Chemical Engineering - Fuels and Combustion

1. 

For every 10% increase in the excess air; the fuel consumption increases by __________ percent.

A. 0.1
B. 2
C. 5
D. 10

Answer: Option A

Explanation:

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2. 

Fusion point of coal ash increases with increase in its __________ content.

A. iron sulphate
B. iron silicate
C. lime and magnesia
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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3. 

Pick out the wrong statement.

A. Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal.
B. Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel.
C. Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing.
D. none of these.

Answer: Option D

Explanation:

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4. 

Dry air required to burn 1 kg of carbon completely may be around __________ kg.

A. 11
B. 2
C. 20
D. 38

Answer: Option A

Explanation:

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5. 

Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

A. H2
B. CH4
C. CO2
D. N2

Answer: Option B

Explanation:

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