chemical engineering MCQs – Page 268

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 Review each marked answer and report any item that may be outdated or unclear.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
5341. Paper like thin plastic articles can be produced by_________________?
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A. None of these

B. Vacuum thermo forming

C. Injection moulding

D. Blow moulding

5342. Fat coals are those coals which have very high____________________?
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A. Volatile matter content

B. Inherent moisture content

C. Fusion point of its ash

D. Caking capacity
5343. Most commonly used rubber vulcanisation agent is __________________?
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A. Alumina

B. Platinum

C. Bromine

D. Sulphur
5344. ombustion of pulverised coal compared to the lumpy coal __________________?
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A. Provides higher thermal efficiency & flame temperature

B. Facilitates combustion with lower excess air

C. Provides better control of furnace temperature

D. All A., B. & C.
5345. Vulcanisation of raw rubber makes it__________________?
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A. Tacky

B. Plastic

C. Soft

D. Less elastic
5346. ____________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR?
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A. Resilience

B. Strength

C. Freezing point

D. Percent elongation

5347. Scouring is a finishing operation during the manufacture of fibre, which aims at ______________ of fibres?
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A. Glycol soaking

B. Detergent solution washing

C. Dyeing/colouring

D. Improving the stretchability

5348. Terylene is_________________?
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A. Same as Dacron

B. A polyester

C. Both A. & B.

D. Neither A. nor B.

5349. Density of low density polythene is about ____________ gm/c.c?
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A. 0.91

B. 0.56

C. 0.38

D. 0.81

5350. Polymerisation of poly functional monomers produces polymers having_________________?
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A. Low viscosity

B. Good mechanical strength

C. None of these

D. Low melting point

5351. Thermosetting resins/polymers as compared to thermoplastic ones are ____________________?
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A. Easily reshaped & reused

B. Formed by addition polymerisation only

C. More brittle

D. Soluble in all organic solvents

5352. The bright glow of a combustion process is the characteristic of ______________ temperature oxidation of coal?
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A. Slow & high

B. Fast & slow

C. Slow & low

D. Fast & high
5353. Styrene which is a monomer for the production of polystyrene, is commercially produced by the __________________?
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A. Catalytic dehydrogenation of ethyl benzene

B. Dehydration of ethyl alcohol followed by hydrogenation

C. Reacting ethylene oxide with acetaldehyde

D. Fermentation of starch

5354. Combustion reaction of fuels is a/an ______________ reaction?
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A. Auto catalytic

B. None of these

C. Endothermic

D. Exothermic
5355. A coal having high volatile matter content will ________________?
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A. None of these

B. Have a very high calorific value

C. Burn with a small non-smoky flame

D. Give less yield of tar and gas on carbonisation

5356. Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser ?
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A. Stearic acid estors

B. Tricresyl phosphate

C. Esters of phthalic acid

D. Ethylene glycol
5357. Polycondensation reaction of polymerisation ___________________?
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A. Does not produce linear polymers

B. Produces only thermoplastic material

C. Produces epoxy polymers

D. Does not need any catalyst

5358. In condensation polymerisation as compared to addition polymerisation____________________?
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A. The monomers contain two functional groups

B. The monomers are unsaturated compounds

C. Generally only one monomer is involved

D. No co-product is lost

5359. The fuel ratio of a coal is__________________?
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A. The ratio of its percentage of fixed carbon to that of volatile matter

B. Helpful in estimation of its rank

C. Both A. and B.

D. Neither A. nor B.

5360. Buna-S is also called____________________?
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A. Teflon

B. Polyurethane

C. Bakelite

D. SBR