AG Mechanics CDE Practice Exam

The camshaft has two lobes because it is responsible for controlling the opening and closing of the intake and exhaust valves in an engine. Each lobe on the camshaft corresponds to one valve, with one lobe controlling the intake valve and the other lobe controlling the exhaust valve. This design allows for precise timing of the valve operation, ensuring optimal engine performance. Therefore, the correct answer is B. Option A is incorrect because having only one lobe on the camshaft would not be sufficient to control both the intake and exhaust valves effectively. Option C is incorrect as having four lobes would be too many for a typical engine setup and would not be necessary for the basic operation of the engine. Option D is incorrect because having eight lobes on a camshaft would be excessive for most standard engine configurations and would not provide any additional benefits in terms of valve control.