Fuels and Combustion

271.Octane number of 2, 2, 4 - trimethyl pentane is

1. 0
2. 100
3. In between 0 and 100
4. More than 100

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272.Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about _________ percent.

1. 5
2. 25
3. 55
4. 75

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273.One kg of carbon for theoretically complete combustion requires _________ kg of air.

1. 11.5
2. 0.5
3. 23
4. 12

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274.Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is

1. 200 °F
2. 200 °C
3. 200 °K
4. 200 °R

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275.Orsat apparatus

1. Gives flue gas analysis on dry basis
2. Determines N₂ in flue gas indirectly
3. Can't determine CO in flue gas, if it is < 0.2%
4. All (A), (B) & (C)

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276.Orsat apparatus is meant for

1. Gravimetric analysis of flue gas
2. Finding out combustion efficiency
3. Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
4. None of these

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277.Out of the following fuels, the difference between gross and net calorific value will be minimum in case of

1. Coke oven gas
2. Water gas
3. Natural gas
4. Blast furnace gas

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278.Out of the following fuels, the difference between the net and gross calorific value is maximum in case of

1. Pitch
2. Fuel oil
3. Blast furnace gas
4. Bituminous coal

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279.Out of the following, which is the most important parameter for the blast furnace grade coke?

1. CSR & CRI
2. Ash content
3. Moisture content
4. Volatile matter content

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280.Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around _________ percent.

1. 4
2. 96
3. 20
4. 40

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