Question

The table below shows some fuels along with their calorific values and ignition temperatures.
$$\begin{array}{ccc}\text{Fuel}& \text{Calorific value (kJ/kg)}& \text{Ignition Temperature (}{}^0\text{C)}\\ \text{A}& \text{100}& \text{5}\\ \text{B}& \text{80}& \text{50}\\ \text{C}& \text{30}& \text{60}\\ \text{D}& \text{20}& \text{70}\end{array}$$
Which of these can be considered as an ideal fuel?

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is B B

An ideal fuel should possess an high calorific value and a moderate ignition temperature. The ignition temperature must not be lower than room temperature.
$\bullet$ Fuel A has a highest calorific value. Its ignition temperatrure is much lower than the room temperature. Thus, it can not be considered as a ideal fuel.
$\bullet$ Fuel B has high calorific value and moderate ignition temperature. Thus, it makes an ideal fuel.
$\bullet$ However, fuel C and D are not ideal fuel because they have low calorific values and high ignition temperature.