Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is the typical temperature range of oil leaving reciprocating engine and turbine bearings?

120°F to 140°F
150°F to 170°F
180°F to 110°F
200°F to 220°F

The correct answer is: 180°F to 110°F

The typical temperature range of oil leaving reciprocating engine and turbine bearings generally falls within a specific range indicative of optimal operating conditions. The correct range should reflect the conditions under which the engines operate effectively while also ensuring that the oil remains within safe temperature limits to prevent degradation and maintain lubrication properties. The range from 180°F to 110°F is not consistent with normal operational temperatures for oil in these engines, as oil tends to be higher than this range during typical function. On the other hand, the other options suggest temperatures that align with common operating conditions, demonstrating that these bearings run at elevated temperatures to dissipate heat generated by friction during operation. In practice, oil temperatures can vary significantly based on the type of engine, operating conditions, and load factors, but the higher ranges, such as those seen in items B and D, are more reflective of the actual heat produced in bearing environments. Understanding these operational temperature ranges is essential for monitoring engine performance and ensuring proper maintenance procedures are followed to prevent overheating and premature wear of engine components.