chemical engineering MCQs – Page 80

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 Review each marked answer and report any item that may be outdated or unclear.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
1581. According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (?AB = 2) does not change appreciably in the column ?
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A. 9

B. 28

C. 5

D. 12

1582. Adipic acid is an intermediate in the manufacture of________________?
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A. Polystyrene

B. Bakelite

C. Nylon-66

D. Perspex

1583. The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3)_________________?
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A. 900

B. 800

C. 500

D. 1200

1584. A natural draft cooling tower is filled with wooden grids, which covers about _________________ percent of the tower height?
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A. 10-15

B. 70-80

C. 90-100

D. 30-40

1585. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?
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A. Availability

B. Selectivity

C. Cost

D. Toxicity

1586. During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160C, as_______________________?
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A. It is very corrosive at elevated temperature

B. None of these

C. It decomposes on further increasing the temperature

D. ther reduced)</strong>

E. Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be
1587. Electro deposition of metals i.e. electroplating is never done on_____________________?
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A. Metals

B. Alloys

C. Refractories

D. Non-metals

1588. Deaeration of water in its treatment is necessary, as it___________________?
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A. None of these

B. Minimises its turbidity

C. Helps in controlling its taste and odour

D. Minimises its corrosiveness
1589. Acetone is produced by catalytic dehydrogenation of_________________?
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A. Ethyl benzene

B. Naphthalene

C. Isopropanol

D. Phenol

1590. A slurry is to be dried to produce flaky solid. Which dryer would you recommend ?
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A. Spray dryer

B. Dielectric dryer

C. Rotary dryer

D. Drum dryer

1591. The mass transfer co-efficient for a solid sphere of radius a dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is _____________________?
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A. Dependent on the Reynolds number

B. Proportional to ?D

C. D/2a

D. D/a

1592. Minimum reflux ratio in a distillation column results in_____________________?
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A. Maximum condenser size

B. Optimum number of trays

C. Minimum number of trays

D. Minimum reboiler size

1593. In the production of soda ash by Solvay process, the by-product is____________________?
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A. NH3

B. NaOH

C. CaCl2

D. NH4Cl

1594. Desulphurisation of petrol is done in a _____________________?
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A. Packed extraction column

B. Plate type extraction column

C. Rotating disc extractor

D. Bollman extractor

1595. Cement setting under water employs a/an _______________ process ?
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A. Reduction

B. Hydration

C. Decomposition

D. Oxidation

1596. Sodium salt of higher molecular weight fatty acid is termed as the ______________________ soap?
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A. Lubricating

B. Metallic

C. Soft

D. Hard

1597. Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces ________________?
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A. PVC

B. Dacron

C. Polyester

D. Nylon-6

1598. At 750K and 1 atm, the approximate value of Schmidt number for air is_________________?
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A. 0.1

B. 0.01

C. 1

D. 10

1599. Which of the following is used as a binding material in soap to improve soap texture ?
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A. Sodium carbonate

B. Benzyl acetate

C. Borax

D. Rosin

1600. Experimental determination of ________________ is done by wetted wall column method?
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A. None of these

B. Diffusion co-efficient

C. NTU

D. Mass transfer co-efficient