chemical engineering MCQs – Page 287

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 Review each marked answer and report any item that may be outdated or unclear.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
5721. Shatter index of the coke is a measure of its___________________?
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A. Bulk density

B. Reactivity

C. Strength
5722. Which of the following coal gasification processes will produce gas having maximum methane content ?
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A. Lurgi process

B. Kopper-Totzek process

C. Winkler process

D. All can produce same methane content

5723. Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has_________________?
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A. Higher calorific value

B. Lower hydrogen content

C. Both A. and B.

D. Neither A. nor B.
5724. Presence of ______________ in a dry gaseous fuel does not contribute to its calorific value?
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A. Hydrogen

B. Oxygen

C. Carbon

D. Sulphur

5725. Which of the following is not a by-product fuel ?
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A. Producer gas

B. Bagasse

C. Sewage gas

D. Refinery gas

5726. Atomising steam to fuel oil ratio in a burner should be around__________________?
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A. 2.5

B. 0.5

C. 1.5

D. 3.5

5727. Bomb calorimeter is used to determine the (where, GCV Gross Calorific Value. NCV Net Calorific Value.) ?
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A. NCV at constant pressure

B. NCV at constant volume

C. GCV at constant pressure

D. GCV at constant volume
5728. Undercharging of coal in the by-product coke ovens results in ____________________?
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A. No change in the c.v. of coke oven gas

B. Increase in its throughput

C. Increase in the c.v. of coke oven gas

D. Decrease in the c.v. of coke oven gas
5729. The weathering index of a coal________________?
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A. Is a measure of its size stability, when stored & exposed to weather

B. Gives an idea of the fusion temperature of ash

C. Is related to its calorific value

D. Is a measure of its caking tendency

5730. The cooling medium used in dry quenching of coke is___________________?
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A. Phenolic water

B. Carbon dioxide

C. Air

D. Nitrogen
5731. With increase in the temperature of carbonisation of coal ___________________?
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A. pensated by increase in CO & H2 content

B. Methane content in the coke oven gas decreases and carbon monoxide content increases

C. Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not

D. Hydrogen content of coke oven gas increases due to cracking of hydrocarbons

E. All A., B. and C.
5732. Which of the following is called blue gas?
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A. Producer gas

B. Water gas

C. Natural gas

D. Coke oven gas

5733. Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300) may be reduced by about ______________ percent as compared to the use of atmospheric combustion air?
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A. 20

B. 10

C. 35

D. 5

5734. Coal containing large quantity of _______________ are difficult to wash?
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A. Ash

B. Inherent mineral matter

C. Free impurities

D. Volatile matter

5735. In Lurgi coal gasifier___________________?
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A. Low carbon conversion efficiency is achieved

B. Coking coals cannot be used

C. Entrainment of solids is higher

D. Larger quantity of coal can be processed
5736. Pick out the wrong statement ?
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A. Cold SBR is superior as compared to hot SBR

B. None of these

C. Polymerisation temperature can modify the properties of SBR

D. Production of cold SBR employs lower pressure as compared to that of hot SBR

5737. Number of macrocomponents present in coal according to Stopes are ___________________?
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A. Two

B. Six

C. Four

D. Five

5738. Which of the following is not a binder for coal briquetting ?
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A. None of these

B. Coal tar

C. Bitumen

D. Molasses

5739. Calorific value of a typical dry anthracite coal may be around _____________ Kcal/kg?
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A. 15000

B. 4000

C. 8000

D. 1000

5740. Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ?
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A. Fussain

B. Durain

C. Vitrain

D. Clarain