Free OUPV Vessel Seamanship and Maneuvering Questions and Answers

Question 1

You are operating a single-screw vessel in a narrow channel, proceeding parallel and close to the starboard bank. Which hydrodynamic forces should you expect to affect your vessel?

Accepted Answer

The bow will be pushed away from the bank, and the stern will be pulled toward it.

Answer

This scenario describes the combined phenomena of bank cushion and bank suction. Water displaced by the bow becomes compressed against the nearby bank, creating a high-pressure cushion that pushes the bow away. Simultaneously, the accelerated flow of water into the propeller in the restricted space between the stern and the bank creates a low-pressure area, sucking the stern inward.

Question 2

When anchoring in moderate weather, what is the generally recommended minimum scope, which is the ratio of anchor rode length to the sum of water depth and the vessel's freeboard?

Accepted Answer

5:1 to 7:1

Answer

A scope of 5:1 to 7:1 is the standard recommendation for ensuring the anchor has the proper angle of pull to dig in and hold effectively in typical conditions. A shorter scope might be used for a brief stop in calm weather but is insufficient for reliable holding. A longer scope (10:1 or more) is reserved for heavy weather or poor holding ground.

Question 3

While operating in large following seas, your vessel is suddenly thrown sideways by a wave, becoming parallel to the wave crests and placing it in extreme danger of capsizing. This dangerous situation is known as:

Accepted Answer

Broaching

Answer

Broaching occurs when a vessel's speed matches the wave speed, causing a loss of steerage as it surfs down a wave face. The stern is then pushed by the wave, causing the vessel to yaw uncontrollably and end up beam-on to the seas, where it is vulnerable to being rolled over by the next wave.

Question 4

Which of the following most accurately describes the effect of 'transverse thrust' (or 'propeller walk') on a single-screw vessel with a right-handed propeller?

Accepted Answer

In reverse, it tends to push the stern to port.

Answer

A right-handed propeller (which turns clockwise in forward gear when viewed from the stern) creates a sideways force, especially at low speeds. In reverse, this force is most pronounced and consistently 'walks' the stern to port. This predictable effect is often used by skilled operators for close-quarters maneuvering.

Question 5

You are docked starboard side to a pier. A strong wind is blowing directly against your starboard beam, pinning the vessel to the dock. Which of the following is the most effective method to get underway?

Accepted Answer

Rig an after bow spring line, turn the rudder hard to starboard, and apply a short burst of forward power to pivot the stern out.

Answer

Rigging an after bow spring line (from a bow cleat to a point aft on the dock) creates a pivot point. With the rudder turned away from the dock (starboard) and a brief application of forward power, the propeller's thrust will push the stern away from the pier. Once the stern is clear, the spring line can be released and the vessel can back away.

OUPV - Operator Uninspected Passenger Vessel Practice Test

OUPV - Operator Uninspected Passenger Vessel Practice Test

Free OUPV Vessel Seamanship and Maneuvering Questions and Answers