Practice Test Geeks(MST) Marine Service Technician Practice Test
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Boat Systems & Maintenance Flashcards

7 cards from real MST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Boat Systems & Maintenance flashcards as text

  1. A bilge pump rated at 1,500 GPH at zero head will deliver how much flow at 1 meter of head?

    Answer: Significantly less than 1,500 GPH due to increased resistance

    Pump output decreases as lift height (head) increases; rated GPH at zero head always overstates real-world performance.

  2. What is the function of a sacrificial zinc anode on a boat's underwater gear?

    Answer: Provide cathodic protection by corroding in place of more noble metals

    Zinc is less noble than bronze or stainless steel, so it corrodes preferentially, protecting underwater metal components from galvanic corrosion.

  3. When inspecting a through-hull fitting, a technician finds the seacock is stiff and difficult to operate. What is the correct action?

    Answer: Apply marine grease and exercise the seacock; replace if operation does not improve

    Seacocks must operate freely for emergency use; they should be greased and exercised regularly, and replaced if they remain stiff or corroded.

  4. Which instrument reading most directly indicates engine cylinder pressure balance on a multi-cylinder marine engine?

    Answer: Compression test results across all cylinders

    Compression testing each cylinder and comparing the results directly measures combustion chamber integrity and piston ring sealing.

  5. On a marine VHF radio installation, what is the maximum allowed voltage drop for the DC supply circuit under load?

    Answer: 1 volt

    ABYC E-11 specifies a maximum 1-volt drop for electronics circuits to ensure reliable equipment operation at rated specifications.

  6. A technician is winterizing a raw-water cooled outboard. What is the last step before storage?

    Answer: Fog the cylinders with storage oil after flushing with antifreeze or blowing out water passages

    Cylinder fogging with storage oil coats internal surfaces to prevent corrosion during the off-season after water has been expelled from the cooling system.

  7. What condition is indicated when a two-stroke outboard consistently runs rich at wide-open throttle but lean at idle?

    Answer: Faulty carburetor needle clip position or worn needle jet

    The needle and needle jet control the mid-range and transition to wide-open throttle; a worn or mispositioned needle causes rich WOT and lean idle symptoms.