Engine Basics Flashcards
7 cards from real ALABAMA BOATERS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Engine Basics flashcards as text
What is the recommended action if your outboard engine's water tell-tale stops flowing while underway?
Answer: Reduce speed and shut off engine to investigate possible water pump failure
Loss of the tell-tale stream indicates the water pump may have failed; continuing to run the engine risks severe overheating and permanent damage.
How does a kill switch (engine cut-off switch) enhance boater safety?
Answer: It automatically stops the engine if the operator is ejected from the helm position
The kill switch lanyard, attached to the operator, cuts the engine immediately if the operator falls overboard, preventing the unmanned boat from circling and striking them.
What is the significance of an engine's 'compression ratio'?
Answer: It indicates the ratio of cylinder volume between bottom and top of piston stroke, affecting power and efficiency
Compression ratio is the ratio of the cylinder's maximum volume to its minimum volume; higher ratios generally produce more power and efficiency but require higher-octane fuel.
Which maintenance step helps prevent corrosion on an outboard motor's electrical connectors?
Answer: Applying dielectric grease to connectors
Dielectric grease is a non-conductive compound that seals out moisture and oxygen from electrical connectors, preventing corrosion without interfering with electrical contact.
What happens to engine performance when a fuel filter becomes clogged?
Answer: Fuel flow is restricted, causing power loss, rough running, or stalling
A clogged fuel filter restricts fuel flow to the engine, resulting in fuel starvation that causes hesitation, power loss, or complete engine stall.
In marine engines, what is the primary role of the alternator or stator?
Answer: Charge the battery and power electrical accessories while the engine runs
The alternator (or stator on smaller outboards) generates electricity when the engine runs, replenishing the battery and supplying power to lights and electronics.
What precaution should be taken when storing a boat with a gasoline engine for more than 30 days?
Answer: Add a fuel stabilizer to the tank and run the engine briefly to distribute it
Fuel stabilizer prevents gasoline from oxidizing, forming varnish deposits, or absorbing moisture during storage, protecting the fuel system and carburetor or injectors.