chemical engineering MCQs – Page 263

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 Review each marked answer and report any item that may be outdated or unclear.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
5241. Pick out the wrong statement pertaining to the roll crushers?
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A. Maximum feed size determines the required roll diameter

B. For hard materials crushing, the reduction ratio should not exceed 4

C. Both the rolls run necessarily at the same speed

D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit

E. surface produced

5242. In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for _______________ fibres?
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A. PVC

B. Polyvinyl acetate

C. Rayon

D. Polythene

5243. Artificially produced radioactive isotopes are used for____________________?
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A. All A., B. and C.

B. Treatment of certain diseases

C. Power generation

D. Initiating nuclear fission and fusion

5244. Pick out the wrong statement ?
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A. Reduced temperature of a substance is the ratio of its existing temperature to its critical temperature, both expressed on Celsius scale

B. Reduced pressure is the ratio of the existing pressure of a substance to its critical pressure

C. Reduced volume is the ratio of the existing molal volume of a substance to its critical molal volume

D. None of these

5245. Polystyrene is a ____________ plastic at room temperature?
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A. None of these

B. Malleable

C. Brittle

D. Ductile

5246. Orion is_________________?
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A. Obtained by polymerising vinyl cyanide

B. A copolymer

C. A condensation polymer

D. All A., B. and C.

5247. Cation exchange resins (0.3 to 1 mm size) used in water treatment is prepared from ______________ resins?
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A. Epoxy

B. Urea formaldehyde

C. Phenol formaldehyde

D. Melamine formaldehyde

5248. Thorium-232 is converted into uranium-233 in a/an ______________ nuclear reactor?
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A. Thermal

B. Fast breeder

C. Heavy water moderated

D. Enriched uranium

5249. Which of the following reactors is operated at high neutron flux and low power level ?
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A. Breeder reactor

B. Heterogeneous reactor

C. Research reactor

D. Liquid metal (e.g., molten sodium) cooled reactor

5250. ____________ polymer is used for making unbreakable crockery?
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A. None of these

B. Melamine

C. Thermoplastic

D. Addition

5251. _____________ is not a polyester fiber?
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A. Dacron

B. Terylene

C. Polyacrylonitrile

D. Nylon
5252. In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the_________________?
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A. Hexamethylene diamine and the ring

B. Hexamethylene diamine and the adipic acid

C. None of these

D. Adipic acid and the ring

5253. A copolymer of vinyl and vinylidene chloride is called_____________________?
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A. Treylene

B. Saran

C. Orlon

D. Dacron

5254. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ?
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A. Ammonium alum

B. Potassium alum

C. Both A. & B.

D. Neither A. nor B.

5255. Which of the following has the weakest intermolecular forces ?
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A. Polyisoprene

B. Bakelite

C. Polystyrene

D. Nylon-66

5256. Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its__________________?
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A. Flexibility

B. All A., B. & C.

C. Tensile strength

D. Chemical resistance

5257. Neoprene which is used for making shoe heels & belts is superior to natural rubber in its stability to aerial oxidation and resistance to oils & other solvents. The monomer used for making neoprene is_________________?
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A. Chloroethane

B. Isoprene

C. None of these

D. Chloroprene
5258. Pick out the wrong statement ?
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A. Gasoline having an octane number of 90 can be produced by alkylation process

B. All the alkylation processes use very high temperature (> 1000C)

C. Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin

D. Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts

5259. Bakelite (phenol-formaldehyde) resin cannot be used as________________?
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A. Electrical insulation

B. Decorative laminates

C. Decorative paint

D. Glass reinforced plastics

5260. In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of__________________?
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A. Polyamides

B. Phenol formaldehyde resins

C. Polyesters

D. Cross linked polystyrene