Question

The fuel used as aviation fuel in jet aeroplanes is a special grade of

• A. Diesel
• B. Kerosene
• C. Fuel oil
• D. Petrol

Answer 1

The correct option is B

Kerosene

,Explanation for the correct option:

(b) Kerosene

• Since planes travel at very high altitudes, aircraft spend a lot of time in the air at very low temperatures.
• In order to prevent the fuel from hardening during flight, airplanes must use fuel with a low freezing point, such as kerosene.
• Kerosene's low freezing point is one of the main reasons why planes depend on it.
• The freezing point of aviation kerosene is $-47°\mathrm{C}$.
• When used in flight, aviation kerosene is less viscous than fuel oil, making jet aircraft prefer it.
• Thus this is the correct option

Explanation for the incorrect options:

(a) Diesel

• Diesel is not a viable alternative since it does not produce enough initial thrust to launch the plane.
• Hence this option is not correct

(c ) Fuel oil

• When used in flight, aviation kerosene is less viscous than fuel oil, making jet aircraft prefer it.
• Hence this option is not correct

(d) Petrol

• High viscosity liquids are vicious, gummy, and gluey, none of which are desirable characteristics for jet fuel.
• Since petrol is more vicious thus cannot be preferred over kerosene in planes.
• Hence this option is not correct

Hence, (b) Kerosene is the correct option.