Chemical Engineering - Fuels and Combustion

31. 

During coking of coal, the ash content (percentage)

A. increases
B. decreases
C. remains constant
D. -

Answer: Option A

Explanation:

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32. 

Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.

A. 5
B. 10
C. 20
D. 35

Answer: Option C

Explanation:

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33. 

The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to

A. minimise its corrosion.
B. avoid radiation heat loss.
C. make it look attractive.
D. none of these.

Answer: Option B

Explanation:

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34. 

The weathering index of a coal

A. gives an idea of the fusion temperature of ash.
B. is related to its calorific value.
C. is a measure of its size stability, when stored & exposed to weather.
D. is a measure of its caking tendency.

Answer: Option C

Explanation:

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35. 

Bright coal

A. contains more than 90% durain.
B. contains more than 90% fussain.
C. contains mainly vitrain & clarain and is generally coking.
D. is non-coking.

Answer: Option C

Explanation:

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