Fuels and Combustion

341.The calorific value of natural gas is about _________ kcal/Nm³.

1. 10000
2. 2500
3. 25000
4. 35000

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342.The calorific value of producer gas is around _________ kcal/Nm³.

1. 1300
2. 500
3. 4500
4. 9000

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343.The catalyst used in shift converter is

1. Nickel
2. Vanadium
3. Silica gel
4. Alumina

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344.The combustion reaction, C + O₂ = CO₂, is

1. Exothermic
2. Endothermic
3. Autocatalytic
4. None of these

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345.The cooling medium used in dry quenching of coke is

1. Nitrogen
2. Air
3. Phenolic water
4. Carbon dioxide

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346.The cuprous chloride used in orsat apparatus can absorb

1. Only CO
2. Both CO and CO₂
3. Both CO and O₂
4. All CO, CO₂, and O₂

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347.The difference between total carbon and fixed carbon of coal will be minimum in case of

1. Lignite
2. Bituminous coal
3. Anthracite
4. High temperature coke (V.M < 0.5%)

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348.The fuel ratio of a coal is

1. The ratio of its percentage of fixed carbon to that of volatile matter
2. Helpful in estimation of its rank
3. Both (A) and (B)
4. Neither (A) nor (B)

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349.The function of secondary combustion air is to

1. Pneumatically convey the pulverised coal
2. Completely burn the volatile matter
3. Burn the lumpy coal
4. None of these

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350.The gas which contributes maximum to the heating value of natural gas is

1. CO
2. CO₂
3. H₂
4. CH₄

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