Q9. Long Answers type questions (Any 3) a) How is coke obtained from coal? State three important uses of coke b) What is the calorific value of a fuel? Calorific value of cow dung is 7000 Kilojoules/Kg how much cow dung cake are required to produce heat energy of 35000 KJ. c) How is pressure related to force? Why is a tank made to move over a wide Steel belt? d) How has the use of CNG motor vehicles reduced in pollution in the big cities? Explain. nlod dinarm (any 21
Answers
Explanation:
The sources of heat energy for domestic and industrial purposes are mainly wood, charcoal, petrol, kerosene, etc. These substances are called fuels. A good fuel is one which is readily available. It is cheap. It burns easily in air at a moderate rate. It produces a large amount of heat. It does not leave behind any undersirable substances.
There is probably no fuel that could be considered as an ideal fuel. We should look for a fuel which fulfils most of the requirements for a particular use. Fuels differ in their cost. Some fuels are cheaper than others.
Types of Fuels
Fuels can be divided into three main categories
1) Solid fuels
2) Liquid fuels
3) Gaseous fuels
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Answer:
1. Coke is obtained by destructive distillation of charcoal or coal in the furnace Destructive distillation is the chemical process involving the decomposition of coal or charcoal by heating to a high temperature in the absence of air or in the presence of limited amounts of oxygen.
*Some important uses of coke are,
Coke is used as a domestic fuel.
Coke is used as a reducing agent in metallurgical processes.
Coke is used for producing fuel gases.
Coke is used for producing carbides
2. The calorific value of food refers to the total amount of energy that a human body can produce during metabolism, which is measured in Kilojoules per 100 grammes or 100 millilitres. Food's calorific value is usually given in kilocalories (kcal).
3.