Question

0.5 Answer the following in one word each:
1. An example of combustible substance
2. The type of combustion that take place in a sufficient amount of oxygen
3. The region in which combustion of-fuels take place
4.the innermost and coolest part of the flame.
5.the unit of calorific value​

Answer 1

Answer:

1.hydrogen gas

2.One of the types of combustion is Complete Combustion

3.In an internal combustion engine, combustion takes place in cylinder whereas in gas turbines it takes place in Combustion chamber

4.The Innermost zone of a flame is dark or black:It consist of hot,unburnt vapours of the combustible material.It is the least hot part of the flame.It is the coldest part of the flame.

5.kJ/kg.

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Answer 2

Answer:

1. Combustible substances are substances that require little to no heating or increase in pressure to combust. Inorganic examples include phosphorus, magnesium, and hydrogen gas. Organic examples include propane, acetylene, and ethanol. ... Paper, clothes, wood, LPG are all combustible substances.

2. One of the types of combustion is Complete Combustion. Complete combustion occurs in an unlimited supply of air, oxygen in particular. Also, complete combustion is also known as clean combustion. Here the hydrocarbon will burn out completely with the oxygen and leave only two byproducts, water, and carbon dioxide.

3. 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.

4. The Innermost zone of a flame is dark or black: It consists of hot, unburnt vapors of the combustible material. It is the least hot part of the flame. It is the coldest part of the flame. The middle zone of a flame is yellow: It is bright and luminous

5. Calorific value is the amount of energy released or produced when 1 kg of fuel burns or any other substance is burnt in the presence of oxygen and the products of combustion are cooled to STP. Its SI unit is kJ/kg.

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