Question 1954 Deck General

The correct answer is B) gasoline engines. Backfire flame arrestors are required to be installed on gasoline engines on small passenger vessels to prevent any engine backfires from igniting flammable vapors in the engine compartment. This is a safety regulation mandated by the US Coast Guard to mitigate the risk of fires and explosions on these types of vessels. The other answer choices are incorrect because turbocharged diesel engines (A) do not require backfire flame arrestors, and all-electric motors (C) do not have the risk of backfires that would necessitate such a device. Option D is incorrect because it combines the diesel and electric motor scenarios, which are not the correct application for backfire flame arrestors.