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Chemical Engineering - Fuels and Combustion

Exercise : Fuels and Combustion - Section 2
16.
High ash coals
are soft & friable (poor strength and size stability).
require longer time of carbonisation as ash offers resistance to heat transfer.
produce larger quantity of coke oven gas.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
Which of the following is not a by-product fuel ?
Pitch
Blast furnace gas
Petrol
Refinery gas
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Preheating of combustion air is done to
increase the adiabatic flame temperature.
increase the calorific value of the fuel.
complete the combustion of fuel.
reduce its requirement for effecting the complete combustion.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Gross heating value of coal is __________ the net heating value.
higher than
lower than
same as
either (a) or (b); depends on the type of coal
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Anthracite can be used for
recarbonising steel.
making carbon electrodes;
blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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