Question

The aviation fuel used in the engines of jet airplanes is:
(A) CNG
(B) Petrol
(C) Kerosene
(D) Diesel

Answer 1

Hint
Firstly, we will see that Kerosene has the highest calorific value. Then we will see at high temperature $ (38^\circ C) $ it actually produces flammable vapour. The boiling point is about $ 150^\circ C $ and $ 300^\circ C $ . We will get to know if kerosene has a lower freezing point, higher flash point and lower viscosity. Moreover, it has lower cost. So, we will get to know that kerosene is safe to use as a fuel. That’s why we can use kerosene as aviation fuel in jet airplanes.

Complete step by step answer
Kerosene has the highest calorific value. Heat of combustion is similar to that of so it is used as aviation in jet aeroplanes.
Kerosene is less volatile than gasoline so the temperature at which it will generate a flammable vapour near its surface is $ 38^\circ C $ or higher whereas gasoline is as low as $ - 40^\circ C $ . Kerosene has a higher flash point. So, this property makes kerosene a relatively safe fuel to use and store.
Kerosene has a lowering freezing point than gasoline making it naturally protected against freezing in otherwise very cold temperatures.
Kerosene has a lower viscosity rating during flight operation. This is important because highly viscous fuels can clog up internal channels in an air plane’s engine. Kerosene is watery and has minimal viscosity so it is used in airplane’s engines.
Moreover, kerosene is significantly cheaper than any other fuels.
The boiling point of kerosene is about $ 150^\circ C $ and $ 300^\circ C $ , so it is one of the so-called middle distillates of crude oil along with diesel fuel. Using the distillation process we can get straight run kerosene and by chemically decomposing we can get cracked kerosene. So, kerosene is used as fuel in many cases.
The aviation fuel used in the engines of jet airplanes is kerosene (Option (C)).

Additional Information
Kerosene it is also called paraffin or paraffin oil it is actually flammable hydrocarbon liquid commonly used as a fuel. The chemical composition depends on its source but it actually consists of about 10 different hydrocarbons each containing 10 to 16 carbon atoms per molecule.

Note
One might get confused about what will be the correct answer after getting the questions. To know the actual answer, one might know the basic characteristics of kerosene and others. Kerosene has so many characteristics that actually tell us that it is the most suitable fuel for engines in jet plane.