Question

Which of the following represents the correct increasing

order of calorific value of the given fuels?

A. Hydrogen < LPG < Biogas < Cow dung cake < coal

B. Cow dung cake < Biogas < LPG < Coal < Hydrogen

C. Cow dung cake < Coal < Biogas < LPG < Hydrogen

D.Hydrogen < Cow dung cake < LPG < Biogas < Coal

class 8 combustion and flame​

Answer 1

Answer:

option E all of these is correct

Answer 2

B) Cow Dung Cake < Wood < Petrol < CNG  represent the correct increasing order of calorific value.

Fuel-

• Fuel is material that is burned to produce heat or electricity.

• Eg- coal, petrol, wood CNG etc.

Order of fuels

Cow Dung Cake < Wood < Petrol < CNG.

       Fuel                                       Calorific Value (kJ/kg)

1. Cow dung cake                          6000−8000
2. Wood                                        17000−22000
3. Coal                                           25000−33000
4. Petrol, Kerosene, Diesel               45000
5. Methane, CNG                               50000
6. Biogas                                       35000−40000
7. Hydrogen                                      150000