Chemical Engineering - Fuels and Combustion

41. 

Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.

A. 6
B. 18
C. 28
D. 36

Answer: Option B

Explanation:

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42. 

Which of the following has the least calorific value (kcal/Nm3) ?

A. Blast furnace gas
B. Coke oven gas
C. Sewage gas
D. Natural gas

Answer: Option A

Explanation:

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43. 

Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.

A. hydrogenation
B. gasification
C. carbonisation
D. none of these

Answer: Option A

Explanation:

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44. 

The combustion reaction, C + O2 = CO2, is

A. exothermic
B. endothermic
C. autocatalytic
D. none of these

Answer: Option A

Explanation:

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45. 

For maximum discharge through a chimney, its height should be

A. 200 meters.
B. infinitely long.
C. more than 105.7 metres.
D. equal to the height of the hot gas column producing draught.

Answer: Option D

Explanation:

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