Practice Test Geeks(MTC) Marine Technician Certification Practice Test
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Preventive Maintenance Procedures Flashcards

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

Read the first 7 Preventive Maintenance Procedures flashcards as text

  1. When performing PM on a marine battery bank, what voltage reading on a fully charged 12V flooded lead-acid battery indicates acceptable state of charge?

    Answer: 12.6–12.8 V

    A fully charged 12V flooded lead-acid battery at rest should read approximately 12.6–12.8 V; lower readings suggest partial or full discharge.

  2. A PM checklist calls for inspecting the marine AC generator's drive belt. Which finding requires immediate replacement?

    Answer: Belt shows surface glazing, cracking, or fraying

    Glazing, cracking, or fraying indicates belt degradation that can lead to slippage or sudden failure, interrupting battery charging and cooling.

  3. During a PM inspection of a marine vessel's through-hull fittings, what condition should prompt immediate haul-out and repair?

    Answer: Dezincification (pinkish, porous appearance) or visible cracking of the fitting

    Dezincification weakens brass/bronze fittings significantly, and a failed through-hull below the waterline can sink the vessel rapidly.

  4. What is the correct method to test a marine bilge pump's automatic float switch during PM?

    Answer: Manually lift the float switch while observing pump activation

    Manually lifting the float switch simulates rising water and confirms the pump activates without having to flood the bilge.

  5. When topping off a marine diesel day tank as part of a PM procedure, what is the correct reason to leave an air gap at the top of the tank?

    Answer: To allow fuel to expand with temperature changes and prevent overflow

    Diesel fuel expands as temperature rises, and leaving a small air gap prevents overflow through the vent or filler cap.

  6. A PM schedule requires inspecting marine engine mounts. Which symptom most strongly suggests engine mounts need replacement?

    Answer: Excessive vibration transmitted to the hull or visible rubber deterioration

    Deteriorated or collapsed engine mounts transfer vibration directly to the hull structure and can cause misalignment of the propeller shaft.

  7. What is the purpose of winterizing a freshwater cooling system with propylene glycol antifreeze rather than ethylene glycol?

    Answer: Propylene glycol is less toxic if it enters the bilge or waterways

    Propylene glycol is generally recognized as safe (GRAS) and is environmentally preferable for marine use because ethylene glycol is toxic to aquatic life.