Practice Test Geeks(MTC) Marine Technician Certification Practice Test
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Transmission & Drivetrain Systems 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 Transmission & Drivetrain Systems flashcards as text

  1. What is the purpose of a trolling valve on a marine transmission?

    Answer: Modulates clutch engagement to allow low-speed maneuvering at higher engine RPM

    A trolling valve partially slips the clutch pack, allowing the engine to run at productive RPM for accessories while the propeller turns slowly for trolling.

  2. Which type of transmission is most commonly found in outboard motors?

    Answer: Integrated bevel gear reduction with dog clutch engagement

    Outboard lower units use bevel gears for 90-degree power redirection and a sliding dog clutch for forward/neutral/reverse selection.

  3. A stern drive unit making a grinding noise only in reverse is MOST likely caused by:

    Answer: Worn or damaged reverse gear or its bearings in the lower unit

    Grinding in reverse typically indicates worn reverse gears or bearings that are only loaded in that direction, requiring lower unit disassembly.

  4. What does a negative gear ratio (less than 1:1) in a marine transmission indicate?

    Answer: The propeller shaft rotates faster than the engine

    A ratio below 1:1 (overdrive) means the output shaft rotates faster than the input, though this is rare in marine applications and typically seen in high-speed craft.

  5. During a sea trial, the technician notices the boat pulls hard to port when in forward gear at cruise speed. The FIRST item to inspect is:

    Answer: Propeller for bent blades, incorrect pitch, or wrong rotation direction

    Propeller damage, wrong pitch, or incorrect rotation (especially on twins) creates unequal thrust that causes persistent course deviation in forward gear.

  6. What is the correct procedure for aligning an inboard engine to its propeller shaft?

    Answer: Align with the engine at operating temperature and the boat fully loaded afloat

    Engine alignment must be performed afloat at operating temperature because the hull flexes differently in water and thermal expansion shifts the engine position.

  7. Gear lube in an outboard lower unit that appears milky white indicates:

    Answer: Water contamination through a failed seal or gasket

    Milky or creamy gear lube is a classic sign that water has emulsified with the oil, indicating a failed propeller shaft seal, drain gasket, or cracked housing.