ASA 106 – ADVANCED COASTAL CRUISING PRACTICE
EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
Advanced Boat Systems, Diesel & Electrical (Q1–25)
1. When preparing to inspect and service the raw-water cooling system on a diesel
engine, which of the following sequences best describes the correct and safe
procedure to follow?
A. Start the engine, remove the raw-water strainer, then check for leaks
B. Shut off the engine, close the seacock, remove and clean the strainer, then restart
C. Leave the seacock open, flush with fresh water, and ignore the strainer
D. Run the engine at full RPM while cleaning the raw-water intake
Closing the seacock prevents flooding; cleaning the strainer avoids overheating.
2. If a diesel engine starts but then quickly stalls and will not restart, which of the
following is the most likely cause that should be investigated first by a prudent
skipper?
A. The propeller is damaged and causing excessive drag on the engine
B. There is air in the fuel lines or a blocked fuel supply to the injection pump
C. The alternator belt is loose and not charging the batteries properly
D. The freshwater cooling system is low on antifreeze and causing overheating
Air or fuel blockage is the most common cause of diesel stalling.
3. While underway, you notice black smoke coming from the exhaust and a loss of
power, so which of the following actions should you take first to protect the engine
and diagnose the problem?
A. Increase throttle to clear the smoke and restore full power immediately
B. Reduce throttle, check the load and fuel system, and inspect for over-fueling or
restriction
,C. Shut down the engine immediately and abandon ship until help arrives
D. Ignore the smoke and continue at the same speed to reach your destination
Black smoke indicates incomplete combustion; reducing load helps prevent damage.
4. When checking the DC electrical system on a cruising sailboat, which of the
following statements best describes the correct method for verifying that the battery
bank is being properly charged by the engine?
A. Start the engine and assume the batteries are charging without further verification
B. Start the engine, let it reach normal operating RPM, then check voltage at the
batteries
C. Run the engine at idle only and measure voltage at the main switch panel
D. Turn off all loads and measure voltage with the engine off to determine charging
Alternators need sufficient RPM; voltage should rise when charging correctly.
5. If you suspect that the raw-water impeller has failed and the engine is overheating,
which of the following is the most appropriate immediate action to take while still
underway?
A. Continue at full speed to reach port before the engine seizes completely
B. Reduce throttle, shut down the engine if temperature continues to rise, and
investigate
C. Add more coolant to the freshwater system and ignore the raw-water side entirely
D. Open the seacock wider to force more water through the overheating engine
Impeller failure stops cooling; reducing load and shutting down prevents damage.
6. When connecting the boat to shore power at a marina, which of the following
checks should you perform first to ensure that the AC electrical system is safe to
energize?
A. Plug in the shore cord immediately and turn on all AC appliances at once
B. Verify that the shore pedestal voltage and frequency match the boat's AC system
ratings
,C. Start the engine and run the generator before connecting to shore power
D. Turn on the inverter and assume the shore power is compatible without checking
Mismatched voltage or frequency can damage equipment and create fire hazards.
7. While troubleshooting a DC circuit that has lost power, which of the following
sequences best describes a logical and safe method for isolating the fault without
creating additional electrical problems?
A. Replace all fuses and breakers immediately without checking for shorts or overloads
B. Check the main breaker, then individual breakers, then test for voltage at key
points
C. Bypass all breakers and wire the circuit directly to the battery to restore power
D. Turn off all loads, then randomly reconnect circuits until the problem disappears
Systematic checking isolates faults without risking further damage or fire.
8. If the engine oil pressure warning light comes on while you are motoring in calm
conditions, which of the following is the best immediate action to protect the engine
from serious damage?
A. Increase RPM to build more oil pressure and continue to your destination
B. Reduce throttle immediately, check the oil level, and shut down if pressure does
not return
C. Ignore the light and assume the sensor is faulty because the engine sounds normal
D. Add more fuel to the tank to reduce engine load and restore oil pressure
Low oil pressure can quickly destroy an engine; immediate action is critical.
9. When preparing to replace a fuel filter on a diesel engine, which of the following
procedures best ensures that you minimize air introduction into the fuel system and
avoid subsequent starting problems?
A. Remove the old filter quickly and install the new one without bleeding the system
B. Shut off the fuel supply, replace the filter, then bleed air according to the manual
C. Run the engine at high RPM while swapping filters to keep fuel flowing continuously
D. Leave the fuel supply open and allow diesel to spill freely while changing the filter
, Proper bleeding prevents airlocks that can stop the engine from starting.
10. If you notice that the bilge pump is running continuously even though there is no
obvious water in the bilge, which of the following is the most likely electrical fault
that should be investigated first?
A. The pump motor is oversized and requires a larger fuse to operate correctly
B. The float switch is stuck in the closed position or the wiring is shorted
C. The battery bank is overcharged and forcing the pump to run without need
D. The raw-water cooling system is leaking directly into the bilge pump housing
A stuck float or short will keep the pump energized continuously.
11. When inspecting the sacrificial zinc anodes on the propeller and underwater
fittings, which of the following observations would indicate that the anodes are
functioning correctly and protecting the metal?
A. The zincs are completely intact with no visible corrosion after a full season
B. The zincs show gradual, even corrosion and are partially consumed over time
C. The zincs are cracked and flaking but still attached to the underwater fittings
D. The zincs are painted over to prevent corrosion and extend their service life
Zincs should corrode sacrificially; even wear shows they are protecting other metals.
12. If the engine cooling system temperature gauge shows a steady rise while
motoring, but the raw-water strainer is clean and the seacock is fully open, which of
the following should you check next?
A. The fuel tank level and quality to ensure the engine is not over-fueling
B. The raw-water impeller condition and the exhaust elbow for blockage or restriction
C. The DC electrical system voltage to confirm the alternator is charging properly
D. The freshwater tank level and pressure to ensure the domestic system is working
Impeller wear or exhaust blockage commonly causes overheating despite clean strainers.
EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
Advanced Boat Systems, Diesel & Electrical (Q1–25)
1. When preparing to inspect and service the raw-water cooling system on a diesel
engine, which of the following sequences best describes the correct and safe
procedure to follow?
A. Start the engine, remove the raw-water strainer, then check for leaks
B. Shut off the engine, close the seacock, remove and clean the strainer, then restart
C. Leave the seacock open, flush with fresh water, and ignore the strainer
D. Run the engine at full RPM while cleaning the raw-water intake
Closing the seacock prevents flooding; cleaning the strainer avoids overheating.
2. If a diesel engine starts but then quickly stalls and will not restart, which of the
following is the most likely cause that should be investigated first by a prudent
skipper?
A. The propeller is damaged and causing excessive drag on the engine
B. There is air in the fuel lines or a blocked fuel supply to the injection pump
C. The alternator belt is loose and not charging the batteries properly
D. The freshwater cooling system is low on antifreeze and causing overheating
Air or fuel blockage is the most common cause of diesel stalling.
3. While underway, you notice black smoke coming from the exhaust and a loss of
power, so which of the following actions should you take first to protect the engine
and diagnose the problem?
A. Increase throttle to clear the smoke and restore full power immediately
B. Reduce throttle, check the load and fuel system, and inspect for over-fueling or
restriction
,C. Shut down the engine immediately and abandon ship until help arrives
D. Ignore the smoke and continue at the same speed to reach your destination
Black smoke indicates incomplete combustion; reducing load helps prevent damage.
4. When checking the DC electrical system on a cruising sailboat, which of the
following statements best describes the correct method for verifying that the battery
bank is being properly charged by the engine?
A. Start the engine and assume the batteries are charging without further verification
B. Start the engine, let it reach normal operating RPM, then check voltage at the
batteries
C. Run the engine at idle only and measure voltage at the main switch panel
D. Turn off all loads and measure voltage with the engine off to determine charging
Alternators need sufficient RPM; voltage should rise when charging correctly.
5. If you suspect that the raw-water impeller has failed and the engine is overheating,
which of the following is the most appropriate immediate action to take while still
underway?
A. Continue at full speed to reach port before the engine seizes completely
B. Reduce throttle, shut down the engine if temperature continues to rise, and
investigate
C. Add more coolant to the freshwater system and ignore the raw-water side entirely
D. Open the seacock wider to force more water through the overheating engine
Impeller failure stops cooling; reducing load and shutting down prevents damage.
6. When connecting the boat to shore power at a marina, which of the following
checks should you perform first to ensure that the AC electrical system is safe to
energize?
A. Plug in the shore cord immediately and turn on all AC appliances at once
B. Verify that the shore pedestal voltage and frequency match the boat's AC system
ratings
,C. Start the engine and run the generator before connecting to shore power
D. Turn on the inverter and assume the shore power is compatible without checking
Mismatched voltage or frequency can damage equipment and create fire hazards.
7. While troubleshooting a DC circuit that has lost power, which of the following
sequences best describes a logical and safe method for isolating the fault without
creating additional electrical problems?
A. Replace all fuses and breakers immediately without checking for shorts or overloads
B. Check the main breaker, then individual breakers, then test for voltage at key
points
C. Bypass all breakers and wire the circuit directly to the battery to restore power
D. Turn off all loads, then randomly reconnect circuits until the problem disappears
Systematic checking isolates faults without risking further damage or fire.
8. If the engine oil pressure warning light comes on while you are motoring in calm
conditions, which of the following is the best immediate action to protect the engine
from serious damage?
A. Increase RPM to build more oil pressure and continue to your destination
B. Reduce throttle immediately, check the oil level, and shut down if pressure does
not return
C. Ignore the light and assume the sensor is faulty because the engine sounds normal
D. Add more fuel to the tank to reduce engine load and restore oil pressure
Low oil pressure can quickly destroy an engine; immediate action is critical.
9. When preparing to replace a fuel filter on a diesel engine, which of the following
procedures best ensures that you minimize air introduction into the fuel system and
avoid subsequent starting problems?
A. Remove the old filter quickly and install the new one without bleeding the system
B. Shut off the fuel supply, replace the filter, then bleed air according to the manual
C. Run the engine at high RPM while swapping filters to keep fuel flowing continuously
D. Leave the fuel supply open and allow diesel to spill freely while changing the filter
, Proper bleeding prevents airlocks that can stop the engine from starting.
10. If you notice that the bilge pump is running continuously even though there is no
obvious water in the bilge, which of the following is the most likely electrical fault
that should be investigated first?
A. The pump motor is oversized and requires a larger fuse to operate correctly
B. The float switch is stuck in the closed position or the wiring is shorted
C. The battery bank is overcharged and forcing the pump to run without need
D. The raw-water cooling system is leaking directly into the bilge pump housing
A stuck float or short will keep the pump energized continuously.
11. When inspecting the sacrificial zinc anodes on the propeller and underwater
fittings, which of the following observations would indicate that the anodes are
functioning correctly and protecting the metal?
A. The zincs are completely intact with no visible corrosion after a full season
B. The zincs show gradual, even corrosion and are partially consumed over time
C. The zincs are cracked and flaking but still attached to the underwater fittings
D. The zincs are painted over to prevent corrosion and extend their service life
Zincs should corrode sacrificially; even wear shows they are protecting other metals.
12. If the engine cooling system temperature gauge shows a steady rise while
motoring, but the raw-water strainer is clean and the seacock is fully open, which of
the following should you check next?
A. The fuel tank level and quality to ensure the engine is not over-fueling
B. The raw-water impeller condition and the exhaust elbow for blockage or restriction
C. The DC electrical system voltage to confirm the alternator is charging properly
D. The freshwater tank level and pressure to ensure the domestic system is working
Impeller wear or exhaust blockage commonly causes overheating despite clean strainers.
