Question

. Short answer questions.
1. Give three conditions which are necessary for combustion.
2. What is calorific value of a fuel?
3. Differentiate between luminous and non-luminous zone of a candle flame.
4. What do you mean by ignition temperature of a substance?
5. How does combustion of fuels cause global warming?
6. What is SPM? Explain.
7. What is greenhouse effect? Explain.
8. What is unleaded petrol? What is its advantage.
9. What are secondary fuels? Give examples.
t. Why the lowermost zone of flame is called dark zone?​

Answer 1

Answer:

1. Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.

Explanation:

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