chemical engineering fuels and combustion MCQs – Page 24

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 Review each marked answer and report any item that may be outdated or unclear.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

461. Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the ________________ of coal?
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A. Gasification

B. None of these

C. Hydrogenation

D. Carbonisation

462. Mineral matter, M and ash percentage A in coal are roughly related as_______________?
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A. M = A

B. M = 0.5 A

C. M = 1.8 A

D. M = 1.1 A

463. Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about________________?
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A. 8800 kcal/m3

B. Same as that of coal middling

C. 25000 kcal/kg

D. 8800 kcal/kg

464. Coal is heated in presence of air to a temperature of about _______________ C, while determining its ash content for proximate analysis?
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A. 950

B. 500

C. 750

D. 1100

465. Pick the odd man out?
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A. Oil gas

B. Briquettes

C. Pitch creosote mixture

D. Wood

466. Orsat apparatus is meant for ___________________?
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A. Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

B. None of these

C. Finding out combustion efficiency

D. Gravimetric analysis of flue gas

467. Flue gas from the heating chamber of by product coke ovens is removed by________________?
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A. Forced draft fan

B. Induced draft fan

C. Natural draft

D. Steam ejector

468. Which of the following constituents of coal is the most important in the production of coke ?
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A. Carbon

B. Moisture

C. Ash

D. Volatiles

469. Which of the following gaseous fuels has the lowest calorific value ?
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A. Gobar gas

B. Blast furnace gas

C. Refinery gas

D. Converter gas

470. Anthracite coal ____________________?
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A. Ignites more easily than bituminous coal

B. Is essentially a coking coal

C. Contains more volatile matter than bituminous coal

D. Burns with short, bluish, yellow-tipped flame producing very little smoke

471. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?
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A. In between 37 & 71%

B. None of these

C. 71%

472. Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about ______________ C?
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A. 30

B. 180

C. 65

D. 120

473. Stack heat losses can be minimised by________________?
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A. Oxygen enrichment of combustion air

B. Controlling the excess air

C. Using low c.v. fuels

D. Maintaining proper draft in the furnace

474. Gross and net calorific value of a fuel will be the same__________________?
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A. If its ash content is zero

B. If its hydrogen/hydrogen compound content is zero

C. If its carbon content is very low

D. Under no circumstances

475. Carbon Content by weight in air dried wood may be about _______________ percent?
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A. 80

B. 10

C. 50

D. 25

476. Pick out the wrong statement ?
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A. Ash is normally removed as fly-ash in Kopper-Totzek process of coal gasification

B. The calorific value (kcal/Nm3) of coke oven gas reduces on removal of hydrogen from it by

C. Percentage of ash in coke produced from medium coking coal is more than that in coal

D. Coal based fertiliser plants in India at Talcher (Orissa) and Ramagundam (A.P) employ

E. ogenic method

F. per-Totzek process of coal gasification

477. Beehive coke oven________________?
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A. Takes 2-3 days for coking of coal but requires no external fuel for heating

B. Produces coke with very poor strength

C. Gives larger yield of coke (around 85%) as compared to by-product ovens

D. Facilitates by-products recovery

478. Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?
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A. It reduces its calorific value tremendously

B. There are chances of explosion during preheating

C. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

D. It reduces its flame temperature tremendously

479. Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of _____________________?
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A. MgO & Na2CO3

B. MgCO3 & NaCl

C. BaSO4 & NaCl

D. MgSO4 & BaCl2

480. Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called_________________?
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A. Under pressurising

B. Back draughting

C. Banking

D. None of these

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