Question 212Motor Plants - 1st Asst/Chief
70% to passIn the event of a crankcase rich oil mist to air mixture explosion, where the doors are blown off the engine, which of the following may occur after the initial explosion?
AA secondary explosion as air is drawn back into the crankcase.
BThe crankcase pressure will remain higher than normal.
CThe engine will overspeed.
DAny crankcase fire will be self-extinguished.
AI Explanation
The correct answer is A) A secondary explosion as air is drawn back into the crankcase. In the event of a crankcase rich oil mist to air mixture explosion, the initial explosion will blow off the engine doors. As the crankcase pressure drops, air will be drawn back into the crankcase, creating the potential for a secondary explosion of the remaining oil mist and air mixture. The other options are incorrect - the crankcase pressure will not remain higher than normal after the initial explosion (B), the engine will not overspeed (C), and any crankcase fire will not be self-extinguished (D).
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