chemical engineering process equipment and plant design MCQs – Page 12

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 Review each marked answer and report any item that may be outdated or unclear.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
221. For identical situation, condensing film coefficient in case of a horizontal condenser is almost ______________ the value expected in case of vertical condenser?
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A. Thrice

B. Half

C. Five times

D. Twice

222. A binary liquid Azeotropic mixture has boiling point lower than either of the components, when it shows _____________ deviation from Raoults Law?
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A. No

B. None of these

C. Negative

D. Positive
223. In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________?
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A. Are easier to clean

B. Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less

C. Are less prone to fouling

D. None of these

224. The circumferential (hoop) stress in a thin walled cylindrical vessel under internal pressure is______________________?
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A. pd/t

B. pd/2t

C. pd/4t

D. pd/3t

225. Needle valves are generally not used for___________________?
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A. Smaller sizes of pipe

B. High pressure throttling service

C. Very accurate flow control

D. Very large diameter pipes
226. Which of the following material is seldom used for pressure vessel construction ?
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A. Rimmed still

B. Mild steel

C. Semi-killed steel

D. Killed steel

227. An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by______________?
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A. Decrease in gas solubility for absorbers

B. An increase in relative volatility for rectification columns

C. All A., B. and C.

D. An increase in liquid viscosity

228. In a ______________ riveted joint, the rivets in the various rows are opposite to each other?
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A. Chain

B. Zig-zag

C. Diamond

D. None of these

229. A rupture disc is provided in chemical equipments as an accessory meant for ___________________?
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A. Avoiding vortex formation

B. Enhancing mixing rate

C. Relieving excess pressure

D. Creating turbulence

230. In packed towers provided with saddle packing, liquid redistributors are positioned at every _______________ times column diameter or 6 metres whichever is less?
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A. 15-Oct

B. 3-Feb

C. 20-25

D. 5-8
231. In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ? = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?
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A. Z.H.?/L

B. L/Z.H.?

C. H.?/L

D. Z.H/?L

232. The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles ?
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A. To increase the tube side heat transfer co-efficient by inducing turbulence

B. To reduce the induced vibration in the tubes

C. To increase the residence time of shell side fluid

D. To provide support to the tube bundle

233. Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to _____________________?
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A. I.D. of the shell

B. 40% of the I.D. of the shell

C. 25 cms

D. 5 cms
234. Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as d will be__________________?
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A. ?d

B. ?(2d)

C. ?(2?d)

D. d
235. Hold up of material in a operating rotary drier is in the range of___________________?
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A. 0.25 to 0.50

B. 0.8 to 0.9

C. 0.05 to 0.15

D. 0.5 to 0.8

236. Pick out the wrong statement ?
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A. Flat head covers are most suitable for larger vessels operating at very high pressure

B. Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses

C. In a flanged and shallow dished head, the crown radius is > shell outside diameter

D. In a flanged and standard dished head, the crown radius is ? shell outside diameter

237. Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?
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A. 8-Apr

B. 52-68

C. 88-105

D. 17-34
238. Cooling water fouling factors vary in the range of 0.001 to 0.003____________________?
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A. (kcal/hr. m. C)-1

B. (W/m2.K)-1

C. (BTU/hr.ft2. F)-1

D. (kcal/hr.m2.C)-1

239. The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the_________________?
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A. None of these

B. Smaller reactor should come first

C. Equal sized reactors are the best

D. Larger reactor should come first

240. What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers ?
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A. 6.5 cms

B. Equal to tube O.D

C. 6.5 mm

D. Equal to tube I.D