Fuels and Combustion

441.Which of the following is not a micro component present in coal?

1. Micrinite
2. Clarain
3. Fusinite
4. Liptinite

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442.Which of the following is not applicable to fluidised bed combustion of coal?

1. It cannot burn low grade coal
2. It achieves higher fuel combustion efficiency
3. Less heat transfer surface area is required in boilers
4. None of these

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443.Which of the following is not endothermic?

1. Cracking
2. Reforming
3. Gasification
4. Partial oxidation

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444.Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

1. Calorific value of the fuel
2. Flame temperature achieved
3. Speed of combustion of fuel
4. Heat transfer rate to the stock in the furnace

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445.Which of the following is not used as a binder in coal briquetting?

1. Tar
2. Molasses
3. Pitch
4. Line

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446.Which of the following is the maximum coal producing state in India?

1. Orissa
2. West Bengal
3. Jharkhand
4. Assam

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447.Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

1. Ash disposal problem
2. Excessive fly-ash discharge from the stack
3. High power consumption in its transportation
4. Erosion of induced draft fan blades

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448.Which of the following is the most poisonous gas?

1. Coke oven gas
2. Producer gas
3. Blast furnace gas
4. L.D. converter gas

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449.Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O)?

1. Blast furnace coke
2. Low temperature coke
3. Anthracite coal
4. Sub-bituminous coal

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450.Which of the following is unsuitable fuel for producer gas manufacture?

1. Coke
2. Anthracite
3. Coal having low fusion point of its ash
4. Coal having high fusion point of its ash

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