HK Engine Operator Grade 2 Practice Questions - Hong Kong Local Engine Operator Grade 2 Certificate Of Competency Exam

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During routine checks of a running turbocharger, which observation most clearly indicates a developing problem needing investigation?

A slight warm feel on the compressor casing after a long run A steady lubricating-oil pressure within the maker's range Unusual vibration, abnormal noise, or a sudden drop in boost/scavenge pressure Normal exhaust colour with steady RPM

Correct Answer:

Unusual vibration, abnormal noise, or a sudden drop in boost/scavenge pressure

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