Fuels and Combustion

241.Low temperature carbonisation of coal takes place at _________ °C.

1. 300
2. 1100
3. 700
4. 150

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242.Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

1. It contains large amount of volatile matter
2. It is stored in tall heaps
3. Smaller fines are stored in large quantity
4. All (A), (B) and (C)

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243.Low temperature oxidation of coal during storage does not decrease its

1. Oxygen content
2. Caking power
3. Calorific value
4. None of these

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244.Low temperature oxidation of coal is accelerated by the

1. Storage in large heaps
2. Storage in compressed piles
3. Absence of porous or friable particles
4. All (A), (B) and (C)

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245.Low temperature oxidation of coal resulting from bad storage conditions does not decrease its

1. Caking power
2. Calorific value
3. Hydrogen content
4. Oxygen content

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246.Low temperature oxidation of stored coal results in the

1. Decrease in its caking power & calorific value
2. Decrease in its carbon & hydrogen content
3. Increase in its oxygen content
4. All (A), (B) and (A)

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247.Lurgi coal gasifier is a pressurised _________ bed reactor.

1. Moving
2. Fixed
3. Fluidised
4. Entrained

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248.Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces

1. Higher amount of methane
2. Lower amount of hydrogen
3. Both (A) and (B)
4. Higher amount of both methane and hydrogen

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249.Main component of sewage gas produced during anaerobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

1. H₂
2. CH₄
3. CO₂
4. N₂

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250.Main constituent of natural gas is

1. CH₄ (upto 90%)
2. C₂H₆
3. C₃H₈
4. H₂

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