Hotel Service Unit 16 Stabilizer Flashcards

What is the main purpose of an active tank stabilization system on a vessel?

B) To reduce vessel roll and improve stability in rough seas

How does an Active Controlled Tank system maintain stability during varying sea conditions?

B) Through continuous adjustments made by the automated control system in response to sensor data

What role does the gyroscope play in the operation of active fin stabilizers?

B) It senses vessel roll and signals the control system to adjust fin angles

What is a disadvantage of active fin stabilizers?

B) They increase fuel consumption due to added drag

Where are the tanks typically located in an active tank stabilization system?

C) Amidships on either side of the vessel

How do bilge keels compare to other stabilization methods in terms of maintenance needs?

B) They are generally maintenance-free

How does the water movement in an ACT system counteract vessel roll?

B) By creating a counterweight that resists the roll motion

Why is an active tank stabilization system effective even when the vessel is stationary?

C) It can actively adjust water movement in the tanks to counteract any rolling motion

Which degree of freedom describes the vessel's rotational motion about its longitudinal axis?

C) Roll

When are active fin stabilizers most effective?

A) At high vessel speeds

Which of the following is an advantage of using an active tank stabilization system over passive systems like bilge keels?

A) It operates effectively at all speeds, including when the vessel is stationary

Which other type of tank stabilizer system, aside from free surface tanks, is commonly used to reduce vessel roll?

C) U-tube anti-roll tanks

What is one drawback of an active tank stabilization system?

A) It increases fuel consumption due to the pumps required for operation

What is the primary function of the control system in an Active Controlled Tank roll damping system?

B) To automatically adjust water flow based on real-time roll data

What is the purpose of the pumps and valves in an active tank stabilization system?

B) To circulate water within the tanks to create a counteracting force against roll

What is a primary disadvantage of a stabilizing tank system compared to fin stabilizers?

B) It reduces the vessel’s fuel efficiency

What is one primary advantage of bilge keels compared to active stabilization methods?

A) They require no power to operate

How does the control system in an active tank stabilization system work?

B) It automatically adjusts water flow based on real-time sensor data on vessel roll

What is the primary function of active fin stabilizers on a vessel?

B) To reduce vessel roll by generating lift forces

Which factor is a consideration when choosing bilge keels over fin stabilizers for a vessel?

B) Cost and maintenance requirements

How are bilge keels typically attached to a vessel’s hull?

B) By welding along their entire length to the hull

Which of the following is a disadvantage of bilge keels?

C) They are less effective at stabilizing than fin stabilizers

What is a primary advantage of using active fin stabilizers over passive systems like bilge keels?

B) They actively counter roll at higher speeds, providing dynamic stabilization

Why is an Active Controlled Tank system preferred in certain vessels over traditional bilge keels?

A) It is effective at all speeds, including low and stationary conditions

What is the main reason for positioning bilge keels along the longitudinal length of the hull?

C) To provide maximum resistance to rolling motions across the beam

How do active fin stabilizers respond to sudden increases in wave height?

B) By adjusting fin angles to generate more lift

How does an active tank stabilization system improve crew and passenger comfort?

B) By minimizing vessel roll, resulting in a smoother experience during rough sea conditions

Which of the following is a disadvantage of fin stabilizers compared to stabilizing tank systems?

C) They are less effective at low speeds and increase drag at high speeds

Why are bilge keels usually located at the bilge of the vessel?

C) To enhance stability by increasing resistance to roll at the vessel's widest point

Where are Active Controlled Tanks typically located on a vessel?

B) Amidships, on both port and starboard sides

What effect does the angle of attack have on fin stabilizers?

A) It controls the lift generated by the fins to counteract rolling

Which type of sensor is commonly used in an active tank stabilization system to detect vessel roll?

C) Gyroscope or inclinometer

What is the term for the rotational movement around a vessel's vertical axis?

C) Yaw

Where are bilge keels typically located on a vessel?

C) Along the bilge, at the turn of the hull

What is the "sway" motion of a vessel?

B) The sideways movement to port and starboard

How do active fin stabilizers generate lift to counteract roll?

A) By adjusting the angle of the fins relative to water flow

What additional component is essential in an ACT system to detect vessel roll?

B) Gyroscope or accelerometer

What is a potential disadvantage of an Active Controlled Tank system?

B) It increases fuel consumption due to the weight of water and operational pumps

What is the primary component used in an Active Controlled Tank roll damping system to counteract vessel roll?

B) Water ballast tanks with controlled water flow

Why are bilge keels less effective in controlling pitch compared to roll?

B) Pitch involves movement along the longitudinal axis, not the transverse

How are the water flows in an Active Controlled Tank system managed?

B) Through an automated control system with pumps and valves

Which of the following best describes the degree of freedom known as "heave"?

A) The vertical up and down movement of the vessel

Which of the following is a common type of tank anti-roll stabilizer system?

C) Free surface anti-roll tanks

What is "pitch" in the context of vessel motion?

D) Rotation about the transverse axis

How do bilge keels help reduce vessel motion?

B) By increasing resistance to roll through hydrodynamic drag

Which degree of freedom involves the vessel's forward and backward movement?

C) Surge

Why might a vessel choose fin stabilizers over a stabilizing tank system?

C) Fin stabilizers are generally more efficient at higher speeds

What advantage does a stabilizing tank system have in terms of maintenance compared to fin stabilizers?

B) Stabilizing tanks generally require less maintenance as they are passive systems

What type of control system is typically used to adjust fin angle in response to roll?

B) Automatic control system with gyroscope sensors

Which of the following is an advantage of a stabilizing tank system compared to fin stabilizers?

A) It is effective at all vessel speeds, including low and stationary speeds
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