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RAS question

Which cryogenic engine did ISRO demonstrate in boot-strap start mode to enhance restart capability for future LVM3 missions?

Correct answer: (B) CE-20.

ISRO demonstrated the CE-20 cryogenic engine in boot-strap start mode to strengthen restart capability and mission flexibility for future LVM3 flights.

  1. (A)

    CE-7.5

  2. (B)

    CE-20

  3. (C)

    Vikas

  4. (D)

    CE-12

Explanation

ISRO's demonstration involved the CE-20 cryogenic engine, which powers the LVM3 upper stage and is already qualified for Gaganyaan missions. The point of the test was restart capability: future LVM3 missions may need multiple in-flight restarts, but the present configuration would require an extra start-up gas bottle and related systems for each restart, reducing payload capability. In the boot-strap mode test, conducted under vacuum conditions at the High-Altitude Test facility in Mahendragiri, the turbopumps started without the start-up system after ignition steps in the thrust chamber and gas generator. The Mahendragiri test was therefore a ground technology demonstration toward future LVM3 flexibility, not an orbital restart during Gaganyaan G1.

Why the other options are wrong

  • (A) CE-7.5 was not used in ISRO's boot-strap start demonstration; ISRO demonstrated the CE-20 cryogenic engine.
  • (C) Vikas is not a cryogenic engine and was not used in ISRO's boot-strap mode start demonstration.
  • (D) CE-12 was not used in ISRO's boot-strap mode test; ISRO tested the CE-20 cryogenic engine.

Concept

Space technology within Science and Technology includes launch-vehicle propulsion and mission capability. RAS often asks about ISRO milestones as direct current-affairs facts where the exact system name matters.

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