chemical engineering MCQs – Page 269

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 Review each marked answer and report any item that may be outdated or unclear.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
5361. Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to _________________?
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A. Increase its viscosity

B. Protect rubber goods from attack by oxygen & ozone present in the atmosphere

C. Reduce its viscosity to permit easier processing

D. Reduce the time of vulcanisation and quantity of vulcanising agent

5362. Polystyrene is a light, transparent, thermoplastic material used for making __________________?
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A. Non-sticking utensils

B. Toys and combs

C. Packaging bags

D. Electrical insulation

5363. The maximum adiabatic flame temperature in air is _____________ the maximum flame temperature in pure oxygen?
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A. Not related to

B. Higher than

C. Same as

D. Lower than
5364. Catalyst used in the production of high density polythene by low pressure Ziegler process is ____________________?
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A. Nickel

B. Molybdenum

C. Platinum

D. Aluminium triethyl activated with TiCl4
5365. Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is_______________________?
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A. Fe

B. Aluminium triethyl combined with titanium tetrachloride

C. Ni

D. V2O5

5366. C/H ratio is the maximum in case of_________________?
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A. Furnace oil

B. Naphtha

C. Coal

D. Natural gas

5367. Rain coats are made of__________________?
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A. PVC

B. Polyurethane

C. SBR

D. Neoprene

5368. ____________ is a copolymer?
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A. Styrene butadiene rubber (SBR)

B. Neoprene

C. PVC

D. None of these

5369. Condensation polymerisation is not involved in the manufacture of_________________?
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A. Polythene

B. Terylene

C. Nylon

D. Teflon

5370. Lurgi coal gasifier is a pressurised ______________ bed reactor?
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A. Entrained

B. Moving

C. Fixed

D. Fluidised

5371. Properties of a polymer is affected by the____________________?
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A. Chain length

B. Intermolecular forces

C. Both A. and B.

D. None of these

5372. Dry air required to burn 1 kg of carbon completely may be around ______________ kg?
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A. 2

B. 20

C. 38

D. 11
5373. Washing of coal decreases its_________________?
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A. Caking index

B. Mineral matter content

C. Ash content

D. Both B. and C.

5374. Epoxy resin is____________________?
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A. A polyester

B. Not used for surface coating

C. A good abrasive

D. An elastomer

5375. Caking index of the coal blend used for the manufacture of metallurgical coke should be around__________________?
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A. 48

B. 21

C. 40

D. 5

5376. Ion exchange resins are made of____________________?
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A. Lucite

B. Sulphonated Bakelite

C. Teflon

D. Polystyrene

5377. _____________ tubes are good substitute for human blood vessels on heart by-pass operation?
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A. Teflon/Dacron

B. PVC

C. Polythene

D. Polystyrene

5378. Phthalic anhydride is used___________________?
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A. As plasticisers

B. For making nylon-6

C. In insecticides manufacture

D. In making PVC

5379. A travelling grate stoker is meant for the efficient burning of ______________ coal?
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A. Pulverised

B. Non-caking

C. Caking

D. High ash

5380. Elastomers are__________________?
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A. Thermosetting material

B. Having high flexural strength

C. Exemplified by protein derivatives

D. Having very high tensile strength and heat resistance