General Studies I
Consider the following statements in respect of a jet engine and a rocket :
1- A jet engine uses the surrounding air for its oxygen supply and so is unsuitable for motion in space
2- A rocket carries its own supply of oxygen in the gas form, and fuel.
Which of the atatements given above is/are correct?
|C||Both 1 and 2|
|D||Neither 1 nor 2|
Rocket engine is a machine that develops thrust by the rapid expulsion of matter. Most rockets today operate with either solid or liquid propellants. The word propellant does not mean simply fuel, as you might think; it means both fuel and oxidizer. The fuel is the chemical rockets burn but, for burning to take place, an oxidizer (oxygen) must be present. Jet engines draw oxygen into their engines from the surrounding air. Rockets do not have the luxury that jet planes have; they must carry oxygen with them into space, where there is no air.
Although a rocket engine is a jet engine, it has one major difference in that it does not use atmospheric air as the propulsive fluid stream. Instead, it produces its own propelling fluid by the combustion of liquid or chemically decomposed fuel with oxygen, which it carries, thus enabling it to operate outside the earth’s atmosphere. It is, therefore, only suitable for operation over short periods