Technician A says that a crankshaft must make two full rotations for the camshaft to make one. Technician B says that some engines vary the valve timing during operation to increase performance. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct; in a four-stroke engine, the crankshaft rotates twice for every one rotation of the camshaft. Technician B is also correct; some engines have variable valve timing to optimize performance at different engine speeds and loads.

Technician a Says That a Crankshaft Must Make Two Full