chemical engineering MCQs – Page 270

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 Review each marked answer and report any item that may be outdated or unclear.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
5381. Unbreakable crockeries are made from ______________ polymers?
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A. Polyurethane

B. Melamine

C. Polystyrene

D. Polystyrene

5382. The gas which contributes maximum to the heating value of natural gas is __________________?
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A. CO

B. H2

C. CH4

D. CO2

5383. Rayon is a ____________ fibre?
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A. Natural

B. Cellulosic

C. Polyester

D. Polyamide

5384. Cellulose content in bamboo fibre is about ______________ percent?
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A. 10

B. 85

C. 50

D. 20

5385. Polyvinyl chloride (PVC) ____________________?
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A. Uses either emulsion or suspension polymerisation methods

B. Is produced by Polycondensation reaction

C. Softening temperature is 200C

D. Can be made thermosetting by adding a plasticiser

5386. The main drawback of supplying more excess air in the combustion of fuel is the_________________?
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A. Intermittent and uncontrolled combustion of the fuel

B. High exit flue gas temperature from the furnace

C. Excessive power requirement of air blower

D. Enhanced sensible heat loss in the flue gas
5387. Commercial production of polypropylene employs _____________ polymerisation?
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A. Bulk

B. Emulsion

C. Solution

D. Suspension

5388. A gaseous fuel in order to develop luminosity on burning, must contain __________________?
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A. Hydrogen

B. Oxygen

C. Hydrocarbons

D. Carbon monoxide

5389. Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is_________________?
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A. 200 F

B. 200 K

C. 200 R

D. 200 C

5390. Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA) ?
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A. Perspex

B. Lucite

C. Teflon

D. Plexiglass

5391. Lavatory cisterns are normally made of ________________?
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A. Perspex

B. Expanded polystyrene

C. Saturated polyester

D. PVC

5392. The starting material used for the manufacture of caprolactam is________________?
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A. DMT

B. Ethyl benzene

C. Ethylene glycol

D. Cyclohexane
5393. Adipic acid is an intermediate in the manufacture of _____________________?
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A. Nylon-66

B. Bakelite

C. Polystyrene

D. Perspex

5394. Vulcanisation of rubber_____________________?
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A. Increases its ozone & oxygen reactivity

B. Decreases its tensile strength

C. Increases its oil & solvent resistance

D. Converts its plasticity into elasticity
5395. Which of the following would require least amount of secondary air for combustion ?
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A. Bituminous coal containing 20% ash and 25% volatile matter

B. Anthracite containing 10% volatile matter and 8% ash

C. Semi-bituminous coal containing 25% ash and 20% volatile matter

D. Coke breeze containing 25% ash and 2% volatile matter
5396. With increase in the oxygen content of the coal, its ______________ decreases?
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A. Calorific value

B. Caking power

C. Both A. & B.

D. Neither A. nor B.

5397. All thermoplastic, thermosetting & elastic materials can be processed in a extrusion machine, however it cannot be used for the production of plastic_______________?
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A. Pipes

B. Filaments

C. Tubings

D. Buckets
5398. Which of the following is not a polyolefin ?
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A. Polypropylene

B. None of these

C. Polystyrene

D. Neoprene
5399. Linear polymers are normally_________________?
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A. Elastometric

B. Thermosetting

C. Thermoplastic

D. Having extremely high softening point

5400. Low density polythene as compared to high density polythene is____________________?
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A. Harder

B. Tougher

C. More flexible

D. Chemically inert