chemical engineering MCQs – Page 95

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 Review each marked answer and report any item that may be outdated or unclear.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

1881. In extraction, as the temperature increases, the area of heterogeneity (area covered by binodal curve)________________?
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A. None of these

B. Increases

C. Remains unchanged

D. Decreases

1882. Unit of molal diffusivity is____________________?
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A. cm2/sec gm . mole

B. gm moles/cm. sec

C. gm moles/cm2 . sec

D. gm moles/cm2. sec

1883. According to Chilton-Colburn analogy for mass transfer, NSt.NSc 2/3 is equal to_________________?
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A. f

B. f/2

C. 2f

D. 1/f

1884. The Hatta number is important in______________________?
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A. Gas absorption without chemical reaction

B. Gas absorption with chemical reaction

C. Multi-component distillation

D. Binary distillation

1885. Wet bulb and dry bulb temperatures becomes identical at _______________ percent saturation curve?
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A. None of these

B. 50

C. 100

D. 78

1886. Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture ?
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A. Anthracite coal

B. Bamboo

C. Rag paper

D. Inorganic solids

1887. In case of unsaturated air____________________?
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A. Dew point < wet bulb temperature

B. Wet bulb temperature < dry bulb temperature

C. Both A. and B.

D. Neither A. not B.

1888. Moisture contained by a substance in excess of the equilibrium moisture is called the _______________ moisture?
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A. Free

B. Unbound

C. Bound

D. Critical

1889. The solvent used in liquid extraction should not have high latent heat of vaporisation, because ______________________?
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A. It cannot be recovered by distillation

B. The pressure drop and hence the pumping cost will be very high

C. Its recovery cost by distillation may be prohibitively high

D. It will decompose while recovering by distillation

1890. The suitable evaporator for concentration of foaming liquids is a ______________________ evaporator?
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A. Short tube

B. Long tube

C. Falling film

D. Vacuum

1891. Ordinary diffusion process is also called ______________ diffusion?
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A. Pressure

B. Thermal

C. Concentration

D. Forced

1892. In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?
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A. Less than 1 kg of C is transferred to B

B. No amount of C is transferred to B

C. The entire amount of C is transferred to solvent B

D. Less than 2 kg but more than 1 kg of C is transferred to solvent B

1893. At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid _______________ that in dry packed tower ?
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A. Is same as

B. Is greater than

C. Cannot be predicted as data are insufficient

D. Is lower than

1894. 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

1895. During constant rate drying period, vaporisation rate per unit drying surface area _____________________?
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A. Decreases with time

B. Does not affect the moisture content of the wet solid

C. Does not change with time

D. Increases with time

1896. Pick out the wrong statement ?
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A. Insecticides acting on the insects through the respiratory system are called fumigants

B. Chloral is obtained by the chlorination of ethyl alcohol

C. Benzene hexachloride is not a contact insecticide

D. DDT is manufactured by the condensation of chlorobenzene with chloral at 30C in presence

E. oleum, which is a highly exothermic reaction

1897. Ammonia present in the coke oven gas is removed by washing with___________________?
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A. Dilute HCl

B. Ethanolamine

C. Caustic solution

D. Dilute ammoniacal liquor

1898. H2S present in naphtha reformed gas is removed by absorbing with___________________?
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A. Ethanolamine

B. Vacuum gas oil

C. K2CO3

D. HCl

1899. The ratio of Murphree plate efficiency to point efficiency is 1 in a ______________________ flow model?
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A. Plug

B. Perfectly mixed

C. Both A. & B.

D. Neither A. nor B.

1900. In case of absorption, both the operating and equilibrium lines will be straight for______________?
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A. Isothermal operation

B. Dilute solutions

C. None of these

D. Dilute solutions and isothermal operation

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