Question

Which of the following boiler(s) is/are NOT used in a nuclear propulsion system for ships?

• A. Water tube boiler
• B. Cochran boiler
• C. Double evaporation boiler
• D. Boiled water reactor boiler

Hint:

Boilers in nuclear propulsion systems must align with the requirements of nuclear safety, efficiency, and high-pressure steam generation. Common non-nuclear boilers like water tube, Cochran, and double evaporation boilers are not used in these systems.

Answer 1

The Correct Option is A

Step 1: Understand the role of boilers in nuclear propulsion systems. 
Nuclear propulsion systems rely on reactors to generate heat through nuclear fission, which is then used to produce steam for turbines. Boilers used in such systems must efficiently handle high pressures, temperatures, and specific requirements for nuclear safety. 

Step 2: Analyze the options. 
Water tube boiler (Option A):Although widely used in conventional steam generation, it is not suitable for nuclear propulsion systems because it does not meet the specific safety and operational requirements of nuclear reactors.
Cochran boiler (Option B): This is a fire-tube boiler used for small-scale applications. It cannot handle the high-pressure and high-temperature requirements of nuclear propulsion systems.
Double evaporation boiler (Option C): This boiler is used in specialized non-nuclear applications to improve thermal efficiency. However, it is not part of the standard nuclear propulsion system for ships.
Boiled water reactor boiler (Option D): This is integral to nuclear propulsion systems as it uses nuclear fission to generate steam directly, making it essential in such applications.

Step 3: Determine the correct answer. 
Boilers not used in nuclear propulsion systems are: Water tube boiler (A), Cochran boiler (B), Double evaporation boiler (C). Conclusion: The boilers NOT used in nuclear propulsion systems for ships are Water tube boiler, Cochran boiler, and Double evaporation boiler.