chemical engineering Mcqs
5301. Thermosetting materials_________________?
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A. Are solvent soluble

B. Soften on application of heat

C. Are cross-linked molecules

D. None of these

5302. High rate of heating of coke ovens____________________?
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A. May damage its walls due to abrupt excessive swelling of coal

B. None of these

C. Increases the time of carbonisation

D. Produces larger size coke

5304. Nylon-66 is a polyamide of __________________?
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A. Hexamethylene diamine and adipic acid

B. Vinyl chloride and formaldehyde

C. None of these

D. Adipic acid and methyl amine

5305. Which of the following is not an elastomer ?
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A. Neoprene

B. None of these

C. Nitrile-butadiene

D. Polyisoprene

5306. Starting material for the production of SBR is ____________________?
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A. Ethyl alcohol

B. Ethylene

C. Both A. & B.

D. Neither A. nor B.

5307. In nylon-6, the number 6 represents the total number of_________________?
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A. Hydrogen atoms in the ring

B. Nitrogen atoms in the ring

C. Carbon atoms in the ring

D. Carbon atoms in the linear polymer chain
5315. Which of the following is not a natural polymer ?
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A. Polysaccharides

B. Polyisoprene

C. Nucleic acids e.g. RNA and DNA

D. Polyurethane
5318. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in___________________?
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A. Fine sizes without the presence of any lump

B. Closed space without any ventilation facility

C. Shallow and small piles

D. Large heaps with small surface to volume ratio

5320. In general, the limit of inflammability/explosion limit of fuel gases is widened by the__________________?
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A. Increase in temperature (i.e. preheating)

B. Use of pure oxygen for combustion instead of air

C. Increase in gas pressure

D. All A., B. & C.
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

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

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

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
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

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
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.
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.

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