chemical engineering MCQs – Page 276

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 Review each marked answer and report any item that may be outdated or unclear.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
5501. Rexine (also called artificial leather), which is used for making table cover, automobile seat cover, shoes etc. is made by coating thick cloth with molten_______________?
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A. Bakelite

B. PVC

C. Teflon

D. SBR

5502. Incomplete combustion of a fuel is characterised by the high _______________ in the flue gas?
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A. Carbon monoxide

B. Temperature

C. Oxygen

D. Smoke

5503. Hot drink (e.g., tea) cups are usually made of _____________________?
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A. Polythene

B. Polystyrene

C. Polypropylene

D. PVC

5504. _____________ is a homopolymer?
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A. Bakelite

B. Nylon-66

C. Neoprene

D. Terylene

5505. Diphenylamine is added to rubber to_________________?
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A. Vulcanise it

B. Protect it from deterioration on exposure to air

C. Make it thermosetting

D. Make it non-inflammable

5506. Vulcanisation of rubber does not increase its__________________?
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A. Softness

B. Oxidation resistance

C. Weight & strength

D. Elasticity & water solubility

5507. Visco-elastic behaviour exhibited by plastics is a ______________ like behaviour?
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A. Solid

B. Neither solid nor liquid

C. Combination of solid & liquid

D. Liquid

5508. Highly caking coals_____________________?
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A. Produce weak coke

B. Produce strong coke

C. May damage the coke oven walls during carbonisation

D. Both B. and C.
5509. Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m2. Which of the following polymers has the maximum film elongation (of the order of 100%) ?
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A. Cellulose acetate

B. Water impermeable cellophane

C. Teflon

D. Polythene
5510. Low temperature oxidation of stored coal results in the________________?
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A. All A., B. and A.

B. Increase in its oxygen content

C. Decrease in its caking power & calorific value

D. Decrease in its carbon & hydrogen content

5511. Which of the following petrographic constituents of coal is non-coking ?
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A. Clarain

B. Fussain

C. Durain

D. Vitrain

5512. Oxygen required for theoretically complete combustion of 1 Nm3 methane is ______________ Nm3?
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A. 4

B. 2

C. 1

D. 6

5513. __________ is used as jet engine fuel ?
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A. Diesel

B. Kerosene

C. Petrol

D. LPG

5514. Which of the following will be unsuitable for dust cleaning from flue gas at 400C from a pulverised coal fired boiler ?
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A. Multicyclones

B. Wet scrubber

C. Hydrocyclones

D. Bag filter
5515. Which of the following is the most poisonous gas ?
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A. L.D. converter gas

B. Coke oven gas

C. Producer gas

D. Blast furnace gas

5516. Which of the following will generate maximum volume of product of complete combustion (Nm3/Nm3 of fuel) ?
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A. Producers gas

B. Natural gas

C. Carburetted water gas

D. Blast furnace gas

5517. A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is_________________?
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A. CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06

B. CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02

C. CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60

D. CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74

5518. In high temperature carbonisation (as compared to low temperature carbonisation) of coal___________________?
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A. All A., B. and C.

B. Tar yield is less but free carbon in tar is more

C. Coke oven gas yield is more

D. Calorific value of coke oven gas is less

5519. During combustion of gaseous fuels, deficiency of air_________________?
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A. Lengthens the flame

B. Does not affect the flame length

C. Tends to shorten the flame

D. Increases the flame temperature

5520. For long flame and easy ignition, the coal used should have_________________?
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A. Low ash

B. High calorific value

C. High ash

D. High volatile matter