Discussion
Which fault does a stuck open ventilation valve produce?
Answer: B
Too much flow admits unmetered air and can carry oil into the inlet. The last option describes both consequences, which makes it a correct and fuller version. A blocked valve produces the pressurisation instead. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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