chemical engineering Mcqs
1301. Drinking (potable) water treatment does not involve __________________?
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A. Softening

B. Coagulation

C. Disinfection

D. Sedimentation

1302. Pick out the wrong statement?
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A. Net sales realisation (NSR) = Gross sales selling expenses

B. At breakeven point, NSR is more than the total production cost

C. Gross margin = net income net expenditure

D. Net profit = Gross margin depreciation interest

1303. Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine ?
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A. NaHCO3

B. H2

C. Na2CO3

D. None of these

1304. Pick out the wrong statement?
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A. Return on equity = profit after tax/net worth

B. Working capital turnover ratio = sales/net working capital

C. Total cost of production is more than net sales realisation (NSR) at breakeven point

D. Net worth means paid up share capital and reserve & surplus (i.e. shareholders equity)

1305. In primitive days, _____________ was being manufactured by Leblanc Process ?
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A. Calcium carbide

B. Alum

C. Washing soda

D. Soda ash
1306. In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ? 2SO3), the reverse reaction becomes appreciable at a temperature of 550 C. The percentage equilibrium conversion of SO2 to SO3 can be increased by ?
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A. Maintaining low temperature & pressure in the converter

B. Removing some quantity of SO3 during intermediate stage

C. Putting more quantity of V2O5 catalyst in the converter

D. Increasing the oxygen concentration

1307. Which of the following is not a food additive ?
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A. Ammonium chloride

B. Invertage

C. Citric acid

D. Benzoyl peroxide

1308. Black liquor is converted into white liquor by __________________________?
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A. Evaporation and burning the concentrate followed by causticisation of products

B. Multi-effect evaporation only

C. Selective liquid extraction

D. Extractive distillation

1309. RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically____________________?
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A. Cyclo tetramethylene tetranitramine

B. Cyclo trimethylene trinitramine

C. Trinitro resorcinol

D. Trinitrobenzene

1310. Detergent is produced by the sulphonation of dodecyl benzene, which is an ________________ reaction?
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A. Endothermic

B. Exothermic

C. Irreversible

D. Both B. and C.
1311. Bakelite is chemically known as_____________________?
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A. Polyurethane

B. Polyvinyl chloride (PVC)

C. Phenol formaldehyde

D. Polybutadiene

1312. Calgon used in water treatment is chemically ____________________?
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A. Sodium hexametaphosphate

B. Sodium phosphate

C. Calcium phosphate

D. Tricresyl phosphate

1313. ______________ is an ore concentrating metallurgical process involving a chemical change?
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A. Electromagnetic separation

B. Roasting

C. Froth floatation

D. None of these

1314. A unit operation is exemplified by the process of ___________________?
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A. Combustion

B. Nitration

C. Desorption

D. Reduction

1315. Wax is a___________________?
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A. Mixture of glycerides of fatty acids

B. Mixture of glycerides

C. Liquid at room temperature

D. Mixture of esters of polyhydric alcohols excepting glycerine
1316. Titanium dioxide is a/an ___________________ colour pigment?
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A. Blue

B. Yellow

C. Black

D. White
1317. Which of the following processes is absent in glass manufacturing process ?
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A. Shaping or forming

B. Sintering

C. Melting

D. Annealing

1318. The most economical pulp for the production of newsprint would be the _____________________ pulp?
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A. Sulphite

B. Ground-wood

C. Semi-chemical

D. Sulphate

1319. 90% of the caprolactam is converted to nylon-6 on its condensation polymerisation in the reactor maintained at _____________ C ?
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A. < 0

B. 250-280

C. 10-30

D. 500-600

1320. Pick out the wrong statement ?
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A. Water gas is called blue gas because of the color of the flame, when it is burnt

B. Strongly caking coal should not be used in the Lurgi gasifier

C. Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels

D. Acetylene gas cannot be used for illumination purpose
1321. Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its________________?
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A. Greater tendency of decomposition at elevated temperature

B. Hydrolysis tendency in presence of water

C. Poor oxidation stability and high gum forming tendency

D. All A, B. and C
1322. Pick out the true statement pertaining to water treatment ?
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A. Slow sand filters can remove colour completely

B. Activated carbon can be used for taste & odour control without subsequent filtration

C. Application of activated carbon reduces the temporary hardness of water

D. Normally, the turbidity is removed by adding a coagulant prior to sedimentation
1323. Esterification reaction___________________?
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A. Is a reaction between an alcohol and an organic acid

B. All A, B. and C.

C. Is reversible

D. Produces soap

1324. Alum [Al2(SO4)3] is used as a coagulant in water treatment to remove____________________?
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A. All A , B. and C.

B. Colour

C. Bacteria

D. Turbidity

1325. In the manufacture of viscose rayon, the raw material used industrially is ____________________?
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A. Bagasse

B. Fine teak wood

C. Eucalyptus wood

D. Bamboo

1326. Hydrogenation of edible vegetable oils_________________?
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A. Is done in presence of nickel catalyst

B. Is an exothermic reaction

C. Increases their melting point

D. All A , B. and C.
1327. ______________ paper is used in the manufacture of newsprint paper ?
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A. Board

B. Tissue

C. Ground-wood

D. Wrapping

1328. Pick out the wrong statement ?
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A. None of these

B. Cold rubber (SBR) is superior as compared to hot rubber (SBR)

C. Polymerisation temperature can modify the properties of SBR

D. Production of cold SBR employs lower pressure as compared to that of hot SBR

1329. Roasting of metallurgical ores is done mainly to ___________________?
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A. Sinter the ore

B. Dehydrate it

C. Remove CO2 & H2O

D. Remove arsenic & sulphur
1330. Type of glass used in optical work is the ___________________ glass?
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A. Fibre

B. Lead

C. Borosilicate

D. Soda-lime

1331. BHC (Benzene hexachloride) is made by the chlorination of benzene_____________________?
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A. Which is a substitution reaction

B. In absolute dark

C. Which is an addition reaction

D. In presence of sunlight

1332. Starting raw material for the manufacture of Maleic anhydride is___________________?
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A. Neither A. nor B.

B. Benzene

C. Either A. or B.

D. n-butene

1333. Brackish water which contains mostly dissolved salt, can be purified by the __________________ process?
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A. Sand filter

B. Permutit

C. Reverse osmosis

D. Lime soda

1334. Fermentator temperature during production of alcohol from molasses is around ______________ C?
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A. 5

B. 300

C. 130

D. 30
1335. Removal of dirt/soil by soaps or detergent does not involve the _______________ of soil ?
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A. Wetting

B. Emulsification

C. Dispersion

D. Precipitation
1336. Bromine is used in the preparation of___________________?
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A. All A , B. and C.

B. Dyes and antiknock compounds

C. Fire proofing agents

D. Fire extinguishing compounds

1337. Saponification value/number of an oil or fat is a measure of its ___________________?
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A. Average molecular weight

B. Degree of unsaturation of the fatty acids present in it

C. Insoluble fatty acid content

D. Fatty acid content

1338. Concentration of hydrogen peroxide is done by_____________________?
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A. Crystallisation

B. Dehydration

C. Vacuum crystallisation

D. Atmospheric distillation

1339. Cellulose percentage in bamboo fibre is about_________________?
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A. 85

B. 50

C. 10

D. 20

1340. Solvent used for extraction of oil is_____________________?
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A. Methyl ethyl ketone

B. None of these

C. Furfural

D. Hexane

1341. Analgesic drugs are__________________?
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A. Used in the treatment of typhoid

B. Pain relievers

C. Used in the treatment of T.B.

D. Antibiotics

1342. Pick out the wrong statement pertaining to nitric acid ?
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A. Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO2)

B. About 90% of nitric acid is manufactured by Ostwalds process

C. It is a strong mono basic acid which reacts with almost all the metals except noble metals

D. Arc process of nitric acid manufacture is economical as compared to Ostwalds process
1343. Chemical name of alum is__________________?
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A. Aluminium chloride

B. Calcium sulphate

C. Aluminium sulphate

D. Barium sulphate

1344. Temporary hardness of water can be removed by__________________?
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A. Boiling

B. Addition of lime

C. Filtration (through gravity sand filter)

D. Addition of alum (a coagulant)

1345. H2S is scrubbed from refinery gases by absorption using ________________________?
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A. Ethanol amine

B. Chilled water

C. Dilute H2SO4

D. Tri-butyl phosphate

1346. Dichloro diphenyl ________________ is the full form of DDT (an insecticide) ?
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A. Trichloromethane

B. Trichloroethane

C. Tetrachloromethane

D. Tetrachloroethane

1347. Epoxy resin__________________?
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A. Is an elastomer

B. Is a good adhesive

C. Cannot be used for surface coatings

D. Is a polyester

1348. The gasification reaction represented by, C + H2O = CO + H2, is a/an _________________ reaction?
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A. Endothermic

B. Catalytic

C. Exothermic

D. Autocatalytic

1349. Pick out the false statement pertaining to water treatment ?
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A. Water with pH value less than 7, is acidic

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

C. Aeration of water is effective in CO2 removal

D. The zeolite water softening process reduces the hardness of water by not more than 50%
1350. Pick out the wrong statement ?
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A. Total sugar content in molasses is about 10%

B. centration of enzymes

C. pectively

D. Wine, rum & Vodka are prepared by the formulation of fruit juice, sugar beet & rye

E. Protein catalysts are called enzymes

F. The rate of chemical reaction is independent of the concentration of reactants at high