Competence 10 (Deck)
- 1.
When going astern in a right-handed propeller ship and need to maintain the ship's heading, the rudder would be place at __________.
- A.
Rudder amidship to compensate the swing
- B.
Rudder to port to neutralize the swing
- C.
Rudder to starboard enough to compensate the swing
- D.
Hard port
Correct Answer
C. Rudder to starboard enough to compensate the swingExplanation
When going astern in a right-handed propeller ship, the propeller's rotation causes the stern to swing to the left (port side). To maintain the ship's heading, the rudder needs to be placed to starboard (right side) enough to compensate for this swing. By placing the rudder to starboard, it creates a force that counteracts the swing and helps the ship maintain its desired heading while going astern.Rate this question:
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- 2.
When steering a tow downstream around the shape of a sand bar, and staying on the proper side of the buoys, an operator should be cautions of _________.
- A.
Eddies under the bar
- B.
Cross-currents pushing the tow away from the bar
- C.
Swift current under the bar causing loss of control
- D.
Cross-currents pushing the tow into the bar
Correct Answer
A. Eddies under the barExplanation
When steering a tow downstream around the shape of a sand bar, an operator should be cautious of eddies under the bar. Eddies are circular currents that can form beneath the surface of the water, often caused by obstacles like sand bars. These eddies can create unpredictable and turbulent water conditions, which can make it difficult to steer and control the tow. Therefore, it is important for the operator to be aware of the presence of eddies and take necessary precautions to navigate around them safely.Rate this question:
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- 3.
Your vessel is off a lee shore in heavy weather and laboring. Which action should you take?
- A.
Put the bow directly into the sea and proceed at full speed
- B.
Put the sea and wind about two points on either bow and reduce speed
- C.
Heave to in the trough of the sea
- D.
Put the sea and wind o either quarter and proceed at increased speed
Correct Answer
B. Put the sea and wind about two points on either bow and reduce speedExplanation
In heavy weather and when the vessel is off a lee shore, it is important to take appropriate actions to ensure safety. Putting the sea and wind about two points on either bow and reducing speed is the correct action to take in this scenario. This maneuver helps to keep the vessel's bow facing into the waves, reducing the risk of being swamped or capsized. By reducing speed, the vessel can maintain better control and stability in challenging conditions.Rate this question:
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- 4.
You have made a turning test on full speed in deep water. You are now going to make a test in shallow water. Do you think that turning diameter will be the same?
- A.
No, the turning diameter will be smaller in shallow water.
- B.
No, the turning diameter will be increased in shallow water.
- C.
Yes, it will be the same provided the UKC is 25% -50%.
- D.
Yes, the turning diameter will be the same for all depths.
Correct Answer
B. No, the turning diameter will be increased in shallow water.Explanation
The turning diameter will be increased in shallow water because the reduced depth of the water will cause increased resistance and drag on the boat, making it harder to turn and requiring a larger turning diameter.Rate this question:
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- 5.
You want to stop your ship as quickly as possible without too much change in the heading. What can you do to achieve this?
- A.
Put the engine full astern
- B.
Make a complete turning circle
- C.
Use the rudder hard over both sides while reducing engine power, so-called "high frequency rudder cycling".
- D.
Do a zig zag maneuver
Correct Answer
C. Use the rudder hard over both sides while reducing engine power, so-called "high frequency rudder cycling".Explanation
Using the rudder hard over both sides while reducing engine power, also known as "high frequency rudder cycling," allows the ship to stop quickly while minimizing changes in the heading. By turning the rudder sharply from one side to the other, the ship creates a force that counteracts its forward momentum, slowing it down. Simultaneously reducing engine power helps to further decrease the ship's speed. This technique is effective in stopping the ship promptly without causing significant alterations in its direction.Rate this question:
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- 6.
A nylon mooring rope undergoes a decrease in strength of how many percent if it gets wet by immersion?
- A.
0.2
- B.
0.05
- C.
0.3
- D.
0.5
Correct Answer
A. 0.2Explanation
When a nylon mooring rope gets wet by immersion, it undergoes a decrease in strength of 0.2 percent.Rate this question:
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- 7.
One shackle of anchor chain is equivalent to how many fathoms?
- A.
6
- B.
60
- C.
15
- D.
90
Correct Answer
C. 15Explanation
One shackle of anchor chain is equivalent to 15 fathoms.Rate this question:
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- 8.
At the moment of impact of collision, the following should be noted:
- A.
The Nationality of the crew
- B.
Cargo damage on the other ship
- C.
The Nationality of the other vessel
- D.
The compass heading and approximate angle between the two ships
Correct Answer
D. The compass heading and approximate angle between the two shipsExplanation
The compass heading and approximate angle between the two ships should be noted at the moment of impact of collision. This information is crucial for determining the direction and angle at which the two ships collided, which can help in understanding the cause and fault of the collision. It can also assist in reconstructing the events leading up to the collision and determining the appropriate actions to be taken afterwards.Rate this question:
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- 9.
How long will a 12 knot steamer normally complete one circle turn at full rudder angle?
- A.
16 minutes
- B.
10 minutes
- C.
13 minutes
- D.
8 minutes
Correct Answer
D. 8 minutesExplanation
A 12 knot steamer refers to the speed at which the ship is traveling. When the ship is making a circle turn at full rudder angle, it means that it is making a complete 360-degree turn. The time it takes to complete this turn depends on the speed of the ship. In this case, a 12 knot steamer will take approximately 8 minutes to complete one circle turn at full rudder angle.Rate this question:
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- 10.
In the event of collision in calm weather, the colliding ship should generally remain embedded:
- A.
The colliding ship must pull out immediately
- B.
To allow another ship time to assess the damage or prepare to abandon ship
- C.
To allow crew members and passengers to transfer from the holed vessel to the colliding vessel
- D.
To allow coast guards to assess who is to blame on the collision
Correct Answer
B. To allow another ship time to assess the damage or prepare to abandon shipExplanation
In the event of a collision in calm weather, the colliding ship should generally remain embedded to allow another ship time to assess the damage or prepare to abandon ship. This is because immediately pulling out could cause further damage or endanger the crew members and passengers on both ships. By remaining embedded, the colliding ship provides a stable platform for the other ship to assess the extent of the damage and make necessary preparations for evacuation if needed.Rate this question:
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- 11.
How many turns of wire normally mark either side of the shackle 105 fathoms from the anchor?
- A.
3 turns
- B.
7 turns
- C.
6 turns
- D.
2 turns
Correct Answer
B. 7 turnsExplanation
The question is asking about the number of turns of wire that typically mark either side of the shackle 105 fathoms from the anchor. The correct answer is 7 turns. This means that the wire is wrapped around the shackle 7 times.Rate this question:
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- 12.
When steering a vessel, a good helmsman does NOT:
- A.
Use as little rudder as possible to keep the vessel on course
- B.
Consider steering a vessel a highly responsible job
- C.
Use as much rudder as possible to keep the vessel on course
- D.
Advise his relief of the course being steered
Correct Answer
C. Use as much rudder as possible to keep the vessel on courseExplanation
A good helmsman does not use as much rudder as possible to keep the vessel on course because excessive use of rudder can lead to instability and difficulty in maintaining the desired course. Using too much rudder can cause the vessel to oversteer and make it harder to control. Instead, a good helmsman aims to use as little rudder as possible to maintain the vessel on course, ensuring smooth and stable steering.Rate this question:
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- 13.
The helmsman should repeat the command given:
- A.
While the command is given
- B.
Before executing the command
- C.
While executing the command
- D.
Before the command
Correct Answer
B. Before executing the commandExplanation
The helmsman should repeat the command before executing it. This ensures that the helmsman has understood the command correctly and is ready to carry out the instructions. It also allows for any clarifications or questions to be addressed before the command is executed, reducing the chances of errors or misunderstandings during the execution of the command.Rate this question:
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- 14.
A twin screw vessel is easier to maneuver than single-screw vessel with the engines half ahead. If there is no wind or current and the rudder is amidships, which of the following will happen?
- A.
Generates more power
- B.
Can return without using her rudder
- C.
Permits the rudder to move faster
- D.
Can suck the water away from the rudder
Correct Answer
B. Can return without using her rudderExplanation
A twin screw vessel is easier to maneuver than a single-screw vessel with the engines half ahead because it has two propellers, which provide better control and maneuverability. In this scenario, if there is no wind or current and the rudder is amidships, the twin screw vessel can return without using her rudder. This is because the two propellers can be controlled independently, allowing the vessel to turn and change direction without relying on the rudder.Rate this question:
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- 15.
The anchor's holding power in tons on good anchoring ground is about:
- A.
5 - 6 times the anchor's weight
- B.
9 - 10 times the anchor's weight
- C.
7 - 8 times the anchor's weight
- D.
Dependent upon the size of the vessel
Correct Answer
C. 7 - 8 times the anchor's weightExplanation
The anchor's holding power on good anchoring ground is about 7-8 times its weight. This means that if the anchor weighs 1 ton, it can hold a vessel weighing approximately 7-8 tons. This ratio is necessary to ensure that the anchor can effectively secure the vessel in place, especially in strong winds or currents. The holding power is not dependent on the size of the vessel, but rather on the weight of the anchor itself.Rate this question:
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- 16.
The pivot point of a vessel when going ahead is located:
- A.
At the hasepipe
- B.
About one-third of the vessel's length from the bow
- C.
At the bow
- D.
About two-thirds of the vessel's length from the bow
Correct Answer
B. About one-third of the vessel's length from the bowExplanation
The pivot point of a vessel when going ahead is located about one-third of the vessel's length from the bow. This means that when the vessel is moving forward, it rotates around a point that is roughly one-third of the way from the front of the vessel. This pivot point is important to consider when maneuvering the vessel, as it affects how the vessel turns and responds to steering inputs.Rate this question:
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- 17.
When towing, a tow hook is used to:
- A.
Pull a tow alongisde
- B.
Attach a hawser to a tow which has no bitts or pad eyes
- C.
Provide quick release of the hawser
- D.
Join two hawsers for lengthening a tow
Correct Answer
C. Provide quick release of the hawserExplanation
A tow hook is used to provide a quick release of the hawser. This means that it allows for the hawser (a thick rope or cable used for towing) to be easily and rapidly detached from the towing vessel or object being towed when necessary. This quick release feature is important in emergency situations or when there is a need to quickly disconnect the tow.Rate this question:
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- 18.
A tug would NOT assist a ship to steer if the tug is made up to the large vessel in what area of vessel?
- A.
Forward on either bow of the vessel
- B.
On the vessel's quarter
- C.
Approximately amidships of the vessel
- D.
By a tow line ahead of the vessel
Correct Answer
C. Approximately amidships of the vesselExplanation
A tug would not assist a ship to steer if it is made up approximately amidships of the vessel. This is because the tug's position in this area would not provide enough leverage or control to effectively steer the ship. The tug needs to be positioned either forward on either bow of the vessel or on the vessel's quarter to have better control and maneuverability. Being made up by a tow line ahead of the vessel would also not assist with steering as it would only provide forward propulsion.Rate this question:
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- 19.
Moving vessel striking against one that is stationary is called:
- A.
Collision
- B.
Accident
- C.
Allision
- D.
Impact
Correct Answer
C. AllisionExplanation
Allision refers to a situation where a moving vessel collides with a stationary one. It specifically denotes a collision between a moving vessel and a stationary object, such as a dock, pier, or another vessel that is not in motion. This term is used to differentiate from a collision between two moving vessels or an accident involving a vessel and a fixed object. Therefore, allision is the correct answer in this case.Rate this question:
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- 20.
Prior entering an ice area, how should a vessel be trimmed?
- A.
Down by the head
- B.
Either by the head or by the stern
- C.
Down by the stern
- D.
Evenly
Correct Answer
C. Down by the sternExplanation
When entering an ice area, it is recommended to trim the vessel down by the stern. This means adjusting the distribution of weight in such a way that the stern (back) of the vessel is slightly lower than the bow (front). This helps to prevent the bow from being lifted by the ice, reducing the risk of damage to the vessel. Trimming down by the stern allows the vessel to better navigate through the ice, maintaining stability and control.Rate this question:
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- 21.
In the event of loss of rudder, what appropriate action should be done?
- A.
Use the emergency steering wheel (trick wheel)
- B.
Execute a Williamson turn
- C.
Abandon ship
- D.
A jury may be achieved by providing a drag on each side of the ship
Correct Answer
D. A jury may be achieved by providing a drag on each side of the shipExplanation
In the event of a loss of rudder, the appropriate action is to use the emergency steering wheel (trick wheel). This allows the ship to maintain some level of control and steer in the desired direction. A jury may be achieved by providing a drag on each side of the ship, but this is not the immediate action to be taken in this situation. Abandoning the ship is not necessary unless there are other critical factors involved. A Williamson turn is a specific maneuver used for search and rescue operations and is not directly related to the loss of rudder.Rate this question:
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- 22.
What does Hard Starboard mean?
- A.
Do not come to port
- B.
Put the rudder full starboard
- C.
Hard rocks on starboard
- D.
A ship is seen to starboard
Correct Answer
B. Put the rudder full starboardExplanation
"Put the rudder full starboard" means to turn the rudder completely to the right side of the ship. This is a command given to steer the ship in the direction of starboard, which is the right side of the ship when facing forward. By turning the rudder full starboard, the ship will change its course to the right.Rate this question:
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- 23.
What would you expect your rudder response to be when you enter shallow water?
- A.
Improve and your speed to decrease
- B.
Improve and your speed to increase
- C.
Be sluggish and your speed to increase
- D.
Be sluggish and your speed to decrease
Correct Answer
D. Be sluggish and your speed to decreaseExplanation
When entering shallow water, the rudder response is expected to be sluggish, meaning it will be slower and less effective in changing the direction of the boat. This is because the water is shallower, causing increased drag and reduced maneuverability. Additionally, the speed of the boat is expected to decrease in shallow water due to the increased resistance caused by the shallow depth.Rate this question:
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- 24.
The effect known as bank cushion acts in which of the following ways on a single-screw vessel proceeding along a narrow channel?
- A.
It forces the stern away from the bank
- B.
It force the entire vessel away from the bank
- C.
It force the bow away from the bank
- D.
It heels the vessel towards the bank
Correct Answer
C. It force the bow away from the bankExplanation
The effect known as bank cushion occurs when a single-screw vessel is proceeding along a narrow channel. It causes the bow of the vessel to be forced away from the bank. This happens because the water between the vessel and the bank is compressed, creating a cushioning effect that pushes the bow away. This effect helps to prevent the vessel from colliding with the bank and allows for safer navigation in narrow channels.Rate this question:
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- 25.
When your ship is going full speed ahead with no wind and no current, where do you think the pivot point is located?
- A.
At about 1/6 of the ship's length from the bow
- B.
Amidships
- C.
Near the stern
- D.
At about 1/6 of the ship's length from the stern
Correct Answer
A. At about 1/6 of the ship's length from the bowExplanation
The pivot point is located at about 1/6 of the ship's length from the bow because the ship's center of gravity is closer to the bow. This means that when the ship is moving forward, the bow will tend to pivot around this point, allowing the ship to turn more easily.Rate this question:
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- 26.
A passenger vessel must have an emergency squad when:
- A.
The size of the crew permits
- B.
Certificated for over 12 passengers
- C.
More than 50 passengers are on board
- D.
On voyage in excess of 12 hours duration
Correct Answer
A. The size of the crew permitsExplanation
The correct answer is "the size of the crew permits." This means that a passenger vessel must have an emergency squad only if the size of the crew allows for it. In other words, if the crew is large enough to accommodate an emergency squad, then it is required to have one. The presence of an emergency squad is not determined by the number of passengers on board, the duration of the voyage, or the vessel being certified for over 12 passengers.Rate this question:
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- 27.
The best line for towing small vessels is:
- A.
Three strand nylon
- B.
Manila
- C.
Double-braided nylon
- D.
Polypropylene
Correct Answer
C. Double-braided nylonExplanation
Double-braided nylon is the best line for towing small vessels. Nylon is a strong and durable material that can withstand the stress and strain of towing. The double-braided construction provides added strength and prevents the line from stretching or breaking under pressure. This makes it ideal for towing small vessels as it ensures a secure and reliable connection between the towing vessel and the towed vessel. Nylon also has good resistance to UV rays and abrasion, further enhancing its suitability for towing applications.Rate this question:
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- 28.
In towing, chocks are used to:
- A.
Protect the towline from chafing
- B.
Stop off the towline while retrieving it
- C.
Absorb shock loading on the towling
- D.
Secure the end of the towline on the tug
Correct Answer
A. Protect the towline from chafingExplanation
Chocks are used in towing to protect the towline from chafing. Chafing can occur when the towline rubs against rough surfaces or edges, causing damage and weakening the line. Chocks are typically made of a smooth and durable material, such as rubber or metal, and are placed at strategic points along the towline's path to provide a smooth surface for the line to pass over. This helps to prevent friction and abrasion, extending the lifespan of the towline and ensuring its integrity during towing operations.Rate this question:
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- 29.
The anchor's holding capability is determined primarily by which of the following?
- A.
Stowage of the anchor on board
- B.
Shape of the anchor
- C.
Size of the vessel and its draft
- D.
Anchor's ability to dig in
Correct Answer
D. Anchor's ability to dig inExplanation
The anchor's ability to dig in is the primary factor that determines its holding capability. When an anchor is dropped into the water, it needs to dig into the seabed in order to provide a secure hold. The shape of the anchor and the stowage of the anchor on board may also play a role in its holding capability, but they are secondary factors. Additionally, the size of the vessel and its draft may affect the choice of anchor size, but they do not directly determine the anchor's holding capability.Rate this question:
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- 30.
Heave is the motion of a vessel along the:
- A.
Centerline axis
- B.
Transverse axis
- C.
Longitudinal axis
- D.
Vertical axis
Correct Answer
D. Vertical axisExplanation
Heave refers to the upward and downward motion of a vessel, which occurs along the vertical axis. This motion is caused by the rise and fall of the vessel as it moves through waves or swells. The vertical axis is perpendicular to the water surface, and the heave motion is essential for understanding and predicting the vessel's behavior in rough seas.Rate this question:
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- 31.
You are standing the wheelwatch when you hear the cry, "Man overboard, starboard side". You should instinctively __________.
- A.
Give full right rudder
- B.
Put the rudder amidships
- C.
Give full left rudder
- D.
Throw a life ring to mark the spot
Correct Answer
A. Give full right rudderExplanation
When you hear the cry "Man overboard, starboard side", you should instinctively give full right rudder. This is because giving full right rudder will turn the ship towards the starboard side, which is the side where the man fell overboard. By turning the ship in this direction, you will increase the chances of reaching the person quickly and effectively during a rescue operation.Rate this question:
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- 32.
When making a Scharnow turn, the _____________.
- A.
Rudder must be put over toward the side the man went over
- B.
Initial turn direction is away from the side the man went over
- C.
Man overboard must be not more than 300 feet astern when starting the turn
- D.
Rudder is put hard over and the initial turn is maintained until about 240â—‹ from the original course
Correct Answer
D. Rudder is put hard over and the initial turn is maintained until about 240â—‹ from the original courseExplanation
When making a Scharnow turn, the rudder is put hard over and the initial turn is maintained until about 240 degrees from the original course. This means that the rudder is turned fully in one direction and the vessel continues to turn in that direction until it is approximately 240 degrees away from its original course. This maneuver is used when performing a search and rescue operation for a man overboard, as it allows the vessel to quickly change direction and return to the point where the person went overboard.Rate this question:
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- 33.
It is a particular professional knowledge regarding own ship various methods and how to change over to secondary from primary methods. It is the knowledge on ___________.
- A.
Propulsion
- B.
Steering and conning
- C.
Maneuvering
- D.
Ship handling
Correct Answer
B. Steering and conningExplanation
The given answer, "steering and conning," is the most appropriate choice because it refers to the specific knowledge related to controlling and navigating a ship. This includes understanding the different methods of steering and maneuvering the ship, as well as the ability to switch from primary to secondary methods if necessary. The other options, propulsion and ship handling, are more general and do not encompass the specific knowledge required for steering and conning a ship.Rate this question:
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- 34.
In principle of shiphandling which factor that a master or a pilot has no direct control of the ship.
- A.
Shallow water factor
- B.
Ship stops
- C.
Wind power
- D.
Reduced engine power
Correct Answer
A. Shallow water factorExplanation
The correct answer is "Shallow water factor." In shiphandling, a master or pilot has no direct control over the depth of the water. Shallow water can significantly affect the maneuverability and handling of a ship, as it can cause the ship to lose speed, reduce its maneuverability, and even run aground. Therefore, the master or pilot must take into account the shallow water factor and make appropriate adjustments to ensure the safe navigation of the ship.Rate this question:
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- 35.
When going astern in a right-handed propeller ship and need to maintain the ship's heading, the rudder would be place at ___________.
- A.
Rudder amidship to compensate the swing
- B.
Hard port
- C.
Rudder to starboard enough to compensate the swing
- D.
Rudder to port to neutralize the swing
Correct Answer
C. Rudder to starboard enough to compensate the swingExplanation
When going astern in a right-handed propeller ship, the propeller's rotation causes the ship to swing to the left. To maintain the ship's heading, the rudder needs to be placed to starboard (right) in order to counteract this swing. By positioning the rudder to starboard enough, it compensates for the swing caused by the propeller's rotation and helps the ship maintain its desired heading.Rate this question:
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- 36.
This type of screw is principally used by fast coastal craft and some classes of aircraft carriers. The propeller revolve in the same direction, so as to facilitate engine installation. This propeller is ________.
- A.
Quadruple screw
- B.
Single screw
- C.
Triple or multiple screw
- D.
Twin screw
Correct Answer
C. Triple or multiple screwExplanation
The given information states that this type of screw is used by fast coastal craft and some classes of aircraft carriers. It also mentions that the propeller revolves in the same direction to facilitate engine installation. This indicates that there are multiple propellers working together, which suggests that the correct answer is "Triple or multiple screw."Rate this question:
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- 37.
It is a propeller which is almost invariably right-handed. When the ship is driven ahead, the propeller revolves in a clockwise direction, when viewed from astern. To go astern the rotation is the propeller is reversed. It is ___________.
- A.
Single screw
- B.
Twin screw
- C.
Triple screw
- D.
Quadruple screw
Correct Answer
A. Single screwExplanation
A single screw refers to a ship that is powered by only one propeller. In this context, the explanation suggests that the propeller is right-handed, meaning it rotates in a clockwise direction when the ship is moving forward. This aligns with the concept of a single screw propulsion system, where the ship's propulsion is driven by a single propeller.Rate this question:
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- 38.
This propeller consist of the screws that are out-turning, are right-handed on the starboard side and left-handed on the port side, this type of propeller is ______________.
- A.
Twin screw
- B.
Single screw
- C.
Quadruple screw
- D.
Triple screw
Correct Answer
A. Twin screwExplanation
This type of propeller is called a twin screw because it consists of two screws that are out-turning, with right-handed screws on the starboard side and left-handed screws on the port side.Rate this question:
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- 39.
Using a sea anchor with the survival craft will __________.
- A.
Reduce your drift rate
- B.
Aid in recovering the survival craft
- C.
Keep the survival craft from turning over
- D.
Increase your visibility
Correct Answer
A. Reduce your drift rateExplanation
Using a sea anchor with the survival craft will reduce your drift rate. A sea anchor is a device that is deployed in the water to create drag and slow down the movement of the survival craft. By reducing the drift rate, the sea anchor helps to keep the survival craft in a more stable position and prevents it from being carried away too quickly by wind or currents. This can be crucial in a survival situation, as it allows for better control and increases the chances of being located and rescued.Rate this question:
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- 40.
When steering a tow downstream around the shape of a sand bar, and staying on the proper side of the buoys, an operator should be cautious of ___________.
- A.
Swift current under the bar causing loss of control
- B.
Eddies under the bar
- C.
Cross-currents pushing the tow into the bar
- D.
Cross-currents pushing the tow away from the bar
Correct Answer
B. Eddies under the barExplanation
When steering a tow downstream around the shape of a sand bar, an operator should be cautious of eddies under the bar. Eddies are circular currents that can form beneath the surface of the water. These eddies can be unpredictable and can cause turbulence, which may result in loss of control of the tow. Therefore, it is important for the operator to be aware of the presence of eddies and take necessary precautions to navigate safely around the sand bar.Rate this question:
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- 41.
A ship is having a slow speed, by using the backing maneuver, the ship is considered to be dead on the water when the
- A.
Quick water reaches the stern
- B.
Speed of the ship is the same speed as quick water
- C.
Quick water reaches the amidships
- D.
Quick water reaches about 1/4 distance from the stern
Correct Answer
C. Quick water reaches the amidshipsExplanation
When the quick water reaches the amidships, it means that the ship has come to a complete stop. This is because amidships is the middle part of the ship, so if the quick water has reached this point, it indicates that the ship is no longer moving forward. Therefore, when the quick water reaches the amidships, the ship is considered to be dead on the water.Rate this question:
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- 42.
A ship is not turning around the center of gravity, but another point. What is the point called?
- A.
Point of turning
- B.
Point of radius
- C.
Pivot point
- D.
Point of no return
Correct Answer
C. Pivot pointExplanation
The correct answer is "pivot point." A ship does not turn around its center of gravity, but rather around a specific point known as the pivot point. This point is crucial in determining the ship's turning radius and maneuverability. It is the point where the ship rotates or pivots when changing direction.Rate this question:
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- 43.
A ship is turning around a point called the "pivot point". What is the position of this invisible point when the ship is "dead" in the water?
- A.
Outside of the center line
- B.
About same position as the center of gravity
- C.
Near the stern of the ship
- D.
Near the bow
Correct Answer
B. About same position as the center of gravityExplanation
When a ship is "dead" in the water, it means that it is not moving forward or backward. In this state, the pivot point, which is the point around which the ship turns, will be in the same position as the center of gravity. This is because when the ship is not moving, the forces acting on it are balanced, and the pivot point will be located at the center of gravity to ensure stability.Rate this question:
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- 44.
A single-screw vessel going ahead tends to turn more rapidly to port because of propeller _________.
- A.
Suction current
- B.
Thrust
- C.
Sidewise force
- D.
Discharge current
Correct Answer
C. Sidewise forceExplanation
A single-screw vessel going ahead tends to turn more rapidly to port because of propeller sidewise force. When the propeller rotates, it creates a sideways force known as the sidewise force. This force pushes the water to one side, resulting in a greater force on the port side of the vessel. As a result, the vessel turns more rapidly to port. The sidewise force is responsible for the turning effect and the tendency of the vessel to deviate from its straight path.Rate this question:
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- 45.
Your vessel is off a lee shore in heavy weather and laboring. Which action should you take?
- A.
Put the bow directly into the sea and proceed at full speed.
- B.
Put the sea and wind about two points on either bow and reduce speed.
- C.
Heave to in the trough of the sea.
- D.
Put the sea and wing on either quarter and proceed at increased speed.
Correct Answer
B. Put the sea and wind about two points on either bow and reduce speed.Explanation
In heavy weather and when a vessel is off a lee shore, it is important to take appropriate action to ensure the safety of the vessel and its crew. Putting the sea and wind about two points on either bow means turning the bow slightly away from the wind and sea, which helps to reduce the impact of the waves and wind on the vessel. Reducing speed is also necessary to maintain control and stability. This action allows the vessel to maintain a safer position and reduces the risk of being driven onto the shore.Rate this question:
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- 46.
Your vessel is backing on the starboard screw, and going ahead on the port screw. The bow will _________.
- A.
Swing to starboard
- B.
Swing to port
- C.
Move ahead on a straight line
- D.
Back on a straight line
Correct Answer
A. Swing to starboardExplanation
When a vessel is backing on the starboard screw and going ahead on the port screw, the unequal thrust generated by the two screws will cause the bow of the vessel to swing towards the side with less thrust, which in this case is the starboard side. Therefore, the correct answer is "swing to starboard".Rate this question:
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- 47.
Your ship is going full astern and making sternway. Where will the "pivot point" be located? No wind, current.
- A.
Somewhere aft of the center of gravity, but is is impossible to pin-point the exact location
- B.
At the center of gravity
- C.
At 1/6 of the ship's length off the bow
- D.
At 1/6 of the ship's length from the stern
Correct Answer
A. Somewhere aft of the center of gravity, but is is impossible to pin-point the exact locationExplanation
When a ship is going full astern and making sternway, the pivot point is located somewhere aft of the center of gravity. However, it is impossible to pinpoint the exact location of the pivot point because it depends on various factors such as the ship's design, size, and the specific maneuver being executed. The pivot point is the point around which the ship rotates or turns, and its location can shift depending on the circumstances.Rate this question:
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- 48.
Your ship is going full ahead as you start to slow down. Where is the position of the "pivot point" now? No wind, current.
- A.
Same position as when the ship is on full ahead
- B.
It will move aft as the ship slow down
- C.
It will move to the side of the center line
- D.
The "pivot point" will move to the stern
Correct Answer
B. It will move aft as the ship slow downExplanation
As the ship slows down, the pivot point will move aft. The pivot point is the point around which the ship rotates or turns. When the ship is moving full ahead, the pivot point is located towards the bow or front of the ship. However, as the ship slows down, the forces acting on the ship cause it to rotate around the pivot point, resulting in the pivot point moving towards the stern or back of the ship. This is because the momentum of the ship causes it to continue moving forward even as it slows down, causing the pivot point to shift towards the back.Rate this question:
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- 49.
Your ship is drifting in open sea with temporary engine malfunction. You are equipped with precise navigation equipment. What should you do in this situation?
- A.
Ask the chief engineer when the engine will be ready
- B.
Go to bed and wait for the engine to be easy
- C.
Call the company immediately
- D.
Use the opportunity to plot direction and rate of drift for later use
Correct Answer
D. Use the opportunity to plot direction and rate of drift for later useExplanation
In this situation, it is important to take advantage of the precise navigation equipment to plot the direction and rate of drift. This will provide valuable information for later use, such as calculating the distance traveled and estimating the time it will take for the engine to be repaired. It is not advisable to wait for the engine to be fixed without taking any action or to call the company immediately without assessing the situation. Asking the chief engineer about the engine's readiness is also not the most appropriate course of action at this point.Rate this question:
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- 50.
Your ship is dead in the water with the rudder amidships. As the right-handed screw starts to turn ahead, the bow will tend to go __________.
- A.
To port
- B.
As influenced by the tide and sea
- C.
To starboard
- D.
Straight ahead
Correct Answer
A. To portExplanation
When the right-handed screw starts to turn ahead, the propeller will push water towards the stern of the ship. According to Newton's third law of motion, the reaction to this action will cause the ship to move in the opposite direction, which is to port (left). This is because the force of the water being pushed towards the stern will create a force pushing the bow to the left.Rate this question:
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Current Version
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Sep 01, 2023Quiz Edited by
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Jun 17, 2015Quiz Created by
Catherine Halcomb