Question 406Electricity & Electronics - Assistant Engineer

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A digital multimeter is set up as shown in the illustration to test an individual element of a three-phase immersion heater. The elements are connected across terminals 1 and 4, 2 and 5, and 3 and 6 as shown. The reading across terminals 1 and 4 is 32 ohms. The reading across terminals 2 and 5 is 32 ohms. The reading across terminals 3 and 6 as shown is "OL" ohms. What condition is indicated? Illustration EL-0216

Diagram for USCG Electrical Assistant: A digital multimeter is set up as shown in the illustration to test an...
AThe element across terminals 3 and 6 is short-circuited. The other two elements are functioning properly.
BThe element across terminals 3 and 6 is functioning properly. The other two elements are open-circuited.
CThe element across terminals 3 and 6 is open-circuited. The other two elements are functioning properly.
DThe element across terminals 3 and 6 is functioning properly. The other two elements are short-circuited.
AI Explanation

The correct answer is C) The element across terminals 3 and 6 is open-circuited. The other two elements are functioning properly. This is because the reading of "OL" (open loop) across terminals 3 and 6 indicates an open circuit, meaning that element is not functioning. The other two elements are reading 32 ohms, which is a normal resistance reading, indicating they are functioning properly. The other answer choices are incorrect because they do not align with the provided test results. For example, option A is incorrect because an open-circuited element would not read "OL", and option D is incorrect because the other two elements are not short-circuited based on the 32-ohm readings.

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