Multiple choice general knowledge science & technology

What is the commonly used fuel combination in a cryogenic engine?

  1. Liquid Hydrogen

  2. Liquid Nitrogen

  3. Liquid Oxygen

  4. Liquid Chlorine
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A,C Correct answer
Explanation

Cryogenic engines use liquefied gases stored at extremely low temperatures. The most common fuel combination is Liquid Hydrogen (fuel) and Liquid Oxygen (oxidizer). Liquid Nitrogen is not used as fuel in cryogenic engines, and Liquid Chlorine is toxic and not used in rocket propulsion.

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