chemical engineering process equipment and plant design MCQs – Page 17

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 Review each marked answer and report any item that may be outdated or unclear.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
321. Diameter of the sieve tray column is determined by the_________________?
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A. Height of the plate spacing

B. Hole diameter of the sieve tray

C. Upper limit of the vapour velocity

D. Lower limit of vapour velocity

322. Pick out the wrong statement?
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A. The joint made by overlapping of one plate over the other, and then riveting the two plates together with two rows of rivets is called double riveted butt joint

B. The efficiency of a riveted joint is the ratio of the strength of the riveted joint to the strength of the solid plate

C. Riveting provides a permanent fastening method

D. Shank diameter of the rivets should be less than the size of the hole drilled in the plate for riveting

323. Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally ____________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8?)?
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A. Three fourth

B. Equal to

C. 1.5 times

D. Half

324. In a multiple effect evaporator system having n effects, the amount of water evaporated per unit surface area in approximately equal to _____________ times that in a single effect?
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A. 0.5 nth

B. (1/n)th

C. nth

D. 1.5 nth

325. Pick out the wrong statement ?
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A. A reducer is used to change the direction of a pipe in a straight run

B. A pipe is differentiated from a tube by the fact that a pipe has a greater wall thickness

C. The method of fixing tubes to a tube sheet by expanding is called tube rolling

D. Lug supports are less expensive than other type of supports

E. pared to the tube

326. Liquid gradient over a tray can be minimised by________________?
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A. All A., B. and C.

B. liquid must flow

C. ocity of liquid flow past the caps or by reducing the distance along the tray through which

D. Using split flow, radial flow or cascade flow for column diameter large than 4 ft

E. Providing a higher skirt clearance or a higher weir

F. Decreasing the number of rows of caps through which the liquid flows or by decreasing the

327. Ratio of tube length to shell diameter for a shell and tube heat exchanger is________________?
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A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers

B. 4 : 1 to 8 : 1 for liquid-liquid exchanger

C. < 4 : 1 for gas-gas exchangers

D. Both B. & C.
328. Pick out the wrong statement pertaining to Horton sphere used for the storage of liquid ammonia ?
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A. Horton sphere is used for the storage of gases and volatile liquid at a moderate pressure of 1 to 10 kg/cm2

B. Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column

C. Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm2

D. Thickness of spherical shell is half that of the cylindrical vessel under same operating pressure condition. Besides, the ratio of surface area to volume is less for sphere than any other shape; hence insulation required is less

329. Pick out the wrong statement about distillation operation__________________?
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A. In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation

B. Distillation under vacuum is a substitute for steam distillation

C. Flash distillation, differential distillation & steam distillation are all continuous distillation processes

D. In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other

330. The wall thickness of thin cylindrical shell with hemispherical ends is ______________ that of the spherical ends?
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A. Equal to

B. Less than

C. More than

D. Either B. or C.; depends on maximum permissible internal pressure

331. (Le/D) for couplings and unions would be_______________?
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A. 200

B. Negligible

C. 60

D. 350

332. In a bag filter, the pressure drop increases directly as the___________________?
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A. Density of the gas and inversely as viscosity of the gas

B. Density of the gas, but is independent of the viscosity of the gas

C. None of these

D. Viscosity of the gas and inversely as density of the gas

333. _____________ heat exchanger is also known as hair pin type exchanger?
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A. Finned

B. Plate type

C. Regenerative

D. Double pipe
334. The ratio of lateral strain to linear strain is termed as the___________________?
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A. Bulk modulus

B. Modulus of elasticity

C. Poissons ratio

D. Shear modulus

335. Normal screwed fittings are used for pipes upto a diameter of _______________ inches?
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A. 1.5

B. 9

C. 3

D. 5

336. Minimum tube pitch recommended for shell and tube heat exchangers is about _______________ times the outside diameter of the tube?
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A. 2.5

B. 1.25

C. 3.5

D. 1.75

337. Pick out the wrong statement ?
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A. For all the cylindrical process vessels operating above atmospheric pressure, formed heads are used for closing the vessel

B. Fouling factor of river water is less than that of sea water

C. Risers provided in bubble cap trays in the distillation column facilitate the flow of both liquid and vapor

D. Both B. and C.
338. Souders Brown equation given by, U = Kv ?(?l ?v)/?v, is used for the calculation of the ______________ in a continuous distillation column?
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A. Tray pressure drop

B. Diameter of the bubble cap column

C. Diameter of the sieve plate column

D. Residence time in the downcomer for the disengagement of entrained vapour

339. Pick out the wrong statement?
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A. In a sieve tray, the minimum hole diameter is equal to the tray thickness

B. In practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used

C. In a stainless steel sieve tray, the minimum hole diameter is equal to 10 times the plate thickness

D. Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing

340. Pick out the correct statement?
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A. Random packing a packed tower offers the advantage of lower pressure drop and higher throughput of fluids as compared to regular/stacked packing

B. Draining of residual liquid on tray during shut down of distillation column is facilitated by weep holes

C. It is preferred to use a vertical condenser for condensation of vapor from a distillation column without sub-cooling

D. Risers are generally not connected to the plate in a distillation coloumn by bolts, rivets or welding