chemical engineering MCQs – Page 103

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 Review each marked answer and report any item that may be outdated or unclear.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

2041. An Azeotropic mixture is a ________________ mixture?
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A. Binary

B. None of these

C. Constant boiling point

D. Ternary

2042. Entrainer used in Azeotropic distillation should____________________?
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A. Have high viscosity to provide high tray efficiency

B. Form a low boiling azeotrope with one of the constituents of the mixture

C. Have high latent heat of vaporisation

D. Form a new azeotrope of low relative volatility with one of the constituents of the mixture

2043. Langmuir equation is associated with________________________?
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A. Steam distillation

B. Leaching

C. Multi-component absorption

D. Adsorption

2044. Radioactive nuclear waste is treated in____________________?
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A. Mixer-settler extractor

B. Pulsed column extractor

C. Bollman extractor

D. Rotating-disc contactor

2045. Pick out the correct statement?
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A. Diffusivity increases with increase in molecular weight

B. None of these

C. Diffusivity decreases with increase in temperature

D. Diffusivity increases with the size of the individual molecule

2046. In extractive distillation, solvent is_____________________?
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A. Added to alter the relative volatility of the mixture

B. Of high volatility

C. Of high viscosity to give high tray efficiency

D. Present in overhead stream

2047. In case of an absorber, the operating _______________?
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A. Line can be either above or below the equilibrium curve

B. Line always lies below the equilibrium curve

C. Line always lies above the equilibrium curve

D. Velocity is more than the loading velocity

2048. Which of the following solutions will follow Raoults law most closely ?
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A. 35% solution of camphor in water

B. A solution of polar organic compounds (not of homologue of a series)

C. 35% solution of NH3 in water

D. A solution of benzene, toluene and o-xylene

2049. Wetted wall tower experiment determines the__________________?
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A. Volumetric co-efficient

B. Molal diffusivity

C. None of these

D. Mass transfer co-efficient

2050. The diffusion co-efficient in m2/s. of acetic acid in benzene (liquid in liquid) is___________________?
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A. 2.09 10-5

B. 2.09 10-4

C. 2.09 10-12

D. 2.09 10-9

2051. The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by___________________?
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A. Decreasing the total pressure

B. Increasing the liquid film co-efficient

C. Increasing the total pressure

D. Increasing the gas film co-efficient

2052. For absorbing a sparingly soluble gas in a liquid ___________________?
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A. Gas side mass transfer co-efficient should be increased

B. Mass transfer co-efficient must be kept constant

C. Liquid side mass transfer co-efficient should be decreased

D. Liquid side mass transfer co-efficient should be increased

2053. In liquid-liquid extraction, the number of phases at plait point is __________________?
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A. 4

B. 1

C. 2

D. 3

2054. During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the___________________?
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A. Gas film

B. Liquid film

C. Liquid-gas interface

D. None of these

2055. As per Gillilands equation, the diffusivity is___________________?
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A. Inversely proportional to P

B. Directly proportional to T1.5

C. Dependent on the molecular volume & molecular weight of components

D. All A , B. & C.

2056. The recovery of penicillin from the acidified fermentation broth is done by__________________?
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A. Evaporation

B. Absorption

C. Distillation

D. Liquid extraction

2057. Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the _______________ moisture?
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A. Critical

B. None of these

C. Bound

D. Unbound

2058. Pick out the wrong statement ?
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A. l column, in case of liquid-liquid extraction

B. reases for a given L/V ratio

C. Natural draft cooling towers are made of ferroconcrete and its cross-section is wider at the

D. Vander wall adsorption is also called chemisorption

E. The extraction per unit of total height for a short packed column is more effective than for a

F. With decrease in feed temperature, the number of plates required for binary distillation

2059. Pick out the wrong statement?
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A. reases, in case of gas absorption process

B. When the concentration difference for the mass transfer becomes zero at the bottom of the gas

C. The operating line lies above the equilibrium curve in case of a gas desorber

D. io is also large in case of a counter current gas absorption tower

E. The average distance between the operating line and equilibrium line is large, when the liquidgas

F. orption tower, then the upper end of the operating line touches the equilibrium curve

2060. Which is the controlling factor for a drum drier ?
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A. Diffusion

B. Heat transfer

C. Both A. and B.

D. Neither A. nor B.

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