Chemical Engineering - Fuels and Combustion

41. 

Pick out the wrong statement.

A. Cokes of high reactivity are obtained from weakly coking coals.
B. Cokes of high reactivity are obtained from strongly coking coals.
C. Reactivity of coke is inversely proportional to its absolute density.
D. Abrasion index of the coke is a measure of its hardness.

Answer: Option B

Explanation:

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42. 

Which of the following has the highest gross calorific value ?

A. Blast furnace gas
B. Coke oven gas
C. Carburetted water gas
D. Oil refinery gas

Answer: Option D

Explanation:

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43. 

A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

A. presence of large quantity of hydrogen in the fuel.
B. low calorific value of the fuel.
C. high sulphur content in the fuel.
D. lack of thorough mixing of fuel with air.

Answer: Option D

Explanation:

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44. 

Efficient burning of anthracite coal requires

A. low preheat of air.
B. fine grinding.
C. high excess air.
D. all (a), (b) and (c).

Answer: Option B

Explanation:

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45. 

C/H ratio is the minimum in case of

A. furnace oil
B. natural gas
C. coal
D. naphtha

Answer: Option B

Explanation:

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