Question

A hybrid rocket propellant uses:

• A. a liquid oxidizer and a solid fuel
• B. a complete solid propellent
• C. a beleqiud propellent
• D. None of the above

Answer 1

The correct option is A a liquid oxidizer and a solid fuel

Hybrid propellant engines represent an intermediate group between solid and liquid propellant engines. One of the substances is solid, usually the fuel, while the other, usually the oxidizer, is liquid.

The liquid is injected into the solid, whose fuel reservoir also serves as the combustion chamber. The main advantage of such engines is that they have high performance, similar to that of solid propellants, but the combustion can be moderated, stopped, or even restarted. It is difficult to make use of this concept for vary large thrusts, and thus, hybrid propellant engines are rarely built.

A hybrid engine burning nitrous oxide as the liquid oxidizer and HTPB rubber as the solid fuel powered the vehicle SpaceShipOne, which won the Ansari X-Prize.

Hence, the correct option is $\text{A}$