Fuels and Combustion

451.Which of the following is used for making the explosive „TNT‟?

1. Benzol
2. Toluene
3. Pyridine
4. Cerosote

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452.Which of the following petrographic constituents of coal is non-coking?

1. Vitrain
2. Clarain
3. Durain
4. Fussain

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453.Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?

1. Vitrain
2. Clarain
3. Durain
4. Fussain

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454.Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?

1. 2CO ↔ C + CO₂
2. CO + H₂O ↔ CO₂ + H₂
3. C + H₂O ↔ CO + H₂
4. C + 2H₂O ↔ CO₂ + 2H₂

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455.Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler?

1. Multicyclones
2. Bag filter
3. Wet scrubber
4. Hydrocyclones

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456.Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel)?

1. Carburetted water gas
2. Blast furnace gas
3. Natural gas
4. Producers' gas

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457.Which of the following would require least amount of secondary air for combustion?

1. Coke breeze containing 25% ash and 2% volatile matter
2. Anthracite containing 10% volatile matter and 8% ash
3. Bituminous coal containing 20% ash and 25% volatile matter
4. Semi-bituminous coal containing 25% ash and 20% volatile matter

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458.Which of the following would require maximum amount of % excess air for complete combustion?

1. Coke oven gas
2. Furnace oil
3. Pulverised coal
4. Lump coal (fixed on chain grate)

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459.Which will have the least volatile matter and hence will be the most difficult to ignite?

1. Bituminous coal
2. Coke
3. Semi-bituminous coal
4. Anthracite

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460.While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai, India), the second such plant has been built at

1. Dankuni (West Bengal)
2. Dhanbad
3. Singreni (AP.)
4. Raniganj

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