chemical engineering process equipment and plant design MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.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
181. The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always ?
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A. Equal to the order of reaction

B. < 1

C. 1

D. > 1
182. The dust collection efficiency of electrostatic precipitator increases with increase in the_________________?
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A. Gas flow rate

B. Electrode area

C. Both A. & B.

D. Neither A. nor B.

183. In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by________________?
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A. (P2 ?d2/4)/?d

B. 4(0.86P2 ?d2/4)/?d

C. 4(0.86P2 ?d2)/?d

D. (4P2 + ?d2/4)/?d

184. Smokers equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the_________________?
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A. Relative volatility is close to one (e.g., separation of close boiling isomers)

B. Number of equilibrium stages in only stripping section is to be calculated

C. Number of equilibrium stages required is likely to be very small

D. Feed is not at its bubble point

185. The diameter of a propeller agitator used in agitation tank ranges from ____________ percent of the tank diameter and its peripheral speed is normally 300 to 500 metres/minute ?
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A. 5 to 10

B. 15 to 30

C. 40 to 50

D. 55 to 75

186. The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line) ?
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A. S1.S2

B. 1/S1.S2

C. S2/S1

D. S1/S2
187. The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally _____________ the tube wall thickness?
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A. Equal to

B. Four times

C. Twice

D. Half

188. Back-trapping in a distillation column results due to_________________?
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A. High gas velocity

B. Low gas velocity

C. Excessive liquid gradient over the tray

D. Low reflux ratio

189. For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by____________________?
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A. Di, opt = 3 Q0.36 ?1.86 ?0.08

B. Di, opt = 3.9 Q0.45 ?0.23

C. Di, opt = 3 Q0.36 ?0.18

D. Di, opt = 7.6 Q0.36 ?0.9

190. ____________________ strain is measured using a strain rosetter ?
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A. Shear

B. None of these

C. Linear

D. Volumetric

191. With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the ______________________ decreases?
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A. Fixed charges initially

B. Running cost of cooling water for condenser

C. Vapour & liquid load both

D. Running cost of steam for reboiler

192. In the downcomer of a distillation column, the minimum recommended residence time is about _______________ seconds?
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A. 17.5

B. 12.5

C. 2.5

D. 5
193. A pressure vessel is said to be made of thick shell, if the ratio of its diameter to wall thickness is_______________?
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A. > 10

B. < 20

C. < 10

D. > 20

194. Rotary driers are most economically designed for the number of heat transfer units (HTU) from _________________?
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A. 5 to 10

B. 1.5 to 2.5

C. 0.01 to 1

D. 10 to 20

195. A claming section before the liquid flows into the downcomer is provided to__________________?
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A. Cool the liquid before it flows down

B. Ensure better vapour-liquid contact

C. Permit release of entrained vapour in the liquid

D. Reduce the discharge fluctuation

196. Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than ______________ mm?
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A. 10

B. 5

C. 20

D. 30
197. A binary liquid Azeotropic mixture has boiling point higher than either of the components, when it shows ______________ deviation from Raoults Law?
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A. Negative

B. No

C. None of these

D. Positive

198. The equivalent diameter for pressure drop is _______________ that for heat transfer?
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A. Not related with

B. Smaller than

C. Equal to

D. Greater than

199. ________________ liquor is best handled in a long tube vertical evaporator ?
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A. Scaling

B. Viscous

C. Salting

D. Foamy
200. Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around_______________?
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A. 0.55-0.85

B. 0.1-0.2

C. 0.35-0.75

D. 0.4-0.6