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Fuels and Combustion

Fuels and Combustion
Largest constituent of coke oven gas is

H₂
N₂
CO₂
CH₄

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Fuels and Combustion
In low temperature carbonisation of coal, the

Volatile matter in coke is zero
Yield of coke oven gas is 290 Nm³ /ton dry coal
Temperature maintained is 700°C
Yield of tar is about 3% of dry coal

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Fuels and Combustion
During combustion of coal on grate, clinker formation is increased by the

Use of preheated primary air
All of these
Low fusion point of ash (< 1100° C)
Use of thick fire bed

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Fuels and Combustion
Main constituent of natural gas is

C₂H₆
CH₄ (upto 90%)
H₂
C₃H₈

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Fuels and Combustion
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm³)?

Carburetted water gas
Natural gas
Liquified petroleum gas
Producer gas

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Fuels and Combustion
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher

Sulphur content
Difference in gross & net calorific value
Calorific value
Higher C/H ratio

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