Question 139Steam Plants - QMED70% to pass
In a gravity type lube oil service system, if no lube oil appears in the sight glass of the return drop line while underway, this is a positive indication that _______________.
AI Explanation
The correct answer is C) no oil is overflowing from the gravity tank.
In a gravity type lube oil service system, the presence of oil in the sight glass of the return drop line indicates that oil is overflowing from the gravity tank and circulating through the system. If no oil appears in the sight glass, it means that no oil is overflowing from the gravity tank, suggesting a potential issue with the system, such as a clogged line or a failure in the oil supply.
The other options are incorrect because: A) a failure of all lube oil pumps would not necessarily prevent oil from overflowing the gravity tank, B) the lack of oil in the sight glass does not directly indicate that no oil is flowing to the bearings, and D) the gravity tanks being empty is not the only possible reason for the lack of oil in the sight glass.
Related Questions
#137 According to the illustrated diagram, what is the normal source of heat for the boiler air heaters when the vessel is underway under full power? Illustration SG-0024 #138 A lube oil sample is taken from the main engine lube oil system and visually inspected. Which of the following would indicate water contamination? #140 The best indication that a bearing is being properly lubricated is by the _______________.#141 Excessive water in an operating lube oil system can be detected by _______________.#142 The maximum temperature rise of oil passing through any reduction gear set, or bearing, should not exceed _______________.