Referring to the impressed current cathodic...

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Question 1 of 2066636eed28f7522a1c51d9d2

Referring to the impressed current cathodic hull protection system shown in the illustration, if required to control the impressed current to the anodes manually by using the hand adjustment potentiometer, what parameter should be maintained at a constant value? Illustration EL-0090

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Question 1 of 20

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🔍 Key Concepts

• Impressed current cathodic protection (ICCP) systems aim to maintain the hull at a certain electrochemical potential, not just a certain current. • In the diagram, note the location of the voltmeter (V), the ammeter (A), and the reference anodes and what each one is measuring. • Consider what the hand adjustment potentiometer is replacing when you switch from AUTO to HAND, and what quantity the automatic system normally keeps constant.

💭 Think About

• Look at what signal the electronic regulator uses in AUTO mode. When you go to HAND mode, which of the four answer choices corresponds to that same controlled quantity? • Ask yourself: for good corrosion protection, do we really care most about the total current, individual anode currents, a certain internal voltage, or the hull’s potential in the water? Which instrument in the schematic is used to check that? • When operating manually, what meter would you watch closely while you turn the hand adjustment knob, and what reading on that meter would you try to keep steady?

✅ Before You Answer

• Identify which meter in the drawing is connected to the reference anodes and what it measures. • Determine what parameter the automatic “Set” value adjust is trying to hold constant in normal operation. • Before choosing, verify which of the four options directly represents the hull’s protection level rather than just equipment output.

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