chemical engineering MCQs – Page 266

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 Review each marked answer and report any item that may be outdated or unclear.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
5301. Thermosetting materials_________________?
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A. Are solvent soluble

B. Soften on application of heat

C. Are cross-linked molecules

D. None of these

5302. High rate of heating of coke ovens____________________?
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A. May damage its walls due to abrupt excessive swelling of coal

B. None of these

C. Increases the time of carbonisation

D. Produces larger size coke

5303. Poly-methyl-methacrylate, which is an acrylic resin, is also called ___________________?
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A. Thiokol

B. Dacron

C. Plexiglass or Lucite

D. Teflon

5304. Nylon-66 is a polyamide of __________________?
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A. Hexamethylene diamine and adipic acid

B. Vinyl chloride and formaldehyde

C. None of these

D. Adipic acid and methyl amine

5305. Which of the following is not an elastomer ?
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A. Neoprene

B. None of these

C. Nitrile-butadiene

D. Polyisoprene

5306. Starting material for the production of SBR is ____________________?
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A. Ethyl alcohol

B. Ethylene

C. Both A. & B.

D. Neither A. nor B.

5307. In nylon-6, the number 6 represents the total number of_________________?
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A. Hydrogen atoms in the ring

B. Nitrogen atoms in the ring

C. Carbon atoms in the ring

D. Carbon atoms in the linear polymer chain
5308. Thermocol is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten__________________?
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A. Either B. or C.

B. Polystyrene

C. Polyurethane

D. Saturated polyester

5309. Molecular weight of polymers are in the range of__________________?
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A. 109-1011

B. 10 to 103

C. 102-107

D. 107-109

5310. Laboratory gas is obtained by the cracking of____________________?
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A. Kerosene

B. Fuel oil

C. Diesel

D. Gasoline

5311. _____________ has the widest inflammability limit (explosion limit) of all the gases?
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A. Methane

B. Hydrogen

C. Carbon monoxide

D. Acetylene
5312. A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be_________________?
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A. Less

B. More

C. Same

D. Data insufficient; cant be predicted

5313. Melt spinning of polymers involves the forcing of polymer melt through spinnerates (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the _____________ fibres?
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A. Polyester

B. Acrylic

C. Polypropylene

D. Nylon 6:6

5314. Softening point of high density polythene is about ______________ C?
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A. 205

B. 135

C. 85

D. 165

5315. Which of the following is not a natural polymer ?
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A. Polysaccharides

B. Polyisoprene

C. Nucleic acids e.g. RNA and DNA

D. Polyurethane
5316. The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to___________________?
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A. None of these

B. Minimise its corrosion

C. Make it look attractive

D. Avoid radiation heat loss
5317. A coal gasifier operating at 20 atm. (e.g. Lurgi gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having _____________________?
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A. Higher methane content and thus higher calorific value

B. None of these

C. Lower carbon dioxide content

D. Higher carbon monoxide content

5318. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in___________________?
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A. Fine sizes without the presence of any lump

B. Closed space without any ventilation facility

C. Shallow and small piles

D. Large heaps with small surface to volume ratio

5319. Gross calorific value will be equal to the net calorific value for __________________?
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A. CO

B. C2H6

C. H2

D. C2H2

5320. In general, the limit of inflammability/explosion limit of fuel gases is widened by the__________________?
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A. Increase in temperature (i.e. preheating)

B. Use of pure oxygen for combustion instead of air

C. Increase in gas pressure

D. All A., B. & C.