A flame is a region where combustion of fuel takes place.
Substances which vapourise during burning produce flames. E.g. kerosene, wax etc. Substances which do not vapourise during burning do not produce flames. E.g. coal, charcoal etc. The colour of flame depends on: Temperature, amount of air available, nature of the substance burning.
Luminous Flame |
Non Luminous Flame |
1. Give yellow flame |
1. Give blue color flame |
2. Emits lot of light |
2. Emit very little light |
3. Observed when there is insufficient oxygen or incomplete combustion |
3. Observed when there is sufficient amount oxygen available |
4. Temperature is less and leaves behind black soot and other residue. |
4. Leave no residues behind |
Non Luminous flame leaves _________ residue behind.
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Right Option : D | |||
View Explanation |
Total amount of heat produced by a fuel having calorific value of 20 kJ/kg was found to be 50,000 Joules. How much fuel was burnt ?
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Right Option : D | |||
View Explanation |
Flame produced due to incomplete combustion is called as ________________________ | |||
Right Option : A | |||
View Explanation |
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