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Fuels and Combustion

Fuels and Combustion
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.

2.5
10
0.5
20

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Fuels and Combustion
Which of the following has the highest flame velocity?

CH₄
H₂
C₂H₆
CO

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Fuels and Combustion
'Mixed gas' used in steel plants is a mixture of

F. gas and coke oven gas
Coke oven gas and L.P.G
Blast furnace gas and naphtha vapor
Coke oven gas and converter gas

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Fuels and Combustion
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its

Sulphur content is lower
Emissivity factor is higher
All of these
Flue gas has lower dew point thereby facilitating more waste heat recovery

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Fuels and Combustion
__________ of the coal is the basis for Seylor's coal classification.

Caking index
Ultimate analysis
Calorific value
Proximate analysis

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Fuels and Combustion
Steam is intermittently admitted into the fuel bed during the production of producer gas to

Increase the gas production rate
Convert CO to CO₂
Minimise the chances of clinker formation
Increase the combustion rate

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