chemical engineering MCQs – Page 113

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 Review each marked answer and report any item that may be outdated or unclear.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
2241. When adsorption hysteresis is observed, the desorption equilibrium pressure is _________________ that obtained by adsorption?
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A. Same as

B. Dependent on the system; can be either lower or higher than

C. Always higher than

D. Always lower than
2242. The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called__________________?
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A. Elutriation or elution

B. Decoction

C. Percolation

D. None of these

2243. If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are_______________?
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A. Straight

B. Parallel

C. Both A. & B.

D. Neither A. nor B.

2244. Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is _______________ the liquid head available in the downcomer?
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A. Same as

B. More than

C. Less than

D. Very much less

2245. Boiling point diagram is not affected by the ambient______________________?
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A. Pressure

B. Humidity

C. Temperature

D. Both B. and C.
2246. The dew point of a saturated gas phase equals the ________________ temperature?
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A. Gas

B. Room

C. Wet bulb

D. None of these

2247. A cottrell precipitator makes use of the ______________ for dusty air cleaning?
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A. Alternating current

B. Corona discharge

C. None of these

D. Electric spark

2248. Crushing efficiency is the ratio of the ______________________ ?
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A. Energy absorbed by the solid to the surface energy created by crushing

B. Energy absorbed by the solid to that fed to the machine

C. Surface energy created by crushing to the energy absorbed by the solid

D. Energy fed to the machine to the surface energy created by crushing

2249. ______________ are used for the separation of coarse particles from a slurry of fine particles?
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A. Classifiers

B. Hydrocyclones

C. Decanters

D. Thickeners

2250. Paddle agitator_________________?
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A. Produces axial flow

B. None of these

C. Is suitable for mixing low viscosity liquids

D. Moves at very high speed

2251. _______________ is a cohesive solid ?
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A. Sand

B. Wheat

C. Wet clay

D. None of these

2252. Float and sink test determines the possibility of cleaning of coal by a process based on the___________________?
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A. None of these

B. Wettability

C. Particle shape

D. Gravity separation
2253. Which of the following remains constant during sensible cooling process ?
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A. Specific humidity

B. Partial pressure of vapour

C. Both A. and B.

D. Neither A. nor B.

2254. Optimum ratio of operating speed to critical speed of a trommel is_____________________?
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A. 1.5-2.5

B. 0.5-2

C. 0.33-0.45

D. 1.33-1.45

2255. Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________?
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A. Dewaxing of lubricating oil

B. Separation of isotopes based on their density or molecular weights difference

C. Separation of cream from milk

D. Concentration of rubber latex

2256. Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
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A. None of these

B. Rittingers law

C. Bonds crushing law

D. Kicks law

2257. In classification, particles are said to be equal settling, if they have the same terminal velocities in the_______________?
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A. Different fluids

B. Same fluid

C. Same field of force

D. Both B. and C.
2258. Shell and leaf filter as compared to plate and frame filter _____________________?
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A. Provides more effective washing

B. Facilitates filtration under higher pressure

C. All A., B. & C.

D. Entails less labor cost

2259. Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?
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A. Raschig rings

B. Sphere

C. Cylinder (L/D = 1)

D. Cube

2260. Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the___________________?
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A. Coagulation

B. Clarification

C. Sedimentation

D. Flocculation