chemical engineering MCQs – Page 101

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 Review each marked answer and report any item that may be outdated or unclear.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

2001. Pick out the wrong statement?
0

A. The operating pressure in solvent extraction system should be below vapor pressures of all

B. The operating line always lies below the equilibrium solubility curve in case of a single

C. ponent stripper

D. The operating line always lies above the equilibrium solubility curve in case of a single

E. ponent absorber

F. ponents</strong>

2002. As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches ____________________?
0

A. Zero

B. None of these

C. That of normal condensation

D. Integral heat of adsorption

2003. Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be_________________?
0

A. < 1

B. ? 1

C. > 1

D. 1

2004. With increase in the concentration of the adsorbate, the integral heat of adsorption____________________?
0

A. May increase or decrease; depends on the type of adsorbate

B. Decreases

C. Increases

D. Remains unchanged

2005. Make up water is required in a cooling tower to replace the water lost by___________________?
0

A. Evaporation

B. Drift

C. All A., B. and C.

D. Blowdown and leakage

2006. If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that___________________?
0

A. On heating, a vapor phase will appear; while on cooling, a solid phase will appear

B. The system comprises of partially miscible liquids

C. The system comprises of an azeotrope

D. The system comprises of miscible liquids

2007. _______________ developed the film theory ?
0

A. Higbie

B. Ergun

C. Levenspiel

D. Fick

2008. When the liquid phase and vapour phase of a binary system obeys Raoults and Daltons law respectively, the relative volatility is the ratio of________________________?
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A. Vapour pressure of component A to the partial pressure of A

B. Vapour pressure of component A to that of component B

C. Vapour pressure of component A to the total pressure

D. Partial pressure of component A to the total pressure

2009. Chemisorption (chemical adsorption) is_______________________?
0

A. A reversible phenomenon

B. Characterised by adsorption of heat

C. An irreversible phenomenon

D. Same as Van der Waals adsorption

2010. Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the ________________ of a fibre ?
0

A. Strength

B. Electrical resistance

C. Thermal conductivity

D. None of these

2011. Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid) ?
0

A. p << P

B. p >>P

C. p = P

D. p < P

2012. A minimum boiling azeotrope is exemplified by__________________________?
0

A. Water-isobutyl alcohol

B. None of these

C. Acetone-carbon disulphide

D. Toluene-benzene

2013. Rotary dryers cannot handle _______________ materials ?
0

A. Sticky

B. Granular

C. Free flowing

D. Dry

2014. A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternary system containing two pairs of partially miscible liquids ?
0

A. 0

B. 3

C. 2

D. 1

2015. Heat sensitive materials with very high latent heat of vaporisation may be economically separated using__________________?
0

A. Evaporation

B. Liquid extraction

C. Absorption

D. Distillation

2016. The rough value of diffusion co-efficient of water vapor into air at 25C may be about ______________ cm2/sec?
0

A. 0.0025

B. 0.25

C. 1.25

D. 2.5

2017. In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit) ?
0

A. Straight

B. Parallel

C. Both A. & B.

D. Neither A. nor B.

2018. As the reflux ratio in a distillation column is increased from the minimum, the______________________?
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A. Liquid flow increases while the vapor flow decreases for a system

B. Total cost first decreases and then increases

C. Slope of the operating line in stripping section decreases

D. Number of plates decreases very slowly first and then more and more rapidly

2019. Pick out the wrong statement ?
0

A. Even a forced draft cooling tower cannot cool water below the wet bulb temperature

B. Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele

C. tillation column</strong>

D. hod of theoretical plate calculation for distillation column

E. Heat removal load on cooler remains constant, even with increase of the reflux ratio in a

F. Different solids have different equilibrium moisture curves

2020. Leaching of coffee from coffee beans is done by___________________?
0

A. Hot water

B. Dilute H2SO4 (hot)

C. Lime water

D. Hexane

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