Practice Test Geeks(MTC) Marine Technician Certification Practice Test
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Marine Technician Electrical & Electronics 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 Marine Technician Electrical & Electronics flashcards as text

  1. A marine engine's knock sensor sends what type of signal to the ECM?

    Answer: A piezoelectric voltage pulse corresponding to engine vibration

    Knock sensors use a piezoelectric crystal that generates a small AC voltage in response to the high-frequency vibrations caused by detonation.

  2. Stray current corrosion differs from galvanic corrosion in that it is caused by:

    Answer: Impressed DC current from an external source flowing through the water

    Stray current corrosion occurs when DC electrical current leaks from the boat's wiring into the water and finds a return path through underwater metal fittings.

  3. On a marine chartplotter, 'COG' and 'SOG' refer to:

    Answer: Course Over Ground and Speed Over Ground

    COG (Course Over Ground) and SOG (Speed Over Ground) are GPS-derived measurements of actual direction and speed relative to the Earth's surface.

  4. When troubleshooting an open circuit in a marine lighting system, a technician should use a multimeter set to:

    Answer: Voltage (DC volts) probing each point to ground

    Voltage testing to ground while the circuit is powered quickly identifies the last point with voltage before an open, isolating the break location.

  5. A marine engine's MAP (Manifold Absolute Pressure) sensor is used to:

    Answer: Determine engine load for fuel injection and ignition timing calculations

    The MAP sensor measures intake manifold vacuum/pressure, allowing the ECM to calculate air density and engine load for precise fuel and timing control.

  6. What is the minimum wire gauge (AWG) typically required for a 20-amp, 12V DC circuit with a 10-foot conductor run per ABYC standards?

    Answer: 12 AWG

    ABYC E-11 tables specify 12 AWG as the minimum for a 20A circuit with up to a 10-foot conductor length to keep voltage drop within acceptable limits.

  7. A Loran-C receiver is no longer useful for navigation because:

    Answer: The Loran-C transmission network was shut down in 2010

    The US and Canadian Loran-C transmission stations were decommissioned in February 2010, rendering all Loran-C receivers unable to obtain position fixes.