rate of scaling

B. Downtake is formed by the annular space between the bundle and the shell

C. There is no central downtake

D. The tube bundle is suspended on bracket

357. Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column ?
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A. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for sieve and valve trays than the bubble cap

B. Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates

C. Maintenance cost for valve and sieve trays are comparatively more than bubble cap tray due to their relatively complicated construction features

D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provide the maximum flexible operating range

358. In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?
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A. 2

B. 20.8

C. ?

D. 1

359. Slope of counter-current flow rotary drier is in the range of ____________ meter/metre?
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A. 0 to 0.8

B. 0 to 1.5

C. 0 to 0.08

D. 0 to 2.2

360. Optimum economic pipe diameter for fluid flow is determined by the____________________?
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A. None of these