Question

3 ) technician a says that valve overlap is when both the intake and exhaust valves are open at the same time. technician b says that valve overlap is controlled by the camshaft. who is right?
a. a only
b. b only
c. both a and b
d. neither a nor b
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Explanation:

To determine who is right, we analyze each technician's statement:

• Technician A: Valve overlap occurs when both intake and exhaust valves are open simultaneously (at the end of exhaust and start of intake strokes). This is correct.
• Technician B: The camshaft controls valve timing (including when valves open/close, so it controls overlap). This is also correct.

Answer:

C. Both A and B