Question

4. Which fuel from the given below has the highest calorific value (a) Cow dung cakes (b) Wood (c) Coal (d) Methane​

Answer 1

From the list below, (d)methane has the highest calorific value.

Explanation:

• Cow dung cake, also known as "Chulha" in India, is created and utilized as fuel by using animal husbandry. Because it consumes more oxygen and takes a long time to ignite, cow dung cake is not regarded as the cleanest fuel. Cow dung cake has a calorific value of 6000-8000$\frac{KJ}{kg}$.
• Wood combustion is currently the most common use of energy obtained from solid fuel biomass. When you burn wood, the stored potential energy in the log is released as a result of other excited atoms heating it up. Wood has a calorific value of 18000$\frac{KJ}{kg}$.
• Coal is a solid carbon-rich material that is usually brown or black and found in layered sedimentary strata, making it one of the most important major fossil fuels. Coal has a calorific value of 25000-33000$\frac{KJ}{kg}$.
• Methane is a gas found in trace amounts in the atmosphere of the Earth. The simplest hydrocarbon is methane, which is made up of one carbon atom and four hydrogen atoms. Methane is a potent greenhouse gas that is also combustible and widely utilized as a fuel. Methane has a calorific value of 55400$\frac{KJ}{kg}$.