Boating Certification Test Vessel Operation & Control 3 — Questions and Answers
Question 1: What is 'cavitation' on a boat propeller?
- The propeller spinning in reverse
- The formation and collapse of vapor bubbles on the propeller blades causing loss of thrust (Correct answer)
- Excessive engine vibration at low RPM
- Water entering the engine cooling system
Correct answer: The formation and collapse of vapor bubbles on the propeller blades causing loss of thrust
Cavitation occurs when low pressure causes water to vaporize on the propeller surface; the collapsing bubbles reduce thrust and can damage the prop.
Question 2: When operating in fog, what sound signal should a power-driven vessel underway make?
- One prolonged blast every 2 minutes (Correct answer)
- Two short blasts every 2 minutes
- One prolonged and two short blasts every 2 minutes
- Three short blasts every minute
Correct answer: One prolonged blast every 2 minutes
Rule 35 requires a power-driven vessel making way through the water to sound one prolonged blast at intervals of not more than 2 minutes in restricted visibility.
Question 3: What does 'freeboard' mean on a vessel?
- Extra storage space below deck
- The distance from the waterline to the top of the gunwale (deck edge) (Correct answer)
- The maximum number of passengers allowed
- The tension in the anchor line
Correct answer: The distance from the waterline to the top of the gunwale (deck edge)
Freeboard is the height of the hull above the waterline, which indicates how much reserve buoyancy remains before water can enter the vessel.
Question 4: You are traveling at planing speed and need to stop quickly. What is the most effective method?
- Shift directly to full reverse immediately
- Gradually reduce throttle to idle, then shift to reverse (Correct answer)
- Turn the wheel hard to one side to bleed speed
- Drop anchor immediately
Correct answer: Gradually reduce throttle to idle, then shift to reverse
Reducing throttle first to idle before shifting to reverse prevents engine and drive damage, and allows the hull to settle off plane before reverse thrust is applied.
Question 5: What is the effect of 'torque' from a single right-handed propeller on a vessel at low speed?
- The bow is pushed to starboard
- The stern tends to walk to port when in forward gear (Correct answer)
- The vessel accelerates straight forward
- The stern is pushed to starboard in reverse
Correct answer: The stern tends to walk to port when in forward gear
A right-handed prop rotating clockwise in forward gear creates prop walk that tends to push the stern to port, affecting low-speed maneuvering.
Question 6: What is the maximum number of people a vessel can legally carry?
- As many as can fit comfortably on deck
- The number listed on the capacity plate installed by the manufacturer (Correct answer)
- Five adults per 10 feet of boat length
- Unlimited, at the operator's discretion
Correct answer: The number listed on the capacity plate installed by the manufacturer
The USCG capacity plate specifies the maximum persons, weight, and horsepower the vessel is rated for — exceeding it is illegal and dangerous.
Question 7: Which statement about operating a vessel in reverse is correct?
- Steering response in reverse is the same as going forward
- In reverse, the stern (rear) of the vessel leads and steering is more difficult (Correct answer)
- Propellers provide no thrust in reverse on most outboard engines
- Speed limits do not apply when operating in reverse
Correct answer: In reverse, the stern (rear) of the vessel leads and steering is more difficult
When reversing, the stern leads the bow, and water flow over the rudder or outdrive is reduced, making precise steering more challenging.
Boating Certification Test Vessel Operation & Control 3
What is 'cavitation' on a boat propeller?