Oilers/Plant Tenders (HHC) Civil Service Practice Exam 2025 – The All-in-One Guide to Exam Success!

Question: 1 / 440

A 300 horsepower stationary diesel engine running at full load for an hour uses a quantity of lube oil equal to about __________

Half a gallon

One gallon

The correct answer is one gallon because, typically, a stationary diesel engine operates with a specific lube oil consumption rate that correlates with its horsepower output. For a 300 horsepower engine running at full load, the expected lube oil usage is approximately one gallon per hour. This figure is based on standard performance data for diesel engines, where the consumption is relatively consistent due to the engine's lubrication needs for optimal operation and to reduce wear.

Engines of this size have lubrication systems designed to maintain adequate oil levels for performance and efficiency, and one gallon meets the requirements for regular operation at full load without causing any adverse effects on engine performance or longevity. Understanding this consumption rate is critical for maintenance planning and ensuring that the engine operates within safe parameters.

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Two gallons

Three gallons

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