The applications of Cryogenic engines can be found in

Options :
  1. rocket technology
  2. frost-free refrigerators
  3. sub-marine propulsion
  4. researches in superconductivity


Answer and Explanation :-

Answer: Option 1

Explanation:

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You can have many great ideas in your head, but what makes the difference is the action. Without action upon an idea, there will be no manifestation, no results, and no reward
-Miguel Ruiz The Four Agreements