chemical engineering MCQs – Page 267

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 Review each marked answer and report any item that may be outdated or unclear.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

5321. In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the _____________ fibres?
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A. Polyvinyl acetate

B. Acrylic

C. Saturated polyester

D. Viscose rayon

5322. Which of the following fuels is the best for burning on chain grate stoker ?
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A. Caking coal

B. Coking coal

C. Pulverised coal

D. Non-caking coal

5323. Branched chain polymers compared to linear polymers have higher ____________________?
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A. Tensile strength

B. Degree of irregularity in atomic packing

C. Melting point

D. Density

5324. With increase in C/H ratio of a fuel, the amount of CO2 formed on its complete combustion____________________?
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A. Increases

B. Either A. or B., depends on other factors

C. Remain same

D. Decreases

5325. Which of the following is not a polymer of two monomers ?
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A. SBR

B. Teflon

C. Bakelite

D. None of these

5326. _____________ polythene is most prone to stress-cracking ?
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A. Cross-linked

B. Low density

C. High density

D. Linear low density

5327. Micum Index of a coke is a measure of its___________________?
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A. Bulk density

B. Hardness & strength

C. Porosity

D. Reactivity

5328. Which of the following polymers are produced by employing all bulk polymerisation, solution polymerisation & suspension polymerisation technique of addition (chain) polymerisation ?
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A. Epoxy resin

B. PTFE

C. Bakelite

D. PVC

5329. Nitrogen present in the flue gas is determined in the Orsat apparatus by absorbing it in_____________________?
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A. KOH

B. None of these

C. Pyrogallol solution

D. Ammoniacal cuprous chloride

5330. Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher __________________?
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A. Higher C/H ratio

B. Sulphur content

C. Calorific value

D. Difference in gross & net calorific value

5331. Vinyl flooring is done using _____________ sheets?
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A. Polythene

B. Polyvinyl acetate

C. PVC

D. Polypropylene

5332. Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800 ?
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A. 51600

B. 50800

C. 50000

D. 49200

5333. Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their________________?
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A. Polymerisation mechanism

B. Resistance to heat

C. Molecular sizes

D. wer: Option B

E. Magnitude of intermolecular forces

5334. The only natural thermoplastic resin, which is a product of animal life is ____________________?
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A. Amber

B. Rosin

C. Copal

D. Shellac

5335. Polyvinyl acetate is never used for making_________________?
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A. Adhesives

B. Fibres

C. Moulded articles

D. All A., B. & C.

5336. The repeating units of PTFE are___________________?
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A. FClC = CF2

B. F3 C-CF3

C. F2 C = CF2

D. Cl2CH-CH3

5337. Polyurethane cannot be used to make____________________?
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A. Coating and adhesive

B. Fibre reinforced plastic (FRP)

C. Thermal insulation in refrigerator

D. Automobile cushion

5338. Most of the fibre forming polymers are crystalline in nature, one of the exceptions being ______________ which is amorphous in nature?
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A. Polyester

B. Polyacrylonitrile

C. Polypropylene

D. Nylon

5339. Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding_________________?
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A. Nitro cellulose

B. None of these

C. Camphor

D. Glycerol

5340. Polypropylene is preferred to polythene, because the former is ____________________?
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A. Non-inflammable

B. Harder

C. Stronger

D. Both B. & C.

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