chemical engineering fuels and combustion MCQs – Page 20

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 Review each marked answer and report any item that may be outdated or unclear.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

381. Coal tar (produced by high temperature carbonisation) is the main source of_________________?
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A. Paraffins

B. Olefins

C. Aliphatic compounds

D. Aromatic compounds

382. Deficiency of combustion air during combustion of a gaseous fuel_____________________?
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A. Lengthens the flame

B. Causes heat loss of fuel by its partial combustion

C. Both A. & B.

D. Shortens the flame

383. Ammonia content in raw coke oven gas is about _____________ gm/Nm3?
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A. 5

B. 1

C. 100

D. 50

384. Calorific value of furnace oil is about _______________ Kcal/kg?
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A. 15,000

B. 5,000

C. 10,000

D. 20,000

385. Pulverised coal used in boiler firing need not have____________________?
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A. High fusion point of its ash

B. Less moisture content

C. High bulk density

D. Lower ash content

386. In flue gas analysis by Orsats apparatus, oxygen is absorbed by____________________?
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A. None of these

B. Potassium hydroxide

C. Alkaline pyrogallol solution

D. Cuprous chloride

387. The main advantage of forced draft over natural draft is that____________________?
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A. Smaller height chimney can be used

B. Furnace control is easier

C. All A., B. & C.

D. Combustion of fuel is complete

388. In high temperature carbonisation of coal compared to low temperature carbonisation ?
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A. Calorific value of the coke oven gas is lower

B. H2 content in the coke oven gas is more

C. Aromatic content of tar is low

D. Yield of ammonia is less

389. When the coal is heated in absence of air, it is called its ________________?
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A. Carbonisation

B. Gasification

C. Deoxidation

D. Coalification

390. During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?
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A. Incomplete combustion

B. High oxygen in flue gas

C. None of these

D. Complete combustion

391. Preheating of coal charge for the coke ovens reduces the __________________?
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A. Time of carbonisation

B. All A., B. and C.

C. Yield of gas and tar

D. Fuel consumption in coking

392. Gas yield in the Kopper-Totzek coal gasifier is about ______________ Nm3/ton coal (ash = 35%)?
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A. 3500

B. 5000

C. 150

D. 1500

393. Stack (chimney) height in a big thermal power plant is dictated by the___________________?
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A. Draught to be created

B. None of these

C. Pollution control aspect

D. Limitation of constructional facilities

394. Which of the following has the highest flame speed ?
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A. C2H6

B. H2

C. CH4

D. CO

395. Ratio of primary air to secondary air increases with increase in the rank of coal, because the__________________?
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A. Ratio of fixed carbon to volatile matter increases

B. Calorific value of the coal increases

C. High rank coals have higher amount of volatile matter

D. Oxygen content progressively decreases

396. Gobar gas is produced by the ______________ of cow dung?
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A. Fermentation

B. Oxidation

C. None of these

D. Hydrogenation

397. One kg of carbon for theoretically complete combustion requires ______________ kg of air?
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A. 11.5

B. 0.5

C. 12

D. 23

398. Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the_______________?
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A. Mixing with blast furnace gas

B. Hot scarfing of steel slabs

C. Coke oven battery heating

D. Steel ladle drying

399. Spontaneous combustion of coal on storage results due to___________________?
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A. Inadequate ventilation

B. Storage in large heaps with small surface to volume ratio

C. All A., B. and C.

D. Low temperature oxidation

400. Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around ______________ percent?
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A. 40

B. 20

C. 96

D. 4

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