Fuels and Combustion

411.Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?

1. Ammonium sulphate
2. Ammonium nitrate
3. Ammonium phosphate
4. None of these

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412.Which of the following fuel gases has the highest calorific value?

1. Natural gas
2. Coal bed methane (CBM)
3. Liquefied petroleum gas (LPG)
4. Sewage gas

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413.Which of the following fuel gases is heavier than air?

1. Blast furnace gas
2. Coke oven gas
3. Natural gas
4. Water gas

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414.Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas?

1. Blast furnace gas
2. Natural gas
3. Producer gas
4. Water gas

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415.Which of the following fuels has the highest calorific value per unit mass (kcal/kg)?

1. Coal
2. Kerosene
3. Natural gas
4. Furnace oil

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416.Which of the following fuels is generally not used in thermal power plant boiler firing?

1. Furnace oil, light diesel oil and tar/PCM
2. Pulverised coking coal
3. Coal middling from washeries
4. B.F. gas, coke oven gas and L.D. converter gas

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417.Which of the following fuels is the best for burning on chain grate stoker?

1. Non-caking coal
2. Caking coal
3. Coking coal
4. Pulverised coal

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418.Which of the following gaseous fuels has the highest net calorific value (kcal/Nm³)?

1. Producer gas
2. Carburetted water gas
3. Natural gas
4. Liquefied petroleum gas

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419.Which of the following gaseous fuels has the lowest calorific value?

1. Gobar gas
2. Refinery gas
3. Converter gas
4. Blast furnace gas

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420.Which of the following gaseous fuels is likely to have the highest gross calorific value?

1. Sewage gas
2. LPG
3. Producer gas
4. Natural gas

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