Question 305Electricity & Electronics - Assistant Engineer

70% to pass

Using the temperature correction factor for the winding insulation temperature graph shown in the illustration, what would be the correction factor and the corrected temperature to 40 degrees C for a motor with an insulation resistance of 4 megohms measured at 50 degrees C? Illustration EL-0046

Diagram for USCG Electrical Assistant: Using the temperature correction factor for the winding insulation temperature...
AThe temperature correction factor is 0.5 and the corrected resistance is 2 megohms at 40 degrees C.
BThe temperature correction factor is 0.5 and the corrected resistance is 8 megohms at 40 degrees C.
CThe temperature correction factor is 2 and the corrected resistance is 2 megohms at 40 degrees C.
DThe temperature correction factor is 2 and the corrected resistance is 8 megohms at 40 degrees C.
AI Explanation

The correct answer is D) The temperature correction factor is 2 and the corrected resistance is 8 megohms at 40 degrees C. The reasoning is as follows: 1. Using the temperature correction factor graph for winding insulation resistance, a temperature change from 50 degrees C to 40 degrees C has a correction factor of approximately 2. 2. Since the insulation resistance is 4 megohms at 50 degrees C, applying the correction factor of 2 results in a corrected resistance of 8 megohms at 40 degrees C. The other options are incorrect because they do not accurately apply the temperature correction factor or calculate the corrected resistance based on the given information.

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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