chemical engineering fuels and combustion MCQs – Page 21

Practise multiple-choice questions from chemical engineering fuels and combustion for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fuels and combustion Mcqs

401. Which of the following is a primary fuel ?
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A. Wood charcoal

B. Gasoline

C. Natural gas

D. Blast furnace coke

402. During combustion of gaseous fuels, deficiency of air_________________?
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A. Increases the flame temperature

B. Tends to shorten the flame

C. Does not affect the flame length

D. Lengthens the flame

403. Fuel can be defined as a substance which produces heat by___________________?
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A. Nuclear fission

B. Combustion

C. Nuclear fusion

D. All A., B. & C.

404. By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of_______________?
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A. None of these

B. Benzol

C. Ammonia

D. Tar

405. Caking index of coal blend used for blast furnace coke making is about_________________?
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A. 22

B. 36

C. 8

D. 12

406. The pyrogallol solution used in Orsat apparatus can absorb_________________?
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A. Only O2

B. Both O2 and CO2

C. Both O2 and CO

D. All CO, CO2, and O2

407. Stoichiometric combustion of 12 kg of carbon requires _____________ of oxygen?
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A. 32 kg

B. 22.4 Nm3

C. All A., B. and C.

D. 1kg mole

408. Fischer-Tropsch method aims at the ______________________?
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A. Synthesis of gasoline (from water gas)

B. None of these

C. Gasification of coal

D. Hydrogenation of coal to produce gasoline

409. Main constituents of purified Lurgi gas are___________________?
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A. H2, CmHn & CO2

B. CO, H2 & CH4

C. CO2, O2 & CO

D. N2, H2 & CO2

410. Kopper-Totzek coal gasifier_________________?
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A. Operate at very high pressure

B. Can give ammonia synthesis gas (H2 + N2)

C. Cannot use coking coal

D. Is a moving bed reactor

411. Washing of coal is done to reduce the_________________?
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A. Inherent impurities

B. Adhering impurities

C. Mineral matter

D. Both B. and C.

412. Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about _____________ C?
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A. 900-1000

B. 400-500

C. 1400-1500

D. 1700-1800

413. _____________ prohibits the use of alcohols directly in petrol engines ?
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A. Low octane number

B. Low calorific value

C. High cost & availability

D. Low flash point

414. Coke oven gas is a better fuel than blast furnace gas, because of its higher________________?
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A. Adiabatic flame temperature

B. Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

C. All A., B. and C.

D. Heat release rate (thus requiring smaller combustion chamber)

415. The calorific value is the highest out of the following for__________________?
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A. Blast furnace gas

B. Coke oven gas

C. Water gas

D. Producer gas

416. Fuel for a fast breeder nuclear reactor is____________________?
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A. Plutonium

B. Radium

C. Neptunium

D. Uranium

417. Moisture loss is determined by the _______________________?
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A. Humidity of combustion air

B. Moisture content of fuel

C. Both A. and B.

D. The water formed by combustion reaction

418. Which of the following fuels has the highest calorific value per unit mass (kcal/kg) ?
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A. Furnace oil

B. Kerosene

C. Natural gas

D. Coal

419. With increase in C/H ratio of a fuel, the dew point of flue gases______________________?
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A. Decreases

B. May increase or decrease; depends on the type of fuel

C. Increases

D. Remain same

420. A coal with high ash content___________________?
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A. Is harder and stronger

B. Has higher calorific value

C. Has low quantity of mineral matter

D. Is not subjected to washing

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