chemical engineering chemical process MCQs – Page 20

Practise multiple-choice questions from chemical engineering chemical process for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical process Mcqs
381. Resistance to fusion of the refractory under a steady rising temperature condition is called ____________________ ?
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A. Spalling

B. Refractoriness

C. Both A. & B.

D. Neither A. nor B.

382. Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is ____________ C?
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A. 30 to 50

B. 5 to 10

C. -5 to 0

D. 75 to 80

383. Styrene is produced from ethyl benzene by the process of__________________?
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A. Dehydrogenation

B. Dehydration

C. Alkylation

D. Oxidation

384. Pick out the false statement pertaining to water treatment ?
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A. Water with pH value less than 7, is acidic

B. The zeolite water softening process reduces the hardness of water by not more than 50%

C. Sodium sulphate or sodium carbonate do not cause hardness in water

D. Aeration of water is effective in CO2 removal

385. Systemic insecticides________________?
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A. Kill insects following external bodily contact

B. Are absorbed throughout the plant

C. Emit poisonous vapour

D. Are stomach poisons

386. Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine ?
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A. None of these

B. Na2CO3

C. NaHCO3

D. H2
387. Analgesic drugs are__________________?
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A. Antibiotics

B. Used in the treatment of T.B.

C. Pain relievers

D. Used in the treatment of typhoid

388. Bromine content in sea water may be around _________________ ppm?
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A. 2500

B. 1875

C. 70

D. 640

389. Hydrazine is largely used____________________?
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A. As rocket fuel

B. In printing industry

C. As a starting material for hypo

D. In photographic industry

390. Argon is the third largest constituent of air (followed by N2 & O2). Its percentage by volume in air is___________________?
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A. 0.14

B. 1.4

C. 0.34

D. 0.94
391. Which of the following is a detergent ?
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A. Polytetrafluoroethylene

B. Alkyl benzene sulphonate

C. Cellulose nitrate

D. Benzene hexachloride

392. Vulcanisation of rubber____________________?
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A. Decreases its tensile strength

B. Increases its oil & solvent resistance

C. Converts its plasticity into elasticity

D. Increases its ozone & oxygen reactivity

393. Pick out the wrong statement ?
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A. Raw materials for DDT manufacture are benzene and chlorine

B. Ethanolamines are produced by using ammonia and ethylene oxide as raw material

C. Catalytic hydrogenation of carbon monoxide produces methyl alcohol

D. In nylon-6, the number 6 represents the total number of carbon atoms in the ring

394. The process involved in converting rubber into a thin sheet or coating it on fabric is called ___________________?
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A. Mastication

B. Calendaring

C. Vulcanisation

D. Extrusion

395. Ultimate analysis of coal determines its _______________________ content?
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A. Carbon, volatile matter, ash & moisture

B. Carbon, hydrogen, nitrogen & sulphur

C. Carbon, ash, sulphur & nitrogen

D. Carbon, sulphur, volatile matter & ash
396. ______________ is produced using molasses as the starting raw material ?
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A. Dimethyl ether

B. Methyl alcohol

C. Ethyl alcohol

D. Benzol

397. Pick out the wrong statement ?
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A. Gun powder comprises of 75% salt petre, 15% charcoal and 10% sulphur

B. TNT is a hygroscopic explosive having very high melting point and is non-toxic to human

C. Low intensity explosives are also called propellants, whereas high intensity explosive are

D. ng</strong>

E. led detonators

F. Lead azide is a popular military explosive

398. Reverse osmosis is normally used for the_______________?
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A. Separation of helium from natural gas

B. Purification of oxygen

C. Desalination of brackish water to produce potable (drinking) water

D. Separation of isotopes of uranium from gaseous uranium hexafluoride

399. Dacron is a/an _________________?
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A. Polyamide

B. Polyester

C. Unsaturated polyester

D. Inorganic polymer

400. Addition of calcium oxide to water produces___________________?
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A. Exothermic heat

B. All A , B. & C .

C. Slaked lime

D. Hissing sound