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Fuels and Combustion

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

Producer gas
LPG
Natural gas
Sewage gas

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Fuels and Combustion
Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).

3500
150
1500
5000

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Fuels and Combustion
Pulverised coal used in boiler firing need not have

Less moisture content
Lower ash content
High bulk density
High fusion point of its ash

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Fuels and Combustion
Which is the heaviest fuel gas out of the following?

Carburetted water gas
Blast furnace gas
Coke oven gas
Water gas

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

Naphtha
Coal
Furnace oil
Natural gas

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Fuels and Combustion
Natural draft created by the chimney depends upon

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

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