USCG USCG General Eng
Set 4 • Question #335 of 498
Launch Interactive Practice Room If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably __________.
A
misalignment or worn main bearings
✓ Correct Answer
B
insufficient cylinder lubrication
C
defective or poorly fitted valves
D
all of the above
USCG NMC Regulatory Explanation
In USCG Marine Engineering General Subjects, for engine room systems involving 'If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably', the standard operating requirement is: 'misalignment or worn main bearings'.
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