Question 42Electricity & Electronics - 1st Asst/Chief
70% to passAs shown in the illustrated echo sounding display unit and control panel and pertinent operating characteristic tables, what situation would require increasing the unit gain? Illustration EL-0186
Atransitioning from a stone/rock seabed to a sand seabed
Btransitioning from a soft mud seabed to a mud/sand seabed
Ctransitioning from a sand/mud seabed to a sand seabed
Dtransitioning from a sand seabed to a stone/rock seabed
AI Explanation
The correct answer is A) transitioning from a stone/rock seabed to a sand seabed. When transitioning from a hard, rocky seabed to a softer, sandy seabed, the echo sounder will receive weaker returns from the seafloor. To compensate for this, the operator would need to increase the unit gain to amplify the weaker signals and provide a clearer display. The other answer choices describe transitions where the seafloor material either stays the same (C and D) or becomes softer (B), which would not require an increase in gain to maintain a clear echo sounder display.
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