chemical engineering mass transfer MCQs – Page 9

Practise multiple-choice questions from chemical engineering mass transfer for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering mass transfer Mcqs

161. In extraction, as the temperature increases, the area of heterogeneity (area covered by binodal curve)________________?
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A. Decreases

B. None of these

C. Increases

D. Remains unchanged

162. Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?
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A. Cost

B. Porosity

C. Durability

D. Size

163. With increase in temperature, the mutual solubility of two liquids___________________?
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A. Remains unchanged

B. Increases

C. Decreases exponentially

D. Decreases

164. Packed column distillation is limited to the column _____________ metres?
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A. Height < 6

B. Diameter < 0.6

C. Both A. & B.

D. Neither A. nor B.

165. A slurry is to be dried to produce flaky solid. Which dryer would you recommend ?
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A. Rotary dryer

B. Drum dryer

C. Dielectric dryer

D. Spray dryer

166. _____________ extractor is used for the concentration of radioactive nuclear waste?
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A. Sieve plate

B. Bollman

C. Mixer-settler

D. Pulsed column

167. Diameter of raschig rings used in packed tower in industry is normally around _____________________ inches?
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A. 12

B. 18

C. 8

D. 2

168. In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of _______________ is zero?
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A. Gas phase

B. All A , B. & C.

C. Liquid phase

D. Interface

169. Raschig ring made of porcelain cannot be used for treating concentrated___________________?
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A. Hydrochloric acid

B. Nitric acid

C. Sulphuric acid

D. Alkalis

170. Paper industry employs _____________ driers ?
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A. Rotary

B. Cylinder

C. Fluidised bed

D. Spray

171. Pressure drop through plate tower as compared to that through packed tower, for the same duty will be___________________?
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A. Either A. or B.; depends on the packing height

B. Less

C. Equal

D. More

172. At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes_____________________?
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A. 1

B. 0

C. ?

D. None of these

173. Lewis number (Le) is____________________?
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A. Sc Pr

B. Sh Pr

C. Pr St

D. St Sh

174. Reboiler is considered as one theoretical plate, because_____________________?
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A. Reboiler itself contains one plate

B. None of these

C. Vapour is recycled to the column

D. Of the assumption that vapour and liquid leaving the reboiler are in equilibrium

175. The wet and dry bulb temperature for a vapour-gas mixture are 25C and 30C respectively. If the mixture is heated to 45C at constant pressure, the wet bulb temperature will be ______________ C?
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A. > 25

B. 25

C. 25

D. < 25

176. With increase in temperature, the rate of leaching increases, because the___________________?
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A. Diffusivity of solute increases

B. Thermal conductivity of solute increases

C. Viscosity of solvent decreases

D. None of these

177. Design calculation for multiple component distillation is done by_________________?
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A. Tray to tray calculations

B. Enthalpy concentration method

C. Ponchon-Savarit method

D. McCabe-Thiele method

178. Large scale usage of flash distillation is practised in __________________?
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A. Polymerisation industry

B. Ammonia synthesis plant

C. Soap manufacturing

D. Petroleum refining

179. In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be___________________?
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A. 2 metres above the ground

B. At ground level

C. 5 metres above ground

D. 10 metres above ground

180. Reverse osmosis is also called_________________?
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A. Dialysis

B. Ultra-filtration

C. Diffusion

D. Electrodialysis

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