Combustion efficiency in liquid propellant rocket engines __________ with an increase in combustion temperature.

increases

decreases

oscillates

doesn�t change

Correct Answer : increases

Explanation : Combustion efficiency increases with increased combustion temperature. It is also depended on the method of injection and mixing.

Recently Updated in Rocket Propulsion Questions

1-methyl-1, 2-dicyclopropyl cyclopropane is also called as _______

RP-1

Jet fuel

Syntin

Kerosene

Correct Answer : Option (C) : Syntin

Explanation : Syntin is a high-energy formulation briefly used in the upper stages of rockets developed by the Soviet Union. Its molecular formula is C₁₀H₁₆ and it is a mixture of 4 stereoisomers.

The fuel which releases the most energy per unit mass of combustion is ______

RP-1

LH₂

Kerosene

Methane

Correct Answer : Option (B) : LH₂

Explaination : Compared to hydrocarbon fuels, liquid hydrogen delivers most energy per unit mass of combustion. Any hydrocarbon fuel, when subjected to combustion produces more pollution than LH₂.

Which of the following fuels were used in the first stage of Titan I?

RP-1

RDX

HMX

None of the above

Correct Answer : Option (A) : RP-1

Explanation : RP-1 fuel is used in the first stage of Titan 1. Other than that, it was also used in the first stages of Saturn V, Energeia, Saturn I and IB etc. It is a cheaper and less explosive alternative to LH₂.