chemical engineering process equipment and plant design MCQs – Page 16

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 Review each marked answer and report any item that may be outdated or unclear.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

301. The operating pressure drop range in a bag filter is about ______________ mm water gauge?
0

A. 1500-2500

B. 500-1500

C. 50-150

D. 10-May

302. An under-designed steam trap will___________________?
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A. Destroy itself of acceleration wear due to rapid recycling

B. None of these

C. Waste steam

D. Back up condensate and cause water hammer in steam line

303. Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is ___________________?
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A. Same

B. More

C. Less

D. Either A. or B.; depends upon the I.D. of the pipe

304. 25 per cent cut segmental baffle means that the baffle__________________?
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A. Height is 75% of the I.D. of the shell

B. Height is 25% of the I.D. of the shell

C. Spacing is 75% of its height

D. Width is 25% of its height

305. The safe height (h) to diameter D. ratio (i.e., h/d) for liquid/petro fuel storage tank of capacity more than 45 kilolitres is less than _________________?
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A. 3.5

B. 3

C. 1

D. 2

306. _____________ dished head is the strongest of all?
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A. Torispherical

B. Hemispherical

C. Elliptical

D. None of these

307. Lap joints are preferred for plates having thickness _______________ mm?
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A. > 3

B. 10-May

C. < 12.5

D. > 5

308. With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will________________?
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A. Remain unaffected

B. Decrease

C. Increase or decrease depending on the nature of the dust

D. Increase

309. For given number of passes, pitch & tube diameter, the maximum number of tubes that can be accommodated in a shell of tripled inside diameter will be ____________ times?
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A. Considerably less than 9

B. Considerably more than 9

C. About 9

D. About 3

310. Vertical vessels are not supported by____________________?
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A. Brackets

B. Skirts

C. Columns

D. Saddles

311. Normally, the length to diameter ratio of rotary dryers varies from 4 to 10 and for its economic operation; the number of transfer units (NTU) for such dryers varies from ?
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A. 7.5-10.0

B. 3.5-5.5

C. 15-Oct

D. 1.5-2.5

312. Pick out the wrong statement pertaining to a shell and tube heat exchanger ?
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A. The maximum value of baffle spacing is equal to the I.D. of the shell

B. Disk and doughnut baffle is the most commonly used baffle

C. The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these

D. The minimum value of baffle spacing is 50 mm

313. The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is____________________?
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A. 0.75

B. 0.25

C. 1.25

D. 0.5

314. Tube height in a calandria type evaporator is normally less than _______________ metres?
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A. 3.5

B. 5.5

C. 2

D. 1

315. Pick out the wrong statement?
0

A. A loop seal or U-seal is provided in a vertical condenser sub-cooler to prevent quick draining

B. the condensate

C. Safety valves are provided in heat exchangers for removal of non-condensable

D. Liquid metals and Dowtherm are used for very high temperature heating

E. In a shell and tube heat exchanger, high pressure fluid is generally routed through the tube

316. Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the_____________________?
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A. Troutons rule is applicable

B. Liquid/vapor loading across the column remains constant

C. Sensible heat differences are small, because the temperature changes from tray to tray is small

D. All A., B. and C.

317. Pick out the wrong statement. In an agitated vertical cylindrical reaction vessel, the___________________?
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A. Ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1

B. Dished bottom vessel has very high power consumption

C. Filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period

D. Flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids

318. Which of the following efficiencies can be greater than 100% ?
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A. Murphree plate efficiency

B. Point efficiency

C. None of these

D. Overall plate efficiency

319. Maximum acceptable total liquid gradient over a tray is about _______________ mm?
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A. 30.5

B. 45.5

C. 12.5

D. 5.5

320. When one of the fluids is highly corrosive and has fouling tendency, it should_____________________?
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A. Flow at a very slow velocity

B. Preferably flow inside the tube for its easier internal cleaning

C. Flow outside the tube, when the flow is counter-current and inside the tube when the flow is

D. Preferably flow outside the tube

E. current

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