Chemical Engineering - Fuels and Combustion

6. 

Fixed carbon in coal is defined as

A. that present in volatile matters.
B. the total quantity of carbon present in the coal.
C. hundred minus the percentage of volatile matter, ash and moisture.
D. the one which is present in the residue after combustion.

Answer: Option C

Explanation:

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7. 

Which of the following fuels has the highest calorific value per unit mass (kcal/kg) ?

A. Coal
B. Kerosene
C. Natural gas
D. Furnace oil

Answer: Option D

Explanation:

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8. 

With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

A. hydrogen
B. methane
C. unsaturated hydrocarbons
D. all (a), (b) and (c)

Answer: Option A

Explanation:

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9. 

During its calorific value determination by bomb calorimeter, coal is combusted by

A. air
B. oxygen
C. oxygen enriched air
D. none of these

Answer: Option B

Explanation:

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10. 

Abel apparatus is used for those oils, whose flash points are___°F.

A. <120
B. >120
C. >280
D. 300-600

Answer: Option A

Explanation:

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