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Q:

The exhaust valve in a four stroke cycle petrol engine __________

A) opens at 50º before bottom dead center and closes at 15º after top dead center B) opens at bottom dead center and closes at top dead center
C) opens at 50º after bottom dead center and closes at 15º before top dead center D) may open or close anywhere
 
Answer & Explanation Answer: A) opens at 50º before bottom dead center and closes at 15º after top dead center

Explanation: The exhaust valve in a four stroke cycle petrol engine opens at 50º before bottom dead center and closes at 15º after top dead center while the inlet valve, opens at 20º before top dead center and closes at 40º after bottom dead center.

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