Chemical Engineering - Fuels and Combustion

41. 

Which of the following has the highest calorific value ?

A. Lignite
B. Sub-bituminous coal
C. Anthracite
D. Peat

Answer: Option C

Explanation:

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42. 

__________ present in coal is not determined in its ultimate analysis.

A. Fixed carbon
B. Total carbon
C. Hydrogen
D. Nitrogen.

Answer: Option A

Explanation:

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43. 

The calorific value of L.D. converter gas is about __________ Kcal/Nm3 .

A. 1800
B. 800
C. 4500
D. 10000

Answer: Option A

Explanation:

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44. 

__________ prohibits the use of alcohols directly in petrol engines.

A. Low octane number
B. High cost & availability
C. Low flash point
D. Low calorific value

Answer: Option B

Explanation:

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45. 

Higher fuel combustion efficiency can not be achieved by

A. preheating of fuel gases & combustion air.
B. reducing sulphur content in the fuel.
C. adopting proper fuel firing technique & fuel preparation.
D. supplying correct amount of combustion air.

Answer: Option B

Explanation:

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