Question 99Electricity & Electronics - Assistant Engineer

70% to pass

Assuming that the electrolyte has had sufficient time to be uniformly diffused throughout the cell, if the open-circuit cell voltage as measured by a digital multimeter is 2.12, what would be the approximate specific gravity?

A1.260
B1.270
C1.280
D1.290
AI Explanation

The correct answer is C) 1.280. The open-circuit cell voltage of 2.12 volts corresponds to a specific gravity of approximately 1.280 for a lead-acid battery under normal conditions. This relationship between open-circuit voltage and specific gravity is well-established in the regulations and guidelines for the U.S. Coast Guard Captain's License Examinations. The other answer choices are incorrect because they do not accurately reflect the specific gravity associated with a 2.12 volt open-circuit cell voltage. A specific gravity of 1.260, 1.270, or 1.290 would not be the appropriate match for the given voltage measurement.

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