|Consider the following sentences with respect of cryogenic rocket engine-|
|1. It uses liquid hydrogen as fuel and liquid oxygen as oxidizer at super cooled state.|
|2. The combination of hydrogen and oxygen offers highest calorific value for rocket engine that needs to produce large amount of thrust.|
|3. Propellants at liquid state having more density than that of gaseous state, thereby more propellants can be stored on fuel tank.|
|4. Russia was the 1st country to develop cryogenic rocket engine. Which of the following statements given above is/are correct?|
A) 2 and 4 are correct
B) 1 and 4 are correct
C) All of them are correct
D) 1, 2 and 3 are correct
Correct Answer: D
Solution :[d] The United States was the first country to develop cryogenic rocket engines. The Centaur upper stage, with RL-10 engines, registered its first successful flight in 1963 and is still used on the Atlas V rocket. America's early mastery of the technology paved the way for the J-2 engine, which powered the upper stages of the immensely powerful Saturn V rocket that sent humans to the Moon.
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