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. How often should raw water impellers on marine engines typically be inspected or replaced?

    Answer: Every 200–300 hours or annually, whichever comes first

    Raw water impellers degrade with use and age, so OEM guidelines commonly specify inspection or replacement every 200–300 hours or once per season.

  2. What is the primary purpose of zincs (sacrificial anodes) in marine preventive maintenance?

    Answer: To protect metal components from galvanic corrosion

    Sacrificial anodes corrode preferentially to protect more valuable metal parts from galvanic corrosion in an electrolytic environment.

  3. When inspecting a marine diesel fuel system during PM, which condition in the fuel filter bowl is most concerning?

    Answer: Dark fuel with visible water or microbial growth

    Dark fuel with water or microbial (algae/bacteria) contamination can clog injectors and cause injection system damage if not addressed.

  4. A technician is performing PM on a marine outboard. What does checking the gear lube for a milky appearance indicate?

    Answer: Water has infiltrated the lower unit, likely via a failed seal

    Milky or grey gear lube indicates water intrusion through a damaged propeller shaft seal or drain/fill plug gasket.

  5. During a vessel's annual PM, what is the correct procedure when replacing a stuffing box packing?

    Answer: Allow 1–2 drops per minute while underway to lubricate the shaft

    A properly adjusted stuffing box should allow a slow drip (1–2 drops per minute) underway to provide lubrication and prevent overheating of the packing material.

  6. What is the recommended action when PM inspection reveals hairline cracks in a fiberglass hull above the waterline?

    Answer: Assess depth and structural involvement, then repair to prevent moisture intrusion

    Hairline gelcoat cracks can allow water absorption leading to osmotic blistering or structural delamination, so they should be assessed and repaired promptly.

  7. Which maintenance interval item is MOST critical for a marine gasoline inboard engine to prevent carbon monoxide accumulation in the bilge?

    Answer: Inspecting and maintaining exhaust system integrity

    A leaking or deteriorated exhaust system can allow CO to enter the bilge or cabin, creating a life-threatening hazard aboard the vessel.