Fuels and Combustion MCQs

469 MCQs — Chemical Engineering MCQs (Page 19 of 47)

Attempt Fuels and Combustion Quiz

Coke ovens in steel plant are heated by ___________________?

A. Electricity
B. Coke oven gas
C. Mixed gas
D. Both b. & c.

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Bomb calorimeter is used for the determination of calorific value of the _____________ fuels?

A. Gaseous
B. Solid
C. Liquid
D. Both b. and c.

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Flue gas discharge velocity through chimney of a big thermal power plant may be around ________________ m/sec?

A. 0.5
B. 10
C. 50
D. 500

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When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?

A. Carbonisation
B. Oxidation
C. Coalification
D. Gasification

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Dust content in raw blast furnace gas is about _______________ gm/Nm3; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use?

A. 15-30
B. 1-2
C. 70-100
D. 150-200

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Rate of low temperature oxidation of coal due to bad storage conditions_______________?

A. Decreases with increase in surface area
B. Does not vary with increase in surface area
C. Is more for low volatile coal compared to high volatile coal
D. Is accelerated by storage in large heaps with small surface to volume ratio

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Which of the following is called “blue gas”?

A. Coke oven gas
B. Water gas
C. Natural gas
D. Producer gas

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Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the___________________?

A. Requirement of large volume combustion chamber
B. Risk of explosion
C. Chances of clinker formation
D. Incomplete combustion of coal

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Use of excess of combustion air in the combustion of fuels results in__________________?

A. Heat losses
B. Long flame
C. Condensation of water vapour from the fuel gas
D. None of these

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Which of the following fuels is generally not used in thermal power plant boiler firing ?

A. Furnace oil, light diesel oil and tar/pcm
B. Pulverised coking coal
C. Coal middling from washeries
D. B.f. gas, coke oven gas and l.d. converter gas

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