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The _____ control(s) valve opening and closing and rotates at half the crankshaft speed.

a) Camshaft
b) Crankshaft
c) Piston rings
d) Rocker arm

Answer :

Final answer:

The camshaft controls the opening and closing of valves in an engine, rotating at half the speed of the crankshaft. It plays a vital role in the engine's operation by ensuring the proper intake of fuel and expulsion of exhaust.

Explanation:

The camshaft controls valve opening and closing and rotates at half the crankshaft speed. In a car's four-stroke engine, the camshaft plays a critical role in engine operation. The crankshaft's rotation, determined by its mechanical linkage to the pistons, is directly geared to the camshaft. This gearing ensures that the camshaft's angle is half that of the crankshaft's (0 = /2).

The motion of the camshaft activates the followers, which are precisely controlled by the cam's shape, to open and close the engine's valves. These valves are responsible for the intake of fuel and the expulsion of exhaust from the cylinders, essential for the engine's four-stroke cycle.

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