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Fuels and Combustion

Fuels and Combustion
Natural draft created by the chimney depends upon

Both A & B
Temperature of the flue gas
Neither A nor B
Its height

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Fuels and Combustion
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

950
1100
500
750

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Fuels and Combustion
Washing of coal decreases its

Caking index
Both B and C
Mineral matter content
Ash content

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Fuels and Combustion
Which of the following has the least calorific value (kcal/Nm³) ?

Blast furnace gas
Coke oven gas
Sewage gas
Natural gas

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Fuels and Combustion
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

50
5000
10000
1000

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Fuels and Combustion
The most matured coal out of the following is

Bituminous
Semi-anthracite
Sub-bituminous
Lignite

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