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Chemical Engineering - Fuels and Combustion

Exercise : Fuels and Combustion - Section 3
6.
Which will have the least volatile matter and hence will be the most difficult to ignite?
Bituminous coal
Coke
Semi-bituminous coal
Aanthracite
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
4
96
20
40
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
As time passes, the calorific value of stored coal
decreases
increases
remains unaltered
may increase or decrease (depends on the method of storage).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
Stack (chimney) height in a big thermal power plant is dictated by the
pollution control aspect.
draught to be created.
limitation of constructional facilities.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
is less liable to spontaneous combustion on storage.
is more difficult to ignite and produces a shorter flame.
requires smaller combustion space and less secondary air.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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