Which of the following ways of thrust chamber cooling may use niobium metal?

Film cooling

Radiation cooling

Cooling jacket

Ablative cooling

Correct Answer : Radiation cooling

Explanation : Niobium is a special high temperature material that can radiate excess heat. So it is used as part of the radiation cooling of the thrust chamber.

Recently Updated in Rocket Propulsion Questions

Which of the following is not a property of the main liquid oxygen valve?

Low pressure

High pressure

Cryogenic

Reusable ball valve

Correct Answer : Option (A) : Low pressure

Explanation : Main liquid oxygen valves are under high pressure. Since liquid oxygen easily evaporates under normal atmospheric conditions, they are kept in cryogenic tanks. These valves also make use of reusable ball valves.

German antiaircraft missile Wasserfall used four of which of the following valves?

Latch valves

Burst diaphragm

Isolation valves

Drainage valves

Correct Answer : Option (B) : Burst diaphragm

Explanation : Burst diaphragm is used in the German missile Wasserfall. It actually used 4 of such burst disks.

Which of the following valves help in controlling gas pressures?

Latch valves

Isolation valves

Burst diaphragm

Pressure regulator

Correct Answer : Option (D) : Pressure regulator

Explanation : Pressure regulator, as the name mentions, helps in regulating or controlling gas pressure. Other valves serve different purposes, like maintaining the flow until a pressure differential (burst diaphragm) or for isolation of a particular flow region.