Identify the correct sequence of the following energy sources in terms of…
2020
Identify the correct sequence of the following energy sources in terms of their heat of combustion, in increasing order:
A. Methane
B. Natural fats and oils
C. Dry wood
D. Green wood
Choose the correct answer from the options given below.
- A.
A, C, B, D
- B.
D, C, B, A
- C.
D, B, C, A
- D.
D, C, A, B
Show answer & explanation
Correct answer: B
Heat of combustion is the energy released when a fuel burns completely. For the given sources, the effective heat of combustion increases approximately as follows:
Green wood < Dry wood < Natural fats and oils < Methane
Green wood gives the least useful heat because some energy is spent evaporating moisture. Dry wood is higher. Natural fats and oils have still higher calorific value, and methane has the highest heat of combustion among the given options.
Therefore, the increasing order is D, C, B, A.