Discussion
The shaft which raises and lowers the inlet and exhaust valves at proper time?
Answer: B
The shaft is the cam shaft.
The camshaft carries a cam for each valve. As it turns, each cam lifts its follower at the right moment, opening the inlet or exhaust valve through the push rod and rocker arm, and the valve spring closes it again. In a four-stroke engine the camshaft turns at half the crankshaft speed, since each valve opens once every two revolutions.
The crankshaft drives the camshaft but does not act on the valves directly. A rocker shaft only carries the rocker arms as a pivot; it does not decide the timing.
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