Question 92General Subjects - 1st Asst/Chief
70% to passWhich of the following statements represents the basic principle of operation of an electrical salinity indicator?
AMeasures the hydrogen ion concentration.
BMeasures the voltage of the chloride ions.
CMeasures the electrical resistance of the water.
DDetermines the conductivity of the dissolved oxygen.
AI Explanation
The correct answer is C) Measures the electrical resistance of the water. An electrical salinity indicator measures the conductivity or electrical resistance of the water, which is directly related to the salinity or salt content of the water. The more dissolved salts in the water, the higher the conductivity and lower the electrical resistance. By measuring this resistance, the salinity of the water can be determined. The other options are incorrect because: A) Measures the hydrogen ion concentration (pH), not salinity. B) Does not measure voltage of chloride ions. D) Measures dissolved oxygen, not salinity.
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