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Chemical Engineering - Fuels and Combustion

Exercise : Fuels and Combustion - Section 8
31.
During coking of coal, the ash content (percentage)
increases
decreases
remains constant
-
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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.
5
10
20
35
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to
minimise its corrosion.
avoid radiation heat loss.
make it look attractive.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
The weathering index of a coal
gives an idea of the fusion temperature of ash.
is related to its calorific value.
is a measure of its size stability, when stored & exposed to weather.
is a measure of its caking tendency.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Bright coal
contains more than 90% durain.
contains more than 90% fussain.
contains mainly vitrain & clarain and is generally coking.
is non-coking.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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