Marine Service Technician Certification Exam — Questions and Answers

Question 1: An AIS (Automatic Identification System) Class B transponder on a recreational vessel broadcasts what information?

Emergency-only signals — no routine broadcasts
MMSI number, vessel name, position, speed, and course (Correct answer)
Only the vessel's fuel level and engine hours
Only the vessel name — position is not transmitted

Correct answer: MMSI number, vessel name, position, speed, and course

AIS Class B transponders broadcast vessel identity, GPS position, speed over ground, course, and vessel type to nearby AIS-equipped vessels and VTS systems.

Question 2: What ABYC standard governs the installation of gasoline fuel systems on recreational boats?

ABYC A-31
ABYC P-1
ABYC H-24 (Correct answer)
ABYC E-11

Correct answer: ABYC H-24

ABYC H-24 (Gasoline Fuel Systems) establishes minimum safety standards for fuel tanks, lines, fittings, and ventilation on recreational vessels.

Question 3: A marine GPS chartplotter shows a 'No GPS Signal' warning. After confirming the antenna is connected, what is the next diagnostic step?

Reset the vessel's main circuit breaker
Replace the chartplotter display unit immediately
Check the antenna cable connection at the chartplotter and test with a known-good antenna (Correct answer)
Update the chartplotter's chart cards

Correct answer: Check the antenna cable connection at the chartplotter and test with a known-good antenna

The antenna cable connection at the chartplotter head is a common failure point; swapping to a known-good antenna isolates whether the issue is the antenna or the chartplotter.

Question 4: How do you maintain a boat's fuel system?

By ensuring the fuel system is free from leaks and replacing filters as needed (Correct answer)
By cleaning the engine’s carburetor
By replacing the spark plugs regularly
By checking the exhaust system for carbon buildup

Correct answer: By ensuring the fuel system is free from leaks and replacing filters as needed

Maintaining a boat's fuel system involves ensuring it is free from leaks and replacing filters as needed. Fuel leaks pose a significant fire hazard on a boat, making regular inspection for drips or strong odors critical. Replacing fuel filters prevents contaminants like dirt and water from reaching the engine, which can cause poor performance, stalling, or damage to fuel injectors, ensuring reliable and safe engine operation.

Question 5: When should a damaged propeller be replaced rather than repaired?

When it has minor pitch distortion from a light grounding strike
When blade erosion pitting from cavitation is superficial
When there is surface oxidation on the aluminum blades
When a blade is missing or there is a crack extending through the hub (Correct answer)

Correct answer: When a blade is missing or there is a crack extending through the hub

A missing blade or hub crack compromises structural integrity and dynamic balance to the point where repair is unsafe — replacement is required.

Question 6: What is the NMEA 2000 standard used for on modern marine vessels?

A safety standard for navigation lights
A plug-and-play digital network protocol that allows marine electronics to share data on a common backbone (Correct answer)
A GPS accuracy certification
A radio communication frequency standard

Correct answer: A plug-and-play digital network protocol that allows marine electronics to share data on a common backbone

NMEA 2000 is a CAN-bus-based networking standard that allows chartplotters, VHF radios, engines, depth finders, and other devices to share data seamlessly.

Question 7: What is the minimum number of ventilation openings required for a gasoline-powered engine compartment per ABYC standards?

At least two — one for intake and one for exhaust (Correct answer)
Three vents minimum
No vents required if a blower is installed
One large vent is sufficient

Correct answer: At least two — one for intake and one for exhaust

ABYC requires at least one intake and one exhaust vent to ensure adequate air circulation and dilution of fuel vapors.

Question 8: What symptom would a worn or damaged water pump impeller cause on an outboard engine?

Excessive lower unit vibration
Overheating, reduced or absent water stream from the tell-tale, and possible engine alarm (Correct answer)
Rich fuel mixture and black exhaust smoke
Hard starting and rough idle

Correct answer: Overheating, reduced or absent water stream from the tell-tale, and possible engine alarm

A failed impeller reduces cooling water flow, causing overheating that triggers the engine's thermal warning system and can cause severe engine damage.

Question 9: How does a 4-blade propeller generally differ from a 3-blade of the same pitch and diameter?

4-blade is only suitable for inboard engines
4-blade reduces fuel consumption at wide-open throttle
4-blade provides better hole shot and reduced vibration but slightly lower top speed (Correct answer)
4-blade achieves higher top speed due to reduced drag

Correct answer: 4-blade provides better hole shot and reduced vibration but slightly lower top speed

A 4-blade propeller offers better acceleration and less vibration due to increased blade area, but the added drag typically results in a slightly lower maximum top speed.

Question 10: A technician is troubleshooting a marine vessel where the battery slowly discharges overnight with no loads switched on. The FIRST step to identify the source of the parasitic draw is to:

Replace the battery and monitor for recurrence
Perform a load test on the battery
Connect an ammeter in series with the battery negative cable and systematically pull fuses until the current drops (Correct answer)
Measure voltage at each circuit breaker with a voltmeter

Correct answer: Connect an ammeter in series with the battery negative cable and systematically pull fuses until the current drops

Placing an ammeter in series on the battery negative and pulling fuses one at a time isolates which circuit is responsible for the parasitic current drain.

Question 11: During a compression test on a two-stroke outboard, what is the acceptable minimum compression reading per cylinder?

Compression testing does not apply to two-stroke engines
Exactly 120 psi on all cylinders
Above 50 psi regardless of variation
Above 90 psi and within 15% variation between cylinders (Correct answer)

Correct answer: Above 90 psi and within 15% variation between cylinders

Healthy two-stroke outboards typically produce 90–150 psi depending on the model; the critical factor is that cylinders are within 15% of each other.

Question 12: What does propeller pitch refer to in marine applications?

The theoretical distance a propeller would advance in one revolution with no slip (Correct answer)
The diameter of the circle swept by the propeller blades
The angle of the propeller shaft relative to the keel
The number of blades on the propeller

Correct answer: The theoretical distance a propeller would advance in one revolution with no slip

Pitch is the theoretical forward distance the propeller would move in one complete revolution if there were no slippage through the water, similar to a screw thread.

Question 13: A technician drains and replaces engine coolant. Under EPA regulations, used coolant is classified as what type of waste if it contains high levels of lead?

Universal waste that can be poured into any sewer
Hazardous waste requiring proper disposal under RCRA (Correct answer)
Recyclable material with no disposal restrictions
Non-regulated solid waste

Correct answer: Hazardous waste requiring proper disposal under RCRA

Used coolant contaminated with regulated metals like lead is classified as hazardous waste under RCRA and must be disposed of through a licensed hazardous waste hauler.

Question 14: A bilge pump rated at 1,500 GPH at zero head will deliver how much flow at 1 meter of head?

Significantly less than 1,500 GPH due to increased resistance (Correct answer)
Exactly 750 GPH regardless of pump type
More than 1,500 GPH because pressure assists flow
Approximately 1,500 GPH — head does not affect output

Correct 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.

Question 15: A marine vessel's tachometer reads erratically at all engine speeds. The signal wire, sender, and instrument all test good. What is the MOST likely remaining cause?

The engine is misfiring on multiple cylinders
A poor ground connection at the tachometer or sender (Correct answer)
The tachometer is incompatible with the engine's cylinder count
Radio frequency interference from the VHF radio

Correct answer: A poor ground connection at the tachometer or sender

A poor or intermittent ground connection is the most common cause of erratic gauge readings after all active components have tested good.

Question 16: What does the term 'stray current corrosion' refer to in a marine context?

Corrosion caused by AC shore power fluctuations
Corrosion caused by dissimilar metals in contact with seawater
Accelerated corrosion caused by DC electrical current leaking into the water from the vessel or marina (Correct answer)
Corrosion that occurs only in freshwater environments

Correct answer: Accelerated corrosion caused by DC electrical current leaking into the water from the vessel or marina

Stray current corrosion is caused by DC current leaking from the vessel or marina electrical systems into the water, which dramatically accelerates metal corrosion on underwater components.

Question 17: During valve adjustment on a marine engine, the technician finds one exhaust valve has zero clearance. What symptom would this most likely cause?

Hard starting due to low compression in that cylinder (Correct answer)
High oil consumption
Excessive valve train noise
Engine backfiring through the carburetor

Correct answer: Hard starting due to low compression in that cylinder

Zero valve clearance on an exhaust valve can cause it to remain slightly open, reducing compression in that cylinder and making the engine hard to start.

Question 18: What is the correct method to set ignition timing on a marine engine equipped with a mechanical distributor?

Set timing using the knock sensor feedback
Set timing at maximum RPM using a scan tool
Rotate the distributor until the engine runs smoothest at any RPM
Connect a timing light to cylinder #1 and align the timing mark at idle with vacuum advance disconnected (Correct answer)

Correct answer: Connect a timing light to cylinder #1 and align the timing mark at idle with vacuum advance disconnected

Base ignition timing is set at idle with vacuum advance hose disconnected and plugged, aligning the crankshaft timing mark with the specified degree mark using a timing light on cylinder #1.

Question 19: When installing a chartplotter/MFD on a vessel, what is the most important consideration for placement?

Visibility from the helm with minimal sun glare and within arm's reach of the operator (Correct answer)
Placing it next to the VHF radio for short cable runs
Mounting in an enclosed cabinet to protect from weather
Mounting as high as possible for GPS reception

Correct answer: Visibility from the helm with minimal sun glare and within arm's reach of the operator

The chartplotter must be readable in direct sunlight and operable without the helmsman leaning away from the wheel, per safe navigation practice.

Question 20: What is the maximum allowable fuel tank fill rate before vapor lock or overflow becomes a risk in a portable tank system?

No restriction applies to portable tanks
Fill slowly to allow vapors to escape and stop before fuel spills (Correct answer)
Never fill above 75% capacity
Fill as fast as possible to reduce exposure time

Correct answer: Fill slowly to allow vapors to escape and stop before fuel spills

Portable tanks should be filled slowly to allow vapor displacement and stopped before spilling to prevent fire and water pollution violations.

Question 21: What does a depth sounder's transducer actually measure to calculate water depth?

The time for a sonar pulse to travel to the bottom and return, converted to depth using the speed of sound in water (Correct answer)
The electrical resistance of the water column
The GPS altitude difference between surface and bottom
The water pressure at the hull

Correct answer: The time for a sonar pulse to travel to the bottom and return, converted to depth using the speed of sound in water

The transducer emits a high-frequency sound pulse and measures the time for the echo to return; depth = (time × speed of sound) ÷ 2.

Question 22: Which federal regulation requires marine fuel tanks to be certified for use in boats?

49 CFR Part 178
33 CFR Part 183 (Fuel Systems) (Correct answer)
46 CFR Part 25
40 CFR Part 86

Correct answer: 33 CFR Part 183 (Fuel Systems)

33 CFR Part 183 establishes Coast Guard standards for fuel systems on recreational boats, including tank certification requirements.

Question 23: A fuel-injected outboard has low fuel pressure at the rail. After replacing the fuel filter, pressure is still low. What is the next component to inspect?

The ignition module
The electric fuel pump (Correct answer)
The throttle position sensor
The tilt/trim relay

Correct answer: The electric fuel pump

If a new filter does not resolve low rail pressure, the electric fuel pump is likely weak or failing and should be tested for volume and pressure output.

Question 24: A marine technician performs a compression test on a 4-cylinder engine and finds cylinders 2 and 3 have equally low readings. What is the most likely cause?

Blown head gasket between cylinders 2 and 3 (Correct answer)
Worn piston rings in both cylinders
Incorrect valve timing
Stuck open intake valves on both cylinders

Correct answer: Blown head gasket between cylinders 2 and 3

Adjacent cylinders with equally low compression indicate a blown head gasket between those cylinders, allowing combustion pressure to leak between them.

Question 25: When testing a marine DC circuit for a short to ground, a technician disconnects the load and measures resistance between the positive conductor and ground. A reading of 0 ohms confirms:

The load has high internal resistance
A hard short circuit exists in the wiring between the fuse and load (Correct answer)
The ground connection is properly established
The circuit is functioning normally

Correct answer: A hard short circuit exists in the wiring between the fuse and load

Zero ohms between the positive conductor and ground with the load disconnected confirms a hard short in the wiring, meaning the positive conductor is touching the ground somewhere.

Question 26: An inboard marine engine vibrates severely at all RPMs. The engine mounts appear good. What should the technician inspect next?

Propeller for damage or imbalance (Correct answer)
Carburetor jetting
Engine oil viscosity
Distributor cap and rotor

Correct answer: Propeller for damage or imbalance

A damaged, bent, or imbalanced propeller is a leading cause of whole-RPM-range vibration in inboard installations after engine mounts are verified good.

Question 27: What is the maximum EPA-allowable ethanol content in marine gasoline sold at the pump?

10% (E10) (Correct answer)
15% (E15)
85% (E85)
20% (E20)

Correct answer: 10% (E10)

The EPA limits marine pump fuel to E10 (10% ethanol) because higher concentrations can damage marine engines and fuel system components not designed for them.

Question 28: What is the function of the helm check valves in a hydraulic steering system?

To relieve excess pressure above system rated limits
To filter contaminants from the hydraulic fluid
To set the maximum lock-to-lock turns of the steering wheel
To prevent reverse flow from the cylinder back through the helm pump (Correct answer)

Correct answer: To prevent reverse flow from the cylinder back through the helm pump

Helm check valves block reverse flow from the steering cylinder to the pump, maintaining steering position when hydraulic pressure fluctuates.

Question 29: What color is the standard fuel fill deck fitting on gasoline-powered boats to distinguish it from diesel?

Black
Red (Correct answer)
Green
Yellow

Correct answer: Red

ABYC standards specify red deck fill fittings for gasoline to prevent misfueling with diesel, which would damage gasoline engines.

Question 30: What is the required light configuration for a power-driven vessel under 12 meters underway at night under COLREGS?

Only a white all-round light
Three white lights in a vertical line
All-round white light (or masthead and stern lights) plus red and green sidelights (Correct answer)
Red and green sidelights only

Correct answer: All-round white light (or masthead and stern lights) plus red and green sidelights

Under COLREGS Rule 23, power-driven vessels under 12m may show an all-round white light and sidelights, or masthead light, sidelights, and stern light.

Question 31: What is the function of the anti-siphon valve installed on a marine fuel system?

To regulate fuel pressure to the injectors
To allow air into the tank for vapor equalization
To prevent fuel from gravity-feeding into the engine when it is not running (Correct answer)
To filter water from the fuel before it reaches the engine

Correct answer: To prevent fuel from gravity-feeding into the engine when it is not running

The anti-siphon valve closes when the engine stops to prevent raw fuel from flooding the engine or bilge via gravity flow from the tank.

Question 32: What is the primary function of a marine engine's cooling system?

To increase the engine’s power output
To regulate fuel flow through the engine
To remove excess heat and maintain proper engine temperatures (Correct answer)
To circulate coolant for engine lubrication

Correct answer: To remove excess heat and maintain proper engine temperatures

The primary function of a marine engine's cooling system is to remove excess heat generated during combustion and maintain the engine within its optimal operating temperature range. This prevents overheating, which can cause severe damage to engine components and reduce efficiency. The system typically circulates coolant (often a mixture of antifreeze and water) through the engine block and then through a heat exchanger or raw water system to dissipate the heat.

Question 33: What type of fluid is used in most marine hydraulic steering systems?

Automatic transmission fluid (ATF) or dedicated marine hydraulic steering fluid (Correct answer)
Power steering fluid only
Motor oil SAE 10W-30
Brake fluid (DOT 3)

Correct answer: Automatic transmission fluid (ATF) or dedicated marine hydraulic steering fluid

Most marine hydraulic steering systems use ATF or a manufacturer-specified hydraulic steering fluid — consult the OEM manual for the correct specification.

Question 34: What is the correct coaxial cable type for a VHF antenna installation to minimize signal loss on runs over 20 feet?

Standard RG-58
Any antenna wire rated for outdoor use
RG-8X or RG-8U (low-loss coax) (Correct answer)
RG-174 (mini coax)

Correct answer: RG-8X or RG-8U (low-loss coax)

Low-loss coaxial cable such as RG-8X significantly reduces signal attenuation over longer antenna cable runs compared to standard RG-58.

Question 35: Why is anti-seize compound applied to the splined shaft before installing a propeller?

To increase the torque capacity transmitted through the spline connection
To seal the spline against water intrusion into the shaft bearing
To prevent galvanic corrosion between dissimilar metals and ease future removal (Correct answer)
To increase friction and prevent the propeller from loosening at high RPM

Correct answer: To prevent galvanic corrosion between dissimilar metals and ease future removal

Anti-seize compound prevents galvanic corrosion where dissimilar metals contact each other (e.g., aluminum propeller on stainless shaft) and ensures the propeller can be removed without damage in the future.

Question 36: What is the purpose of a marine radar reflector installed on a small fiberglass or wooden vessel?

To reflect sunlight for daytime visibility
To protect the hull from radar waves emitted by other ships
To improve the vessel's own radar performance
To increase the vessel's radar cross-section so it appears clearly on other vessels' radar screens (Correct answer)

Correct answer: To increase the vessel's radar cross-section so it appears clearly on other vessels' radar screens

Fiberglass and wood hulls have very small radar cross-sections and may not be visible on other ships' radar; a passive reflector greatly increases the reflected signal.

Question 37: What is the purpose of maintaining a boat’s air ventilation system?

To enhance the boat's fuel efficiency
To increase the boat's interior space
To prevent overheating and reduce carbon monoxide buildup (Correct answer)
To improve the boat's speed

Correct answer: To prevent overheating and reduce carbon monoxide buildup

The purpose of maintaining a boat’s air ventilation system is to prevent overheating and reduce carbon monoxide buildup. Proper ventilation ensures a continuous flow of fresh air, which helps cool the engine compartment and prevents the accumulation of dangerous carbon monoxide (CO) fumes from engine exhaust. This is vital for both the longevity of engine components and, more critically, the health and safety of everyone on board.

Question 38: Phase separation in ethanol-blended gasoline (E10) stored in a marine tank causes what problem?

The fuel becomes richer and runs better
No problems occur with E10 in marine engines
Water and ethanol separate from the gasoline and sink, leaning out the fuel mixture (Correct answer)
Only diesel fuel is affected by phase separation

Correct answer: Water and ethanol separate from the gasoline and sink, leaning out the fuel mixture

When water is present, ethanol absorbs it and separates from the gasoline layer, creating a water-ethanol mix that can damage engines and fuel systems.

Question 39: On a stern-drive unit, what component transfers engine torque to the propeller shaft while allowing steering movement?

Universal joint (U-joint) assembly (Correct answer)
Shift actuator rod
Trim tab adjuster
Driveshaft coupler flange

Correct answer: Universal joint (U-joint) assembly

U-joints in the stern-drive allow the drive unit to pivot for steering while continuously transmitting engine torque to the propeller.

Question 40: On a marine vessel, why are bonding wires connected to through-hulls and metal underwater fittings?

To equalize electrical potential and prevent galvanic corrosion (Correct answer)
To provide an additional current return path for DC systems
To reduce electromagnetic interference from the engine
To ground the vessel's AC electrical system

Correct answer: To equalize electrical potential and prevent galvanic corrosion

Bonding equalizes the electrical potential between underwater metal fittings, preventing galvanic corrosion caused by dissimilar metals in an electrolyte.

Question 41: How do you determine whether a marine engine's spark plugs are functioning correctly?

By examining the spark plug for cracks only
By testing spark output using a spark plug tester (Correct answer)
By checking the engine's fuel consumption
By cleaning the spark plug thoroughly

Correct answer: By testing spark output using a spark plug tester

To determine if a marine engine's spark plugs are functioning correctly, the most reliable method is to test their spark output using a specialized spark plug tester. This tool allows you to visually confirm if the plug is producing a strong, consistent spark under simulated engine conditions. While examining the plug for physical damage or fouling can provide clues, a spark tester directly verifies its electrical performance, which is crucial for proper ignition.

Question 42: What does adding 'cup' to a propeller blade accomplish?

Adds a curved hook to the trailing edge to improve grip and reduce ventilation (Correct answer)
Dynamically balances the propeller at high RPM
Increases the overall weight of the propeller for better inertia
Reduces the effective diameter without changing pitch

Correct answer: Adds a curved hook to the trailing edge to improve grip and reduce ventilation

Cup is a curved trailing edge on propeller blades that improves water grip, reduces ventilation and cavitation, and helps the engine maintain rated RPM.

Question 43: What causes a boat to 'prop walk' sideways when shifted into reverse?

The asymmetric thrust pattern created by the propeller's rotation in reverse (Correct answer)
Ventilation drawing exhaust gases under the hull
Cavitation on the pressure face of the blades in reverse
The pitch angle of the blades reversing to a negative angle

Correct answer: The asymmetric thrust pattern created by the propeller's rotation in reverse

In reverse, a single-rotation propeller creates an asymmetric thrust pattern (similar to P-factor) because blade loading differs between the top and bottom arcs of rotation, pushing the stern sideways.

Question 44: According to ABYC standards, what is the maximum allowable AC voltage drop on a shore power cord and inlet connection under full rated load?

10% of supply voltage
3% of supply voltage (Correct answer)
1% of supply voltage
5% of supply voltage

Correct answer: 3% of supply voltage

ABYC E-11 limits shore power conductor voltage drop to 3% or less to protect onboard equipment from undervoltage damage.

Question 45: What USCG-required channel must all recreational vessels monitor when operating in US waters?

VHF Channel 9
VHF Channel 22A
VHF Channel 16 (Correct answer)
VHF Channel 6

Correct answer: VHF Channel 16

VHF Channel 16 is the international distress, safety, and calling channel; all recreational vessels are required to monitor it while underway.

Question 46: What is the recommended approach for repairing a through-hull fitting that has corroded and is leaking?

Tighten the backing nut until the leak stops
Haul the vessel and replace the fitting with a properly sized bronze or composite unit (Correct answer)
Apply underwater epoxy putty from the inside while the vessel is afloat
Cap the fitting from outside with fiberglass tape

Correct answer: Haul the vessel and replace the fitting with a properly sized bronze or composite unit

A corroded through-hull is a serious safety risk and must be replaced with a properly rated fitting after hauling the vessel out of the water.

Question 47: What is the proper way to dispose of water-contaminated fuel removed from a marine tank?

Take it to a certified hazardous waste facility or marina fuel recycler (Correct answer)
Dump it on land away from the water
Burn it off in a controlled campfire
Pour it into the bilge and pump it out

Correct answer: Take it to a certified hazardous waste facility or marina fuel recycler

Contaminated fuel is hazardous waste and must be disposed of at an approved facility — dumping it overboard or on land is a federal violation.

Question 48: Why is regular maintenance of a boat’s engine cooling system important?

It improves the engine’s exhaust system
It reduces the engine’s fuel consumption
It increases the engine's horsepower
It prevents overheating and ensures the engine runs efficiently (Correct answer)

Correct answer: It prevents overheating and ensures the engine runs efficiently

Regular maintenance of a boat’s engine cooling system is vital because it prevents overheating and ensures the engine runs efficiently. The cooling system dissipates the heat generated during engine operation, keeping temperatures within safe limits. Neglecting maintenance can lead to blockages, leaks, or component failures, resulting in engine overheating, which can cause severe and costly damage.

Question 49: Why is it important to inspect a boat’s electrical system?

It increases the overall speed of the boat
It helps improve the boat's fuel economy
It ensures safe operation of the boat’s electrical components (Correct answer)
It improves the boat's aesthetic appearance

Correct answer: It ensures safe operation of the boat’s electrical components

Inspecting a boat’s electrical system is important because it ensures the safe operation of all the boat’s electrical components. From navigation lights and communication systems to engine starting and bilge pumps, a reliable electrical system is crucial for safety and functionality. Regular checks help identify potential issues like corrosion, loose connections, or damaged wiring, preventing failures, short circuits, or even fires.

Question 50: What physical process causes the characteristic pitting (erosion) seen on cavitating propeller blades?

Chemical corrosion from saltwater dissolving the blade surface
Electrolytic action between dissimilar metals in the propeller assembly
Sand and grit abrasion from running in shallow coastal waters
Micro-shockwaves from the violent collapse of vapor bubbles on the blade surface (Correct answer)

Correct answer: Micro-shockwaves from the violent collapse of vapor bubbles on the blade surface

Cavitation erosion pitting is caused by the violent collapse of vapor bubbles on the blade surface, generating intense micro-shockwaves that mechanically remove material from the metal.

Question 51: Which test best verifies the integrity of a marine fuel tank after a repair or installation?

Sniff test for fuel vapors
Pressure test at the ABYC-specified level (typically 3 psi for 1 minute) (Correct answer)
Fill the tank and check for 24 hours
Visual inspection of all welds

Correct answer: Pressure test at the ABYC-specified level (typically 3 psi for 1 minute)

ABYC H-24 requires portable and permanent fuel tanks to pass a pressure test at 3 psi for at least 1 minute without leakage.

Question 52: What is the maximum distance at which two VHF radios at sea level can typically communicate using line-of-sight propagation?

500 nautical miles
Unlimited range in calm conditions
100 nautical miles reliably
Approximately 20–25 nautical miles between two vessels depending on antenna height (Correct answer)

Correct answer: Approximately 20–25 nautical miles between two vessels depending on antenna height

VHF radio is line-of-sight, and the range between vessels is limited by antenna height above the waterline — typically 20–25 nm vessel-to-vessel at normal antenna heights.

Question 53: What type of propeller material is generally most susceptible to corrosion in a saltwater environment?

Stainless steel
Nibral (nickel-bronze-aluminum alloy)
Bronze
Aluminum (Correct answer)

Correct answer: Aluminum

Aluminum propellers corrode much more rapidly than stainless or bronze in salt water, especially when the sacrificial anode is depleted.

Question 54: A shore power inlet on a vessel shows no power at the main panel despite shore power being connected. The technician confirms 120V at the inlet receptacle. What should be checked NEXT?

The shore power circuit breaker and reverse polarity indicator (Correct answer)
The battery charger output voltage
All DC circuit breakers
The galvanic isolator

Correct answer: The shore power circuit breaker and reverse polarity indicator

The shore power circuit breaker at the main panel is the next logical component to check, and the reverse polarity indicator confirms correct wiring.

Question 55: What does the term 'waypoint' mean in marine navigation?

A specific set of GPS coordinates saved in a chartplotter as an intermediate or destination point (Correct answer)
The speed at which a vessel can safely navigate in a channel
A depth contour line on a nautical chart
The maximum radar range setting

Correct answer: A specific set of GPS coordinates saved in a chartplotter as an intermediate or destination point

A waypoint is a latitude/longitude coordinate stored in the GPS chartplotter that the navigator uses to plot a course or mark a location of interest.

Question 56: What is the correct process for removing a seized propeller from an outboard shaft?

Apply penetrating oil, wait, then use a prop puller or wooden block with mallet — never use heat near seals (Correct answer)
Use an impact wrench to spin the prop off
Heat the prop hub with an oxy-acetylene torch to expand it
Strike the prop blade directly with a hammer

Correct answer: Apply penetrating oil, wait, then use a prop puller or wooden block with mallet — never use heat near seals

Penetrating oil and a proper prop puller safely remove a seized prop without damaging the shaft threads or seals — heat or striking can cause serious damage.

Question 57: What is the role of a bilge pump in maintaining environmental safety on a boat?

To filter air entering the cabin
To remove water and contaminants from the bilge (Correct answer)
To circulate water in the cooling system
To increase fuel consumption

Correct answer: To remove water and contaminants from the bilge

A bilge pump is a critical safety device designed to remove water that accumulates in the lowest part of a boat, known as the bilge. This prevents the vessel from becoming unstable or sinking due to excess water. By expelling water and any contaminants like oil or fuel, it also plays a vital role in preventing marine pollution and maintaining environmental safety.

Question 58: Which symptom indicates a marine engine's timing chain or belt has jumped one tooth?

Engine stalls when put in gear
Loss of power with backfire through intake or exhaust at specific RPM (Correct answer)
Engine misfires only at idle
Excessive valve train noise at cold start

Correct answer: Loss of power with backfire through intake or exhaust at specific RPM

A jumped timing chain shifts cam timing, causing valve events to occur out of synchronization with piston position, resulting in power loss and backfiring at specific RPM ranges.

Question 59: A customer's outboard motor leaks a quart of oil into a marina slip. As the servicing technician, what is your FIRST obligation under federal law?

Wait to see if natural dispersion eliminates the sheen within one hour
Notify the marina harbormaster only, no federal report required
Immediately contain the spill and report it to the National Response Center if it causes a sheen (Correct answer)
File a written report with the EPA within 30 days

Correct answer: Immediately contain the spill and report it to the National Response Center if it causes a sheen

Any oil discharge that causes a sheen on navigable waters must be reported immediately to the National Response Center (1-800-424-8802) under 33 USC 1321.

Question 60: What should be checked during the routine maintenance of a boat’s steering system?

The interior upholstery
The exhaust system
The fuel tank’s condition
The steering cables, fluid levels, and rudder operation (Correct answer)

Correct answer: The steering cables, fluid levels, and rudder operation

During routine maintenance of a boat’s steering system, it is crucial to check the steering cables, fluid levels (for hydraulic systems), and rudder operation. The steering system is paramount for safe navigation and control. Inspecting for wear, corrosion, leaks, or looseness in these components ensures that the boat responds accurately to steering input, preventing loss of control and ensuring safety on the water.

Question 61: Under EPA Tier 3 marine engine emission standards, which pollutant has the most stringent new reduction requirements compared to Tier 2?

Particulate matter (PM) and NOx combined (Correct answer)
Carbon dioxide (CO2) only
Hydrocarbon (HC) only
Carbon monoxide (CO) only

Correct answer: Particulate matter (PM) and NOx combined

EPA Tier 3 standards for marine diesel engines significantly tightened combined NOx + PM (particulate matter) limits compared to Tier 2.

Question 62: A technician uses an oscilloscope to analyze a marine engine's primary ignition waveform and notices the burn time is shorter than specification. What does this indicate?

Advanced ignition timing
Weak ignition coil primary winding
Excessive rotor gap in the distributor
Too low a spark plug gap or fouled plugs (Correct answer)

Correct answer: Too low a spark plug gap or fouled plugs

Short burn time on the primary waveform indicates the spark is not sustaining long enough, typically caused by a spark plug gap that is too small or plugs that are fouled and offer less resistance.

Question 63: A marine technician replaces a fuel tank vent fitting. Under ABYC H-24, what is required of the vent outlet to prevent fire or explosion?

The vent can terminate anywhere in the bilge for easy servicing
The vent must terminate outboard and away from ignition sources, with a flame arrester screen (Correct answer)
The vent must be sealed and only opened during fueling
No screen is required if the vent terminates above the waterline

Correct answer: The vent must terminate outboard and away from ignition sources, with a flame arrester screen

ABYC H-24 requires fuel tank vents to terminate outboard in a location away from ignition sources and to be fitted with a corrosion-resistant flame arrester screen.

Question 64: Which material is most commonly used for recreational boat propellers?

Cast iron
Titanium
Aluminum alloy (Correct answer)
Stainless steel

Correct answer: Aluminum alloy

Aluminum alloy is the most common propeller material for recreational boats due to its low cost, light weight, and ease of repair after minor strikes.

Question 65: A twin-engine boat with hydraulic steering pulls strongly to one side at rest but steers normally under power. The most likely cause is:

Worn steering wheel hub
A seized port engine throttle cable
Unequal engine trim angle between the two engines (Correct answer)
Low hydraulic fluid in the port side cylinder

Correct answer: Unequal engine trim angle between the two engines

Unequal trim angles cause an asymmetric thrust vector at rest that corrects under power as hydrodynamic forces equalize.

Question 66: A technician measures resistance between the vessel's DC negative bus and the engine block and finds 0 ohms. What does this indicate?

Normal wiring in a negative-ground DC system (Correct answer)
An AC ground fault has occurred
A dangerous fault that must be corrected immediately
The bonding system is functioning correctly

Correct answer: Normal wiring in a negative-ground DC system

In a negative-ground DC system, the engine block serves as the ground reference, so 0 ohms between the DC negative bus and engine block is the correct, expected condition.

Question 67: Why is it important to verify grounding in a marine electrical system?

Grounding is only important for aesthetic purposes
Grounding improves the engine's performance
Grounding ensures safe electrical current flow and prevents damage (Correct answer)
Grounding reduces the fuel consumption

Correct answer: Grounding ensures safe electrical current flow and prevents damage

Verifying proper grounding in a marine electrical system is critically important because it ensures safe electrical current flow and prevents damage. A robust ground connection provides a safe return path for electricity, preventing stray currents that can cause galvanic corrosion to metal components of the boat. Proper grounding is essential for the reliable operation of all electrical devices and for protecting against electrical shocks and equipment failure.

Question 68: A two-stroke outboard engine is drawing in air through the fuel system; which component is the most likely cause?

Cracked or deteriorated fuel line or primer bulb (Correct answer)
Faulty tachometer sensor
Clogged fuel filter
Stuck choke plate

Correct answer: Cracked or deteriorated fuel line or primer bulb

Air infiltration in a two-stroke fuel system is almost always caused by cracked fuel lines, a deteriorated primer bulb check valve, or a loose fitting.

Question 69: When flushing a saltwater outboard engine after use, what is the correct procedure?

Pour fresh water into the carburetor with the engine off
Attach a flush muff to the water intakes with the engine running in neutral and flush with fresh water for 5–10 minutes (Correct answer)
Spray the exterior with a garden hose — no need to flush internally
Run the engine at full throttle in a lake for 10 minutes

Correct answer: Attach a flush muff to the water intakes with the engine running in neutral and flush with fresh water for 5–10 minutes

Running the engine with a flush muff circulates fresh water through the entire cooling system to remove salt deposits that cause corrosion and blockage.

Question 70: When replacing a fuel filter on an EFI outboard engine, what precaution must be taken before disconnecting fuel lines?

Relieve fuel system pressure by running the engine until it stalls or using the service manual procedure (Correct answer)
No special precaution is needed for EFI systems
Disconnect the battery only
Remove the fuel cap to vent the tank

Correct answer: Relieve fuel system pressure by running the engine until it stalls or using the service manual procedure

EFI systems maintain residual pressure in the fuel rail; pressure must be relieved before disconnecting lines to prevent fuel spray and fire risk.

Question 71: Which wiring method is REQUIRED by ABYC standards for marine DC wiring installed below decks?

Aluminum conductors for weight savings
Tinned copper conductors to resist corrosion in the marine environment (Correct answer)
Twisted pair conductors to reduce electromagnetic interference
Single conductor wire with individual grounding

Correct answer: Tinned copper conductors to resist corrosion in the marine environment

ABYC standards require tinned copper conductors for marine wiring because the tin plating resists the corrosion caused by the marine environment's moisture and salt air.

Question 72: When bleeding a hydraulic steering system, what is the correct procedure?

Run the engine at full throttle to build pressure
Remove the cylinder bleeder screw and fill from the cylinder
Add fluid only when the engine is running at idle
Turn the helm lock-to-lock multiple times while adding fluid at the reservoir until no air bubbles appear (Correct answer)

Correct answer: Turn the helm lock-to-lock multiple times while adding fluid at the reservoir until no air bubbles appear

Cycling the helm lock-to-lock while topping off the reservoir forces air out of the system and allows fluid to fill all passages.

Question 73: What is the primary purpose of a bilge pump float switch circuit's fuse protection?

To prevent reverse polarity damage to the float switch
To protect the boat's wiring from short circuits in the bilge pump circuit (Correct answer)
To prevent the bilge pump motor from overloading and overheating
To limit the maximum run time of the bilge pump

Correct answer: To protect the boat's wiring from short circuits in the bilge pump circuit

The fuse protects the vessel's wiring from damage caused by a short circuit in the bilge pump circuit, preventing fire hazards.

Question 74: How do you prevent corrosion in a marine engine's electrical components?

By regularly inspecting, cleaning, and applying dielectric grease (Correct answer)
By increasing the engine’s electrical current
By sealing all components with duct tape
By using non-waterproof connectors

Correct answer: By regularly inspecting, cleaning, and applying dielectric grease

To prevent corrosion in a marine engine's electrical components, it is essential to regularly inspect, clean, and apply dielectric grease. The marine environment, with its saltwater and humidity, is highly corrosive. Regular inspection allows for early detection of corrosion, cleaning removes corrosive agents, and dielectric grease creates a protective barrier against moisture and salt, ensuring good electrical contact and extending component lifespan.

Question 75: What is the primary purpose of a sacrificial zinc anode installed on a propeller shaft or strut?

To dynamically balance the propeller at operating speeds
To lubricate the shaft cutlass bearing and reduce wear
To dampen shaft vibration transmitted to the hull
To corrode preferentially and protect the propeller and shaft from galvanic corrosion (Correct answer)

Correct answer: To corrode preferentially and protect the propeller and shaft from galvanic corrosion

Zinc is less noble than aluminum, bronze, or stainless steel in the galvanic series, so it corrodes preferentially when connected to those metals in an electrolyte, protecting the more valuable components.

Question 76: Under 33 CFR 159, what size recreational vessel is required to have a Type I, II, or IV marine sanitation device (MSD) to manage sewage?

Only commercial vessels, not recreational boats
Vessels with installed toilets, regardless of length (Correct answer)
Vessels over 26 feet with more than 2 heads
Only vessels over 65 feet in length

Correct answer: Vessels with installed toilets, regardless of length

Any vessel (recreational or commercial) equipped with an installed toilet must have an approved MSD under 33 CFR 159, regardless of vessel length.

Question 77: What alloy is a 'nibral' marine propeller made from?

Non-corrosive iron-based alloy
Nickel, iron, and brass
Nickel, bronze, and aluminum (Correct answer)
Nib rubber composite and aluminum

Correct answer: Nickel, bronze, and aluminum

Nibral is an alloy of nickel, bronze (copper-tin alloy), and aluminum, prized for its high strength, excellent corrosion resistance, and use in demanding marine applications.

Question 78: What is the correct orientation for mounting an octahedral passive radar reflector?

Flat and horizontal
With one point facing directly up
Any orientation — octahedral reflectors are omnidirectional regardless of mounting
In the 'catch-rain' position with one cavity facing up (Correct answer)

Correct answer: In the 'catch-rain' position with one cavity facing up

The 'catch-rain' orientation with one open cavity facing upward maximizes the radar cross-section by presenting trihedral corner reflectors optimally toward the horizon.

Question 79: What is the purpose of a marine VHF radio's DSC (Digital Selective Calling) feature?

To communicate privately on a digital channel
To receive weather forecasts automatically
To track AIS targets on a chartplotter
To transmit a digital distress alert with vessel identity and GPS position to the Coast Guard and nearby vessels (Correct answer)

Correct answer: To transmit a digital distress alert with vessel identity and GPS position to the Coast Guard and nearby vessels

DSC allows a single button press to broadcast a digital Mayday containing the vessel's MMSI number and GPS coordinates to rescue authorities.

Question 80: What minimum AWG wire size is generally required for a VHF marine radio installation drawing up to 6 amps?

18 AWG (with a 7-amp in-line fuse at the source) (Correct answer)
24 AWG
8 AWG
12 AWG

Correct answer: 18 AWG (with a 7-amp in-line fuse at the source)

ABYC E-11 specifies wire gauges based on current load and length; 18 AWG is acceptable for short runs under 7 amps with proper fusing.

Question 81: Which type of marine battery is best suited for deep-cycle house bank service?

AGM deep-cycle battery (Correct answer)
Standard automotive battery
Cranking (SLI) battery
Lithium cranking battery

Correct answer: AGM deep-cycle battery

AGM deep-cycle batteries tolerate repeated discharge/recharge cycles and are designed for sustained loads rather than high-burst starting.

Question 82: Ethanol in marine fuel is known to degrade what common fuel system component?

Aluminum fuel tanks
Stainless steel fuel fittings
Rubber fuel lines and carburetor diaphragms (Correct answer)
Nylon primer bulbs only

Correct answer: Rubber fuel lines and carburetor diaphragms

Ethanol swells and deteriorates older rubber fuel lines, gaskets, and carburetor diaphragms not designed for alcohol-blended fuels.

Question 83: What is the recommended action when a marine fuel system shows signs of phase-separated ethanol-blended fuel?

Add a fuel stabilizer and run the engine at high RPM
Drain and replace the fuel, then clean the tank and fuel system components (Correct answer)
Mix in additional ethanol to re-blend the fuel
Add isopropyl alcohol to absorb the water layer

Correct answer: Drain and replace the fuel, then clean the tank and fuel system components

Phase-separated fuel must be discarded because the water-ethanol layer can cause corrosion and lean running; the tank should be cleaned before refilling.

Question 84: What is the correct procedure to test a fuel system for leaks after a repair?

Run the engine and smell for fuel
Use an open flame near fittings to reveal vapor
Pressurize with air to no more than 3 psi and check fittings with soapy water (Correct answer)
Fill tank and visually inspect only

Correct answer: Pressurize with air to no more than 3 psi and check fittings with soapy water

A low-pressure air test (max 3 psi) with soapy water applied to fittings safely reveals leaks without the fire risk of using fuel.

Question 85: What is the correct way to terminate an NMEA 2000 backbone cable to prevent signal reflections?

Install a 50-ohm terminator at one end only
Install 120-ohm terminator caps at both ends of the backbone (Correct answer)
Connect both ends of the backbone to a ground point
Leave both ends of the backbone open

Correct answer: Install 120-ohm terminator caps at both ends of the backbone

NMEA 2000 CAN bus networks require 120-ohm terminators at each end of the backbone to match impedance and prevent data signal reflections.

Question 86: What is the purpose of having a fire suppression system on a boat?

To increase the boat’s fuel consumption
To suppress fires quickly and protect passengers and the boat (Correct answer)
To enhance the boat’s speed
To improve the boat's engine performance

Correct answer: To suppress fires quickly and protect passengers and the boat

A fire suppression system is a vital safety feature on a boat, where the risk of fire from fuel, electrical systems, or engines is significant. Its purpose is to detect and extinguish fires rapidly, often automatically, to minimize damage to the vessel. Most importantly, it ensures the safety and survival of passengers and crew by preventing uncontrolled fires.

Question 87: A NMEA 0183 sentence that begins with '$GPRMC' contains what information?

Recommended minimum specific GPS/transit data including time, position, speed, and course (Correct answer)
Engine RPM and oil pressure data
Depth sounder readings
Wind speed and direction

Correct answer: Recommended minimum specific GPS/transit data including time, position, speed, and course

The GPRMC sentence is one of the most common NMEA 0183 sentences and contains position, speed over ground, course, date, and magnetic variation.

Question 88: What is the purpose of the thrust bearing in a propeller shaft system?

To absorb and transfer the propeller's axial thrust force to the engine mounts and hull (Correct answer)
To align the propeller shaft angle with the engine output flange
To prevent the propeller shaft from spinning when the engine is in neutral
To reduce friction between the rotating propeller and surrounding water

Correct answer: To absorb and transfer the propeller's axial thrust force to the engine mounts and hull

The thrust bearing transmits the propeller's forward or reverse axial thrust force from the rotating shaft to the engine mounts and ultimately to the hull, propelling the boat.

Question 89: Under ABYC standards, what is the minimum ventilation requirement for a gasoline engine compartment to prevent explosive vapor accumulation?

A blower that runs only while the engine is operating
One powered exhaust blower capable of moving the compartment volume at least once per minute (Correct answer)
Two passive vents with a combined area of at least 5 square inches
No specific requirement if the compartment has a bilge drain

Correct answer: One powered exhaust blower capable of moving the compartment volume at least once per minute

ABYC and USCG regulations require at least one powered exhaust blower capable of exchanging the compartment air volume at least once per minute before starting the engine.

Question 90: What is propeller rake?

The angle at which propeller blades are swept forward or backward relative to a perpendicular plane through the shaft (Correct answer)
The ratio of blade area to total propeller disc area
The degree of trailing-edge cup added to each blade
The angle of the propeller shaft measured below horizontal

Correct answer: The angle at which propeller blades are swept forward or backward relative to a perpendicular plane through the shaft

Rake is the fore-and-aft sweep angle of propeller blades relative to a plane perpendicular to the shaft, affecting bow lift, ventilation resistance, and overall performance.

Question 91: When installing a depth transducer on a fiberglass hull, what is the recommended mounting location for best performance?

On the hull inside or outside, aft of the keel, in a location that remains submerged at all speeds and free of turbulence (Correct answer)
On the bow for forward-looking depth
On the transom directly above the waterline
On the hull beside the engine intakes

Correct answer: On the hull inside or outside, aft of the keel, in a location that remains submerged at all speeds and free of turbulence

The transducer must be submerged in clean, non-turbulent water at all speeds — turbulence from the keel or hull features causes signal loss.

Question 92: What effect does increasing propeller diameter have on engine performance?

Has no measurable effect if pitch remains constant
Increases thrust and torque load but typically reduces maximum RPM (Correct answer)
Increases RPM while decreasing torque load on the engine
Decreases thrust while allowing higher top speed

Correct answer: Increases thrust and torque load but typically reduces maximum RPM

A larger diameter propeller displaces more water per revolution, increasing thrust and the torque load on the engine, which typically prevents the engine from reaching maximum RPM.

Question 93: An EFI marine engine idle mixture cannot be adjusted with the idle air control valve at its limits. What should the technician check?

Intake manifold vacuum leaks or air leaks after the mass airflow sensor (Correct answer)
Fuel injector pulse width at idle
Throttle position sensor calibration
Idle RPM set screw position

Correct answer: Intake manifold vacuum leaks or air leaks after the mass airflow sensor

When the IAC is at its limit and cannot correct idle mixture, unmetered air entering after the MAF sensor is a common cause, as the ECU cannot account for this additional air in its fuel calculations.

Question 94: A marine autopilot system that is hunting (constantly steering back and forth past the desired heading) requires what adjustment?

Recalibrate the GPS antenna
Replace the compass sensor
Increase the sea state (rudder gain) to maximum
Reduce the rudder gain (sensitivity) setting (Correct answer)

Correct answer: Reduce the rudder gain (sensitivity) setting

Hunting occurs when the rudder gain is set too high, causing the autopilot to overcorrect — reducing gain allows more damping and a steady course.

Question 95: Why is it important to inspect the marine engine’s exhaust system?

To improve the fuel economy
To ensure the engine runs faster
To prevent blockages or leaks that affect engine performance and safety (Correct answer)
To clean the exhaust system thoroughly

Correct answer: To prevent blockages or leaks that affect engine performance and safety

Inspecting the marine engine’s exhaust system is critical for both engine performance and safety. Blockages, such as carbon buildup, can restrict exhaust flow, reducing engine efficiency and potentially causing overheating. More importantly, leaks in the exhaust system can allow dangerous carbon monoxide fumes to enter the boat's cabin, posing a severe health risk to occupants. Regular checks ensure proper gas expulsion and prevent these hazards.

Question 96: What is the correct procedure for removing a stuck aluminum propeller from a splined shaft?

Use a torch to heat the hub and tap the sides with a hammer
Use an impact wrench directly on the propeller blades
Apply grease and run the engine briefly in reverse
Use a propeller puller or soak with penetrating oil and tap gently (Correct answer)

Correct answer: Use a propeller puller or soak with penetrating oil and tap gently

A propeller puller or penetrating oil with gentle tapping is the correct approach to avoid damaging the splined shaft or distorting the propeller hub.

Question 97: Why must marine carburetors have a backfire flame arrestor?

To prevent engine backfires from igniting fuel vapors in the bilge (Correct answer)
To increase fuel efficiency
To filter debris from entering the carburetor
To reduce emissions to meet EPA standards

Correct answer: To prevent engine backfires from igniting fuel vapors in the bilge

A backfire flame arrestor stops flames from a carburetor backfire from reaching fuel vapors that may have accumulated in the engine compartment or bilge.

Question 98: A marine diesel engine suddenly emits excessive black smoke under load. Which condition does this most likely indicate?

Gear lube contaminating the fuel
Crankcase ventilation failure
Coolant leak into the combustion chamber
Air filter restriction or turbocharger inefficiency causing incomplete combustion (Correct answer)

Correct answer: Air filter restriction or turbocharger inefficiency causing incomplete combustion

Black smoke indicates a rich mixture — more fuel than available air — commonly caused by a clogged air filter or failing turbocharger reducing boost.

Question 99: What is propeller slip?

The difference between theoretical speed based on pitch and actual boat speed (Correct answer)
Hub failure allowing the propeller to spin freely under high torque
The lateral movement of the propeller shaft under load
Loss of pitch when the propeller strikes a submerged object

Correct answer: The difference between theoretical speed based on pitch and actual boat speed

Propeller slip is the difference between theoretical speed (pitch × RPM) and actual boat speed, expressed as a percentage, representing inefficiency in the propeller's grip on water.

Question 100: What is a counter-rotating propeller system?

A variable-pitch propeller that reverses blade angle to go astern
A single propeller designed with asymmetric blades to prevent ventilation
Twin propellers on concentric shafts rotating in opposite directions to cancel torque effects (Correct answer)
A system where the propeller freewheels when the engine is in neutral gear

Correct answer: Twin propellers on concentric shafts rotating in opposite directions to cancel torque effects

Counter-rotating systems use two propellers on concentric shafts spinning in opposite directions, which cancels torque and P-factor effects, improving efficiency and reducing steering pull.

Marine Service Technician Certification Exam

This exam certifies technicians in the diagnosis, repair, and maintenance of marine engines and systems.

100

Questions

120 min

Time Limit

70%

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