Fuels and Combustion

251.Main constituent of the gas produced from a gobar gas plant is

1. CO₂
2. CH₄
3. H₂
4. CO

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252.Main constituents of Benzol are

1. Benzene, toluene & xylene
2. Tar & creosote
3. Ammonia & phenol
4. Anthracene & phenol

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253.Main constituents of purified Lurgi gas are

1. H₂, C_mH_n & CO₂
2. CO, H₂ & CH₄
3. CO₂, O₂ & CO
4. N₂, H₂ & CO₂

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254.Main use of hard coke produced by high temperature carbonisation is in the

1. Iron blast furnace
2. Cupola in foundries
3. Sinter making
4. Domestic ovens

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255.Main use of soft coke is as _________ fuel.

1. Domestic
2. Blast furnace
3. Foundry
4. None of these

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256.Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called

1. Back draughting
2. Banking
3. Under pressurising
4. None of these

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257.Mineral matter content (M) and ash content (A) in coal are approximately related as

1. M = 1.1A
2. M = A
3. M = 1.5A
4. M = 2A

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258.Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as

1. M = 1.8 A
2. M = 0.5 A
3. M = 1.1 A
4. M = A

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259.Moisture loss is determined by the

1. Humidity of combustion air
2. Moisture content of fuel
3. Both (A) and (B)
4. The water formed by combustion reaction

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260.Mott and Wheeler test is conducted on coke to find its

1. Reactivity with O₂
2. Abradability
3. Phosphorus content
4. Volatile matter content

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261.Naphthalene is removed from coke oven gas by

1. Scrubbing with wash oil (a petroleum product)
2. Adsorbing on bog iron bed
3. Absorbing in vetro-coke solution
4. None of these

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