ASA Marine Systems & Equipment 3

Question 1

What is the purpose of sacrificial zinc anodes on a sailboat?

Accepted Answer

Protect underwater metal components from galvanic corrosion by corroding preferentially

Answer

Zinc anodes are less noble metals that corrode first, protecting more valuable underwater fittings like the propeller and shaft from galvanic corrosion.

Question 2

How often should seacocks be exercised (opened and closed) to prevent seizing?

Accepted Answer

At least monthly to prevent them from seizing

Answer

Seacocks should be operated monthly to prevent corrosion from causing them to seize in the open position, which would make them unusable in an emergency.

Question 3

What is the primary function of a marine battery switch (also called a battery selector switch)?

Accepted Answer

Isolate or combine battery banks and disconnect batteries from the electrical system

Answer

A battery switch allows crew to select which battery bank powers the boat, combine banks for starting, or isolate all batteries for safety.

Question 4

When inspecting standing rigging, what are the most critical signs of failure risk?

Accepted Answer

Broken strands (fishhooks), cracked swage fittings, and signs of corrosion

Answer

Broken wire strands, cracked swages, and rust are warning signs of imminent rigging failure and must be addressed immediately.

Question 5

What is the correct first action when a through-hull fitting begins to leak while underway?

Accepted Answer

Close the seacock to stop flooding, then assess the situation

Answer

Closing the seacock immediately stops water ingress and gives you time to assess the damage and make a temporary repair.

(ASA) American Sailing Association Certifications Practice Test

(ASA) American Sailing Association Certifications Practice Test

ASA Marine Systems & Equipment 3