Fuels and Combustion

191.High ash containing coke

1. Produces more slag when used in the blast furnace
2. Has poor strength and abrasion resistance
3. Is desirable in producer gas manufacture
4. None of these

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192.High excess air in combustion of fuels results in

1. Increased fuel consumption
2. Incomplete combustion
3. Smoky flame
4. None of these

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193.High pressure coal gasification is employed in _________ process.

1. Lurgi
2. Kopper-Totzek
3. Winkler
4. None of these

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194.High rate of heating of coke ovens

1. May damage its walls due to abrupt excessive swelling of coal
2. Produces larger size coke
3. Increases the time of carbonisation
4. None of these

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195.High sulphur (4-6%) coal in India are found in

1. Assam
2. Andhra Pradesh
3. Bengal
4. Madhya Pradesh

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196.High sulphur content in a fuel _________ of the flue gases.

1. Decreases the dew point
2. Increases the dew point
3. Reduces the combustion efficiency by limiting the permissible temperature reduction
4. Both (B) and (C)

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197.High temperature carbonisation of coal produces

1. Inferior coke compared to low temperature carbonisation
2. Less of gases compared to liquid products
3. Large quantity of tar compared to low temperature carbonisation
4. None of these

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198.High temperature carbonisation of coal takes place at _________ °C.

1. 2000
2. 600
3. 1100
4. 1600

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199.High temperature in gasification of coal favours

1. High production of CO₂
2. Low production of CO₂
3. High production of CO
4. Both (B) and (C)

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200.Higher efficiency in the combustion of solid fuel cannot be achieved by

1. Proper fuel preparation
2. Keeping the flue gas exhaust temperature very high
3. Adopting efficient-fuel firing technique & equipment
4. Supplying correct quantity of combustion air

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