Question 360Motor Plants - Assistant Engineer

The correct answer is D) straight impeller vane with concentric housing. Cooling water pumps driven by direct reversing diesel engines typically use a straight impeller vane design with a concentric housing. This configuration allows the pump to efficiently move the cooling water through the system regardless of the engine's direction of rotation, which is essential for a reversing diesel engine. The other answer choices are not correct because: A) Curved impeller vanes are more commonly used in centrifugal pumps, not cooling water pumps for reversing diesel engines. B) A tangential housing is not the typical design for cooling water pumps in this application. C) Curved impeller vanes are not the standard for cooling water pumps on reversing diesel engines.