Question

What is the primary purpose of the C-25 stage in GSLV Mk III?

• A. Navigation support
• B. Launch satellite in Sun-synchronous orbit
• C. Upper-stage cryogenic propulsion
• D. Boost recovery system

Answer 1

Answer:

C. Upper-stage cryogenic propulsion

• Correct Answer: Option C) Upper-stage cryogenic propulsion

• The C-25 stage in GSLV Mk III (now known as LVM3) is the cryogenic upper stage of the launch vehicle. Here's why this is the correct answer:

• The GSLV Mk III is a three-stage heavy-lift launch vehicle developed by ISRO (Indian Space Research Organisation).

• The three stages are:

• 1. S200 - Solid rocket boosters (first stage)

• 2. L110 - Liquid core stage with earth-storable propellants (second stage)

• 3. C-25 - Cryogenic upper stage (third stage)

• The C-25 stage specifically uses cryogenic propellants - liquid hydrogen (LH2) as fuel and liquid oxygen (LOX) as oxidizer. This stage provides the final thrust needed to place satellites into their intended orbits after the initial lift-off and acceleration provided by the first two stages.

• The cryogenic technology is crucial for upper stages as it provides higher specific impulse (efficiency) compared to solid or conventional liquid propellants, allowing for more payload capacity to be delivered to higher orbits.

• The C-25 stage is not primarily designed for satellite launch into sun-synchronous orbit (though it can help achieve this), boost recovery, or option C (which isn't clearly defined in the image).