Fuels and Combustion

221.In low temperature carbonisation of coal, the

1. Yield of coke oven gas is 290 Nm³ /ton dry coal
2. Volatile matter in coke is zero
3. Temperature maintained is 700°C
4. Yield of tar is about 3% of dry coal

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222.In Lurgi coal gasifier,

1. Coking coals cannot be used
2. Low carbon conversion efficiency is achieved
3. Entrainment of solids is higher
4. Larger quantity of coal can be processed

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223.In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing

1. CO
2. CO₂
3. O₂
4. H₂O

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224.Incomplete combustion of a fuel is characterised by the high _________ in the flue gas.

1. Smoke
2. Temperature
3. Oxygen
4. Carbon monoxide

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225.Incomplete combustion of fuel in the furnace is judged by high _________ of the flue gases.

1. CO content
2. Dew point
3. CO₂ content
4. O₂ content

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226.Increase in ash content of blast furnace coke

1. Reduces its consumption in the furnace
2. Increases its consumption in the furnace
3. Does not affect its consumption in the furnace
4. Decreases its hardness and abrasion resistance

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227.Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around _________ atm.

1. 43954
2. 25-30
3. 60-65
4. 95-100

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228.Insitu theory and drift theory are related to the

1. Origin of petroleum oil
2. Origin of coal
3. Coalification
4. Variation of coal quality with depth

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229.Ionisation potential applied across the electrodes of electrostatic tar precipitator is around

1. 230 V AC
2. 60 KV AC
3. 230 V DC
4. 60 KV DC

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230.Junker's calorimeter is used to determine the calorific value of

1. Pulverised coal
2. Gaseous fuels
3. Fuel oil
4. None of these

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