Chemical Engineering - Fuels and Combustion

11. 

Orsat apparatus is meant for

A. gravimetric analysis of flue gas.
B. finding out combustion efficiency.
C. direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride.
D. none of these.

Answer: Option D

Explanation:

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12. 

Pick out the wrong statement.

A. High concentration of oxygen in flue gas means high stack loss.
B. Gaseous fuels require the least % excess air for complete combustion.
C. The ratio of fixed carbon to volatile matter percentage in coal is called its 'fuel ratio'.
D. Calorific value of natural gas is more than that of LPG.

Answer: Option D

Explanation:

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13. 

Compound coke ovens are those which can be heated by

A. both steam and electrical power.
B. lean gas (e.g., B.F. gas).
C. rich gas (e.g., coke oven gas).
D. both (b) and (c).

Answer: Option D

Explanation:

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14. 

Assam coals suffers mainly from the disadvantage of high __________ content.

A. ash
B. volatile matter
C. sulphur (4-6%)
D. moisture

Answer: Option C

Explanation:

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15. 

Preheating of coal charge for the coke ovens reduces the

A. time of carbonisation.
B. yield of gas and tar.
C. fuel consumption in coking.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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