Fuels and Combustion

401.Which is the heaviest fuel gas out of the following?

1. Blast furnace gas
2. Coke oven gas
3. Water gas
4. Carburetted water gas

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402.Which is the most matured coal?

1. Lignite
2. Bituminous
3. Semi-anthracite
4. Anthracite

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403.Which of the following accentuates clinkering trouble on furnace grate burning coal?

1. Low reactivity of carbonised residue containing high proportions of iron & sulphur
2. Low forced draught and fuel bed temperature
3. Thick fire bed and preheated primary air
4. All (A), (B) and (C)

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404.Which of the following accounts for maximum energy loss in a boiler?

1. Flue gases
2. Ash content in the fuel
3. Incomplete combustion
4. Unburnt carbon in flue gases

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405.Which of the following can be made into briquettes without the use of a binder?

1. Lignite
2. Bituminous coal
3. Anthracite coal
4. None of these

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406.Which of the following coal gasification processes will produce gas having maximum methane content?

1. Winkler process
2. Lurgi process
3. Kopper-Totzek process
4. All can produce same methane content

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407.Which of the following coke has the least percentage of ash?

1. Petroleum coke
2. Beehive coke
3. Foundry coke
4. Metallurgical coke

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408.Which of the following combustibles is absent in blast furnace gas?

1. H₂
2. CH₄
3. CO
4. None of these

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409.Which of the following constituents of a fuel does not contribute to its calorific value on combustion?

1. Hydrogen
2. Sulphur
3. Carbon
4. None of these

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410.Which of the following constituents of coal is the most important in the production of coke?

1. Moisture
2. Ash
3. Volatiles
4. Carbon

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