Question 148Motor Plants - Assistant Engineer

The correct answer is B) "B" is the camshaft and its rpm will match that of the flywheel. The camshaft in a diesel engine is responsible for opening and closing the engine's valves, and it is typically driven by the crankshaft at a reduced speed. In a four-stroke diesel engine, the camshaft rotates at half the speed of the crankshaft, as it takes two crankshaft revolutions to complete one full cycle of the engine. However, in the illustration provided (MO-0122), the "B" label is indicating the camshaft, and its speed is specified to match that of the flywheel, which is directly connected to the crankshaft. Therefore, the correct answer is that the camshaft labeled "B" rotates at the same speed as the flywheel. The other options are incorrect because they do not accurately describe the relationship between the camshaft and the crankshaft in the given illustration.