chemical engineering MCQs – Page 89

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 Review each marked answer and report any item that may be outdated or unclear.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

1761. With increase in temperature, the mutual solubility of two liquids_________________?
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A. Decreases exponentially

B. Decreases

C. Increases

D. Remains unchanged

1762. Experimental determination of _______________ is done by wetted wall column method?
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A. NTU

B. Diffusion co-efficient

C. Mass transfer co-efficient

D. None of these

1763. Pick out the wrong statement ?
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A. nomy

B. Decrease in Murphree plate efficiency is an indication of entrainment in distillation column

C. The capacity of a distillation column is maximum at total reflux

D. In solvent extraction, the distribution co-efficient should be as large as possible for solvent

E. With increase in pressure, the solubility of gases in solvent increases at a fixed temperature

1764. Mass transfer co-efficient is directly proportional to DAB 0.5, according to ________________ theory ?
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A. Penetration

B. Film

C. None of these

D. Surface renewal

1765. Which of the following is an undesirable property in a tower packing ?
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A. Large surface per unit volume

B. Large free cross-section

C. Large weight of liquid retained

D. Low weight per unit volume

1766. Tower diameter may be decreased by__________________?
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A. Use of increased tray spacing

B. Increasing the liquid flow rate

C. Using higher reflux ratio

D. Increasing the vapour flow rate

1767. Components, having widely different boiling point in a binary mixture, can be separated using ________________ distillation?
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A. Extractive

B. Simple

C. Molecular

D. Steam

1768. ADDUCTS and CLATHRATES are used in case of_____________________?
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A. Absorption

B. Crystallisation

C. None of these

D. Extractive distillation

1769. Back-trapping in a distillation column ?
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A. Is desirable, as it provides improved vapour-liquid contact

B. Reduces pressure drop

C. Increases tray efficiency

D. Decreases tray efficiency

1770. Pick out the wrong statement pertaining to the cooling towers ?
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A. Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and

B. discharged air

C. Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb

D. perature is also low

E. In case of induced draft cooling tower, the fan is placed at the top of the tower

F. A natural draft cooling tower is recommended to be used, when the air humidity is low and air

1771. A distillation column separates 10000 kg/hr of a benzene-toluene mixture as shown in the figure below: In the figure xF, xD and xW represent the weight fraction of benzene in the feed, distillate and residue respectively. The reflux ratio is_______________ ?
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A. 0.6

B. 0.5

C. 2

D. 1

1772. Humid volume is the total volume in m3 of 1 kg of _____________________?
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A. Gas plus its accompanying vapour at 1 atm. and gas temperature

B. Gas plus its accompanying vapour at 1 atm. and room temperature

C. Vapour laden gas at 1 atm. and gas temperature

D. Vapour laden gas at 1 atm. and room temperature

1773. During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the _________________ remains constant ?
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A. Wet bulb temperature

B. Partial pressure of water vapor

C. Relative humidity

D. None of these

1774. In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is__________________?
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A. Equal to the heat of formation of surface compound

B. Called integral heat of adsorption

C. Zero

D. Equal to the heat of wetting

1775. Decoction refers to the use of solvent________________?
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A. None of these

B. At its boiling point

C. At ambient temperature

D. In its vapor form

1776. Flooding in a distillation column is detected by a sharp ___________________?
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A. Decrease in pressure drop

B. Increase in Murphree plate efficiency

C. Increase in pressure drop

D. Decrease in liquid hold up in the column

1777. Which of the following equipments is not used for liquid dispersion ?
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A. Packed towers

B. Venturi scrubbers

C. Agitated vessels

D. Wetted wall towers

1778. Plate efficiency in a distillation column is reduced due to the ______________________ of liquid?
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A. Weeping & dumping

B. Foaming

C. Entrainment

D. All A., B. & C.

1779. Flash distillation is suitable for separating the constituents of a binary system, which _____________________?
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A. Form minimum boiling azeotrope

B. Have very wide boiling points

C. Have very close boiling points

D. Form constant boiling azeotrope

1780. McCabe-Thiele method________________?
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A. Uses weight fractions to express liquid and vapour composition

B. Uses molal units for material and energy balance

C. Can use any type of units

D. Is more accurate than Ponchon-Savarit method

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