chemical engineering MCQs – Page 115

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

2281. Which of the following achieves the least reduction ratio for a given feed size ?
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A. Jaw crusher

B. Roll crusher

C. Cone crusher

D. Gyratory crusher

2282. The specific cake resistance for compressible sludges is a function of the pressure drop__________________?
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A. None of these

B. Over cake

C. Overall

D. Over medium

2283. Kicks law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kicks constant is_________________?
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A. kg/sec

B. kWh/sec. kg

C. kWh/kg

D. kW. sec/kg

2284. Which of the following is the hardest material ?
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A. Calcite

B. Corundum

C. Gypsum

D. Quartz

2285. A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for _______________ flow of filtrate?
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A. Compressible cake and turbulent

B. Compressible cakes and laminar

C. Incompressible cake and laminar

D. Incompressible cake and turbulent

2286. _______________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution?
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A. Muller

B. Banbury

C. Tumbler

D. Ribbon blender

2287. Solvent used in extractive distillation___________________?
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A. Should be of high volatility

B. All A., B. and C.

C. Changes the relative volatility of the original components

D. Should form azeotropes with the original components

2288. In case of a ball mill ?
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A. Operating speed should be more than the critical speed

B. Fine feed requires a larger ball

C. Coarse feed requires a larger ball

D. None of these

2289. At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?
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A. 0.4

B. 1

C. 0

D. 0.2

2290. A tube mill as compared to a ball mill__________________?
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A. All A., B. and C.

B. Employs smaller balls

C. Has larger length/diameter ratio (>2 as compared to 1 for ball mill)

D. Gives finer size reduction but consumes more power

2291. Which of the following is not a part of the Blake jaw crusher ?
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A. Pitman

B. Hanger

C. Check plates

D. Toggles

2292. Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called__________________?
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A. Clarification

B. Thickening

C. Froth floatation

D. Classification

2293. Rittingers number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittingers number of a material indicates its________________?
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A. Easier grindability

B. High power consumption in grinding

C. Poor grindability

D. None of these

2294. Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?
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A. 1000C and 10 atm

B. 1000C and 500 atm

C. 200C and 5 atm

D. 500C and 50 atm

2295. A fluid energy mill is used for __________________?
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A. Crushing

B. Ultra-grinding

C. Cutting

D. Grinding

2296. Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a _______________ surface?
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A. Curved

B. Ribbed

C. Either A. or B.

D. Plane

2297. Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?
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A. Pre-coated on the filter medium prior to filtration

B. All A, B. & C.

C. Separated from the cake by dissolving solids or by burning it off

D. Added to the feed slurry

2298. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about _______________ percent of the volume of the mill?
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A. 70

B. 35

C. 50

D. 85

2299. Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the _________________?
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A. Stamp mill

B. Bradfords breaker

C. Cage mill

D. Blake jaw crusher

2300. Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance ? = viscosity of the filtrate) ?
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A. All A., B. & C.

B. 1/R

C. 1/?

D. S

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