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Fuels and Combustion

Fuels and Combustion
Carbon Content by weight in air dried wood may be about __________ percent.

25
50
10
80

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Fuels and Combustion
C/H ratio is the maximum in case of

Coal
Natural gas
Furnace oil
Naphtha

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Fuels and Combustion
Which of the following gaseous fuels is likely to have the highest gross calorific value?

Natural gas
LPG
Producer gas
Sewage gas

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Fuels and Combustion
Which of the following accounts for maximum energy loss in a boiler?

Ash content in the fuel
Incomplete combustion
Unburnt carbon in flue gases
Flue gases

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Fuels and Combustion
Air/gas ratio for complete combustion will be the highest for

LPG
Carburetted water gas
Gobar gas
Coke oven gas

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Fuels and Combustion
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

High oxygen in flue gas
Incomplete combustion
Complete combustion
None of these

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