92F Petroleum Supply Specialist Alpha Module Practice Test

What is the purpose of water detection paste in field testing?

To detect the presence of water in fuel by color change To measure the fuel’s density To indicate fuel temperature To clean the sample

Correct Answer:

To detect the presence of water in fuel by color change

Explanation:

Water detection paste is used to quickly tell whether fuel has water in it by a color change. The paste contains an indicator that reacts with water and shifts color when water is present, giving an immediate pass/fail signal in the field. In practice, you apply a small amount of paste to a clean surface or test card, then expose it to the fuel sample. If free water is present, the indicator changes color, alerting you to contamination right away. This is a quick, visual check, not a measurement of how much water is there, not a way to assess density or temperature, and it isn’t a cleaning agent. If water is detected, you take appropriate action (drain or treat the fuel) before use.

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