Q1. What are the three essential requirements for combustion? Q2. Which part of a flame does a goldsmith blow for melting gold and silver? Q3. Why is sodium kept immersed in kerosene? Q4. What is rapid combustion? Q5. Give two examples each of solid fuels, liquid fuels and gaseous fuels. Q6. 60 kg of fuel was completely burnt for an experiment. The amount of heat energy was found to be 1,80,000 kJ. Calculate the calorific value of the fuel. Q7. Mention any three characteristics of a good fuel.
Answers
Answer:
Explanation:
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.
2. Combustion And Flame. Goldsmiths blow the outermost zone of a flame with a metallic blow pipe for melting gold and silver.
3. Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.
4. Rapid combustion is a form of combustion in which large amounts of heat and light energy are released. This often occurs as a fire. This is used in a form of machinery, such as internal combustion engines, and in thermobaric weapons.
5. here u go:
- Solid fuel: wood , coal
- Liquid fuel : kerosene , petrol
- Gaseous fuel: LPG, CNG
6. Calorific value = Amount of Heat Energy / Amount of fuel
= 180000 kJ / 60 kg
= 3000 kJ/kg
7. here u go :
- It should possess high calorific value.
- It should have proper ignition temperature. ...
- It should not produce poisonous products during combustion. ...
- It should have moderate rate of combustion.
- Combustion should be easily controllable i.e., combustion of fuel should be easy to start or stop as and when required.
Answer:
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