Which statement best contrasts nuclear-powered submarines with diesel-electric submarines?

Which statement best contrasts nuclear-powered submarines with diesel-electric submarines?

• A. Nuclear-powered submarines use a reactor for propulsion and can stay submerged for long durations.
• B. Diesel-electric submarines stay submerged longer than nuclear ones.
• C. Nuclear-powered submarines require frequent surfacing to recharge batteries.
• D. Diesel-electric submarines have no battery charging needs.

Answer: (A)

Endurance while submerged is what distinguishes the two. Nuclear-powered submarines rely on a nuclear reactor to generate propulsion and electric power, so they can remain underwater for long periods—months—without needing to refuel or recharge, aside from crew needs and maintenance. This nearly limitless energy source lets the submarine stay submerged for extended missions without surfacing. Diesel-electric submarines, on the other hand, run on batteries that are charged by diesel engines when they are on the surface or using a snorkel. Once the batteries run down, they must surface or snorkel to recharge, which limits how long they can stay underwater. So the statement about a reactor powering propulsion and enabling long submerged durations best contrasts the two types. The other options misstate how long diesel-electrics can stay submerged, how often nuclear boats must surface, or whether diesel-electrics need battery charging.

Endurance while submerged is what distinguishes the two. Nuclear-powered submarines rely on a nuclear reactor to generate propulsion and electric power, so they can remain underwater for long periods—months—without needing to refuel or recharge, aside from crew needs and maintenance. This nearly limitless energy source lets the submarine stay submerged for extended missions without surfacing.

Diesel-electric submarines, on the other hand, run on batteries that are charged by diesel engines when they are on the surface or using a snorkel. Once the batteries run down, they must surface or snorkel to recharge, which limits how long they can stay underwater.

So the statement about a reactor powering propulsion and enabling long submerged durations best contrasts the two types. The other options misstate how long diesel-electrics can stay submerged, how often nuclear boats must surface, or whether diesel-electrics need battery charging.