chemical engineering MCQs – Page 265

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 Review each marked answer and report any item that may be outdated or unclear.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
5281. Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about ______________C?
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A. 105

B. 85

C. 145

D. 70

5282. Plexiglass (also called Lucite) because of its high optical transparency is used for making lenses. It is chemically_________________?
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A. Polycarbonates

B. Polymethyl methacrylate (PMMA)

C. Phenolic resins

D. Polytetrafluroethylene (PTFE)

5283. _____________ is a thermosetting plastic ?
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A. PVC

B. Polythene

C. Bakelite

D. Polystyrene

5284. Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?
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A. Sinter making

B. Iron blast furnace

C. Domestic ovens

D. Cupola in foundries

5285. Most of the plastics are safe to be used upto a maximum temperature of ______________ C?
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A. 450

B. 150

C. 100

D. 350

5286. Which of the following is a natural polyamide fiber?
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A. Wool

B. Silk

C. None of these

D. Cotton

5287. The shift conversion reaction taking place during water gas manufacture is given by__________________?
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A. CO + H2O ? CO2 + H2

B. None of these

C. C + 2H2O ? CO2 + 2H2

D. C + H2O ? CO + H2

5288. Styrene butadiene rubber is commercially manufactured by__________________?
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A. Emulsion polymerisation

B. Suspension polymerisation

C. Bulk polymerisation

D. Solution polymerisation

5289. Which of the following is the lowest cost plastic commercially available ?
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A. Teflon

B. Bakelite

C. Polythene

D. PVC

5290. The generic chemical name for the class of polymers which are commercially known as nylons is______________________?
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A. Polyacrylate

B. Polyamide

C. Polyurethane

D. Polyolefins

5291. For every 10% increase in the excess air; the fuel consumption increases by _______________ percent?
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A. 1

B. 0.1

C. 0.2

D. 0.5

5292. L.D. converter gas (produced in steel plant) comprises mainly of ___________________?
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A. CO2 & H2

B. CO (upto 65%) & CO2

C. CO2 & O2

D. CO & O2

5293. Benzoyl chloride is not used as a catalyst in the manufacture of___________________?
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A. Polypropylene

B. Polystyrene

C. Polyvinyl acetate

D. Polyvinyl chloride-co-vinyl acetate

5294. Main constituent of natural rubber is_________________?
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A. Polystyrene

B. Polybutadiene

C. Polyisoprene

D. Poly chloroprene

5295. Trade name of ______________ is neoprene?
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A. Polychlorophrene

B. Poly vinyl acetate

C. Polyisoprene

D. Polytetrafluoroethylene

5296. Thermal pyrolysis of ethylene dichloride produces ____________________?
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A. Ethylene oxide

B. Vinyl chloride

C. Ethanol amine

D. Trichloroethylene

5297. Which of the following is not endothermic ?
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A. Cracking

B. Gasification

C. Partial oxidation

D. Reforming

5298. Nylon-66 compared to nylon-6 has __________________?
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A. rasion resistant properties

B. All A., B. and C.

C. Higher hardness

D. Lower melting point

5299. Plastic articles are normally produced by _____________ moulding?
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A. Dry sand

B. Green sand

C. Injection

D. Shell

5300. Nitrogen in coal_________________?
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A. Is recovered as ammonia during its carbonisation

B. Is present upto 1-2%

C. All A., B. and C.

D. Comes from protein in parent vegetable matter