Question 147Motor Plants - QMED

The correct answer is C) 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 operate efficiently in both forward and reverse directions, which is necessary for the reversing capabilities of the diesel engine. The other options are incorrect because: A) a curved impeller vane with tangential outlet is more commonly used in centrifugal pumps without the need for reversing, B) a straight impeller vane with tangential housing is not well-suited for reversing operation, and D) a curved impeller vane with concentric outlet would not provide the necessary efficiency and performance for a reversing diesel engine application.