chemical engineering MCQs – Page 384

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 Review each marked answer and report any item that may be outdated or unclear.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

7661. Triple superphosphate is chemically represented as_____________________?
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A. Ca(H2PO4)2

B. Ca(PO3)2

C. 3Ca3(PO4)2

D. CaF2.3Ca3(PO4)2

7662. Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium___________________?
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A. Silicate

B. Bicarbonate

C. Carbonate

D. Phosphate

7663. Reaction of dilute sulphuric acid with phosphate rock produces ____________________?
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A. Phosphoric acid

B. Triple superphosphate

C. Superphosphate

D. Gypsum

7664. Naphtha in a fertiliser plant is used as a source of___________________?
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A. Fuel

B. H2

C. O2

D. N2

7665. Which of the following is the most widely used disinfectant in water treatment ?
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A. Coagulation

B. Cation exchanger

C. Irradiation of water by ultraviolet light

D. Chlorine

7666. Which of the following is not a practical method of low level radioactive waste disposal ?
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A. Disposing off in rivers & oceans

B. Dilution with inert material

C. Discharging to atmosphere through tall stacks after dilution

D. Filling in steel crates and shooting it off out of earths gravity

7667. Ringelmann chart No. 2 corresponds to _______________ percent black smoke?
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A. 20

B. 10

C. 40

D. 80

7668. Base suspension fertiliser essentially contains___________________?
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A. 43% N2 and 13% K2O

B. 13% N2 and 43% P2O5

C. 43% N2 and 13% P2O5

D. 43% K2O and 43% P2O5

7669. Catalytic ammonia synthesis reaction as in Habers process is_________________?
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A. Endothermic

B. None of these

C. Exothermic

D. Irreversible

7670. Electric process as compared to wet process (for the manufacture of phosphoric acid) ?
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A. Is used less frequently

B. Produces a valuable by-product called gypsum

C. Is weak acid process

D. Can use only high grade phosphate rock

7671. Iron is not used alone as a catalyst in ammonia synthesis, because___________________?
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A. None of these

B. It gets oxidised above 500C

C. It decomposes ammonia

D. Its activity declines rapidly, if heated to above 520C

7672. Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in__________________?
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A. Low bulk density product

B. Biuret formation

C. Substantially wet non-flowing and sticky product

D. Non-spherical prills

7673. Which nutrient in fertiliser makes the plant stems stronger and increases branching ?
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A. Phosphorous

B. Calcium

C. Nitrogen

D. Potassium

7674. Raw materials for urea production are _________________?
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A. HNO3 and CaCO3

B. NH3 and CO

C. CO2, H2 and N2

D. CO2 and N2

7675. Lower temperature and large excess of ammonia in urea melt__________________?
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A. Increases biuret formation

B. Does not effect biuret formation

C. Decreases biuret formation

D. Is undesirable

7676. Potassic fertilisers__________________?
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A. None of these

B. Are useful during early stage of the plant growth

C. Help in development of starches of potatoes and grain

D. Stimulate early growth and accelerate seeding

7677. Optimum reaction temperature in steam reforming of naphtha is ______________ C?
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A. 100-200

B. 700 1000

C. 1500-1700

D. 300 450

7678. Catalyst used in desulphurisation of naphtha is____________________?
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A. Nickel

B. Pt-Rh

C. Silica gel

D. Co-Mo

7679. In an ammonia plant, the purge off is essential to___________________?
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A. Remove uncondensed ammonia vapour

B. Remove excess poisonous gases

C. Maintain H2 : N2 ratio at 3 :1

D. Maintain inert gas concentration within a limit

7680. Reaction of calcium Fluorapatite with sulphuric acid produces ___________________?
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A. Ortho-phosphoric acid

B. Red phosphorous

C. Simple superphosphate

D. Triple superphosphate

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