chemical engineering mass transfer MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.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

181. Leaching rate is independent of the________________?
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A. None of these

B. Particle size

C. Temperature

D. Agitation

182. Which is not concerned directly with mass transfer ?
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A. Schmidt number

B. Lewis relationship

C. Sherwood number

D. Froude number

183. Powdery materials can be guarded against caking tendency on storage by___________________?
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A. Providing minimum percentage of voids

B. Having maximum possible points of contact

C. None of these

D. Providing irregular grain size

184. Experimental determination of ________________ is done by wetted wall column method?
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A. Diffusion co-efficient

B. Mass transfer co-efficient

C. NTU

D. None of these

185. The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?
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A. 5

B. 100

C. 1

D. 10

186. When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is _______________ distillation?
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A. Continuous

B. Azeotropic

C. None of these

D. Steam

187. The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?
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A. D ? 1/P1.5

B. D ? 1/P

C. D ? P0.5

D. D ? 1/P0.5

188. Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the ________________ temperature?
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A. Dew point

B. Wet-bulb

C. Dry-bulb

D. Adiabatic saturation

189. _______________ extractor is used for the concentration of radioactive nuclear waste?
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A. Sieve plate

B. Pulsed column

C. Mixer-settler

D. Bollman

190. Large scale drying of wheat is done in a ________________ dryer?
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A. Fluidised bed

B. Spouted bed

C. Tray

D. Vacuum rotary

191. Tower diameter may be decreased by__________________?
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A. Increasing the vapour flow rate

B. Increasing the liquid flow rate

C. Using higher reflux ratio

D. Use of increased tray spacing

192. Water entrained by circulating air in cooling towers is termed as________________?
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A. Blow down

B. Vapor load

C. Drift

D. None of these

193. Leaching of coarse solid lumps is also termed as _____________________?
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A. Dissolution

B. Percolation

C. Agitation and settling

D. Decoction

194. Mass transfer co-efficient is defined as__________________?
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A. Co-efficient = Flux/concentration difference

B. None of these

C. Flux = Co-efficient/concentration difference

D. Flux=concentration difference/coefficient

195. In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) ?
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A. 6.89

B. 8.89

C. 8.25

D. 10

196. Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of _______________ humidity?
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A. Percentage

B. Molal

C. Relative

D. None of these

197. The main reason for dividing a tall packed tower into series of small towers is to________________________?
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A. Minimise the overall pressure drop

B. Avoid channelling

C. Avoid flooding

D. Reduce liquid hold up

198. The value of NA/(NA + NB) for steady state molecular diffusion of gas A through nondiffusing gas B is____________________?
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A. 2

B. ?

C. 1

D. 0.5

199. Acetic acid will be most economically separated from a dilute solution of acetic acid in water by____________________?
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A. Solvent extraction

B. Evaporation

C. Continuous distillation

D. Absorption

200. Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of _______________ humidity?
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A. Molal

B. Percentage

C. None of these

D. Relative

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