Fuels and Combustion A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that 21% excess air has been used for combustion 21% excess oxygen has been used for combustion Complete combustion of fuel has taken place No excess air has been used for combustion 21% excess air has been used for combustion 21% excess oxygen has been used for combustion Complete combustion of fuel has taken place No excess air has been used for combustion ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The pyragallol solution used in orsat apparatus can absorb Both O₂ and CO Both O₂ and CO₂ Only O₂ All of these Both O₂ and CO Both O₂ and CO₂ Only O₂ All of these ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Coal tar (produced by high temperature carbonisation) is the main source of Paraffins Aromatic compounds Olefins Alphatic compounds Paraffins Aromatic compounds Olefins Alphatic compounds ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Bright coal Contains more than 90% durain Contains more than 90% fussain Contains mainly vitrain & clarain and is generally coking Is non-coking Contains more than 90% durain Contains more than 90% fussain Contains mainly vitrain & clarain and is generally coking Is non-coking ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion A sample of natural gas containing 80% methane (CH₄) and rest nitrogen (N₂) is burnt with 20% excess air. With 80% of the combustibles producing CO₂ and the reminder going to CO, the Orsat analysis in volume percent is CO₂ : 7.42, CO : 1.86, O₂ : 4.64, N₂:86.02 CO₂ : 6.26, CO : 1.56, O₂ : 3.91, H₂O :15.66, N₂ : 72.60 CO₂ : 6.39, CO : 1.60, O₂ : 3.99, H₂O:25.96, N₂:72.06 CO₂ : 7.60, CO : 1.90, O₂ : 4.75, N₂ : 85.74 CO₂ : 7.42, CO : 1.86, O₂ : 4.64, N₂:86.02 CO₂ : 6.26, CO : 1.56, O₂ : 3.91, H₂O :15.66, N₂ : 72.60 CO₂ : 6.39, CO : 1.60, O₂ : 3.99, H₂O:25.96, N₂:72.06 CO₂ : 7.60, CO : 1.90, O₂ : 4.75, N₂ : 85.74 ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion A good quality coal should have Low fusion point of ash None of these High sulphur High ash content Low fusion point of ash None of these High sulphur High ash content ANSWER DOWNLOAD EXAMIANS APP
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