PCOC Vehicle Systems and Operations 2 — Questions and Answers
Question 1: What does a boat's trim refer to?
- The angle of the vessel bow-to-stern relative to the waterline (Correct answer)
- The speed at which the engine idles
- The distance between the hull and the keel
- The rate at which the bilge pump removes water
Correct answer: The angle of the vessel bow-to-stern relative to the waterline
Trim describes the fore-and-aft angle of the boat as it sits in or moves through the water.
Question 2: Which of the following best describes a planing hull?
- A hull that rises and skims on top of the water at higher speeds (Correct answer)
- A hull that always displaces its own weight in water
- A hull designed exclusively for sailing vessels
- A flat-bottomed hull that sinks when loaded
Correct answer: A hull that rises and skims on top of the water at higher speeds
A planing hull is designed to rise up and skim across the water surface once sufficient speed is reached.
Question 3: What is the primary purpose of a boat's keel?
- To provide lateral stability and prevent sideways drift (Correct answer)
- To increase engine horsepower output
- To reduce the vessel's overall weight
- To improve the bilge pump's efficiency
Correct answer: To provide lateral stability and prevent sideways drift
The keel runs along the bottom centerline of the hull and helps keep the boat tracking straight and stable.
Question 4: On an outboard motor, the water pump impeller is responsible for:
- Circulating cooling water through the engine (Correct answer)
- Pumping fuel from the tank to the carburetor
- Regulating oil pressure in the lower unit
- Controlling the throttle response
Correct answer: Circulating cooling water through the engine
The impeller draws water from below the waterline and circulates it through the engine to prevent overheating.
Question 5: What does the term 'dead in the water' mean when applied to a vessel?
- The boat has no propulsive power and is not moving (Correct answer)
- The engine is idling but the boat is anchored
- The vessel is traveling at minimum steerage speed
- The boat is moored at a dock with engine off
Correct answer: The boat has no propulsive power and is not moving
A vessel dead in the water has lost all way and cannot be steered or propelled under its own power.
Question 6: Which fuel system component prevents fuel vapors from accumulating in the bilge?
- The engine compartment blower or ventilation system (Correct answer)
- The carburetor float bowl
- The fuel primer bulb
- The fuel tank vent cap
Correct answer: The engine compartment blower or ventilation system
A blower or natural ventilation system removes flammable fuel vapors from enclosed engine compartments before starting.
Question 7: A boat's displacement refers to:
- The weight of water pushed aside by the hull, equal to the vessel's weight (Correct answer)
- The distance the boat travels between shifts of the gearbox
- The volume of the fuel tanks in liters
- The speed loss when traveling against a current
Correct answer: The weight of water pushed aside by the hull, equal to the vessel's weight
Displacement is the weight (or volume) of water that the hull moves aside, which equals the total weight of the floating vessel.
PCOC Vehicle Systems and Operations 2
What does a boat's trim refer to?