DMRJ, Scramjet - GS questions based on daily current affairs

1)   Which of the following is/are true?

1) Ramjet accelerates the air to supersonic velocities before combustion.
2) Scramjet engines are faster and efficient than ramjets.

a. Only 1
b. Only 2
c. Both 1 and 2
d. Neither 1 nor 2
Answer  Explanation 

ANSWER: Only 2

Explanation:

  • A scramjet (supersonic combusting ramjet) is a variant of a ramjet air breathing jet engine in which combustion takes place in supersonic airflow.
  • As in ramjets, a scramjet relies on high vehicle speed to forcefully compress the incoming air before combustion (hence ramjet), but a ramjet decelerates the air to subsonic velocities before combustion, while airflow in a scramjet is supersonic throughout the entire engine.
  • This allows the scramjet to operate efficiently at extremely high speeds.
  • In a ramjet, the combustion chamber - where the air is mixed with fuel and ignited - only works at subsonic speeds. So the intake slows the air down, releasing some of its energy as a shock wave, but this reduces fuel efficiency.
2)   Scramjet is

a. Supra-sonic combustion ramjets
b. Subsonic combustible ramjets
c. Supersonic combustion ramjets
d. Supra-sonic combustible ramjets
Answer  Explanation 

ANSWER: Supersonic combustion ramjets

Explanation:

  • Scramjet programs refer to research and testing programs for the development of supersonic combustion ramjets, known as scramjets.
  • The collection and use of atmospheric air involves challenges as the launch vehicle speeds through atmosphere at supersonic speeds. This calls for the development of ramjet or scramjet (supersonic combustion ramjet) technologies.

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