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Naval Maintenance And Mechanical Tools – Technical Manuals, Fasteners, And System Operations Practice Test

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What is the approximate rate of temperature rise per hour for the LO purifier heater when heating the Main Reduction Gear sump oil from 40°F to 90°F in one hour?
Correct Answer:
50°F per hour
Explanation:
Rate of temperature rise is simply the change in temperature divided by the time allowed. Here, the oil needs to go from 40°F to 90°F, which is a 50°F increase. Over one hour, that works out to 50°F per hour, assuming the heater delivers a steady heat input and heat losses are small. The other numbers would only fit if the final temperature, initial temperature, or the time were different—for example, a rate of 60°F per hour would reach 100°F in an hour, while 25°F per hour would only reach 65°F, and 45°F per hour would reach 85°F.

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