Aux 1 Unit 9 Steering Gears – two ram, hydraulic Flashcards

Aux 1 Unit 9 Steering Gears – two ram, hydraulic

Why is it important for the rams to be synchronized in a two-ram steering gear system?

B) To ensure that the tiller is moved evenly and the rudder is steered accurately

What is the purpose of the rudder movement requirement in SOLAS II-I, Regulation 29?

B) To ensure that the vessel can be maneuvered effectively and safely in all conditions

How is hydraulic fluid pressure generated in a hydraulic telemotor system?

C) By the movement of the helm, which is mechanically linked to the transmitter unit

According to SOLAS II-I, Regulation 29, what is the minimum rudder angle that must be achieved from port to starboard (or vice versa) within 28 seconds for vessels of 10,000 gross tons and above?

A) 25 degrees to port and 25 degrees to starboard

Why is it important for the hunting gear to prevent overcorrection in a hydraulic steering system?

A) To ensure the vessel maintains a stable course without continuous oscillations or corrections

How does 100% redundancy contribute to the reliability of a steering gear system?

B) By ensuring that there is no single point of failure that can disable the entire steering system

What should be checked to ensure that the steering gear can operate in both normal and emergency modes?

B) The emergency steering controls and backup power supply for functionality

How does an autopilot system interact with a valve-operated steering gear system to control the vessel's heading?

B) The autopilot sends electrical signals to the servo valves in the steering gear, which control the hydraulic fluid flow to move the rudder.

How does a non-return valve prevent the idle pump from motoring in a hydraulic system?

B) By blocking reverse fluid flow, ensuring that the idle pump does not receive backflow pressure that could cause it to spin

In a rotary vane steering gear system, how does hydraulic fluid move the rudder to the desired position?

B) By applying pressure to the vanes within the rotary vane unit, causing the rudder to rotate to the desired angle

Which routine maintenance check is crucial for the proper functioning of the steering gear?

A) Lubricating all moving parts, such as rudder stocks and linkages, to reduce friction and wear

How does the hydraulic telemotor system transmit steering commands from the helm to the steering gear?

C) By varying the hydraulic pressure in the control lines connected to the steering gear

What is the minimum required rudder angle to which the steering gear must be capable of moving the rudder on both sides, according to SOLAS II-I, Regulation 29?

B) 25 degrees

What could happen if the pressure relief valve fails to function properly in a hydraulic steering system?

B) Excessive pressure could cause the idle pump to motor, leading to potential damage and inefficiency.

Why is it important to verify the operation of steering alarms before departure?

B) To ensure that any failures or malfunctions in the steering system are immediately detected and signaled to the bridge

Which of the following best describes a system that meets the single failure criteria?

B) The system is capable of operating normally even if one critical component fails.

Which of the following checks ensures that the steering gear can be controlled from multiple locations?

B) Testing the steering gear from both the bridge and the emergency steering position

What is a primary design consideration for a hydraulic system used in a two-ram steering gear?

B) The ability to maintain steerage even in the event of hydraulic pipe failure

What is the primary purpose of having an emergency electric control system in place for the steering gear?

B) To ensure that steering can still be controlled if the telemotor system fails, maintaining the safety and navigability of the vessel

What is the role of the control system in managing rudder movement in an electro-hydraulic, ram-type steering gear?

B) To automatically adjust the rudder angle and stop it at the maximum allowable movement

How does the hunting gear provide feedback to the steering mechanism?

B) By sensing the rudder's position and adjusting the hydraulic valves to reduce or stop fluid flow as the rudder approaches the desired angle

In a valve-operated, rotary vane steering gear, what prevents the rudder from moving too far beyond the desired angle?

B) Mechanical stops within the rotary vane unit and pressure relief valves in the hydraulic system

Which check is necessary to ensure there are no hydraulic fluid leaks in the steering gear system?

B) Inspecting all hydraulic lines, fittings, and connections for any signs of leaks or damage

What is a potential consequence of not using a non-return valve in a hydraulic steering system?

B) The idle pump may start motoring, leading to wear and potential damage to the pump

What could be a potential consequence if the hydraulic fluid in a telemotor system becomes contaminated?

B) The system could experience reduced efficiency, leading to sluggish or inaccurate steering responses.

How does the use of two independent hydraulic pumps contribute to the reliability of a two-ram steering gear system?

B) It ensures that one pump can take over if the other fails, maintaining hydraulic pressure and steerage.

In an electro-hydraulic, ram-type steering gear, how is it ensured that the rudder does not exceed the maximum allowable movement?

A) By using limit switches that cut off hydraulic pressure when the rudder reaches the set maximum angle

What happens when the helm is turned to starboard in a hydraulic telemotor system?

B) The pressure in the starboard control line increases, causing the rudder to move to starboard.

What is the primary safety benefit of designing a steering gear system to meet single failure criteria?

B) It ensures that the vessel can continue to be safely navigated even if a component of the steering gear fails.

What is the role of the hydraulic power unit (HPU) in the operation of a two-ram steering gear?

B) It controls the direction and speed of the rams by supplying pressurized hydraulic fluid

If the telemotor system fails in an electro-hydraulic steering gear, what is one method by which steering can be maintained?

B) By using an emergency electric control system that bypasses the telemotor and directly controls the hydraulic pumps

What advantage does an accumulator provide in the hydraulic system of a two-ram steering gear?

B) It stores hydraulic energy to be used in case of a pump failure, ensuring temporary steerage.

What is the purpose of the balance pipe in a hydraulic telemotor system?

B) To equalize the hydraulic pressure between the port and starboard control lines, ensuring smooth operation

For vessels of less than 10,000 gross tons, how quickly must the rudder be capable of moving from 35 degrees on one side to 30 degrees on the other side, according to SOLAS II-I, Regulation 29?

C) Within 28 seconds

What is the role of a non-return valve in the hydraulic system of a two-ram steering gear?

B) To prevent backflow of hydraulic fluid, ensuring that pressure is maintained in the active circuit

Why is the single failure criteria important in the design of steering gear systems?

B) To ensure that the vessel can still be steered even if a critical component fails, enhancing the safety and reliability of the vessel

What could happen if spherical bearings were not used in the ram ends of a steering gear system?

B) The system could experience increased wear, misalignment, and potential failure due to the inability to accommodate angular movement.

In what way do spherical bearings improve the safety of a two-ram steering gear system?

B) By ensuring that the rams can move freely without causing misalignment or stress on the tiller, reducing the risk of mechanical failure

Why is it important to check the rudder angle indicator before leaving port?

B) To verify that the rudder angle indicator correctly reflects the actual position of the rudder

Which of the following components might be duplicated in a steering gear system to achieve 100% redundancy?

B) Hydraulic pumps, control valves, and power units

What is the primary function of an autopilot system in an automatic steering system?

B) To automatically maintain a vessel on a set course with minimal human intervention

Where is the pressure relief valve typically located in a hydraulic steering system to prevent motoring of the idle pump?

C) In the discharge line or near the hydraulic actuator

What role do servo valves play in a valve-operated steering gear system?

B) They control the flow of hydraulic fluid to the steering gear rams based on signals from the autopilot

What should be the crew’s priority if the primary hydraulic system fails and the vessel relies on emergency steering gear?

B) To reduce the vessel's speed and notify the bridge to prepare for manual steering

In a 100% redundant steering gear system, what would happen if one hydraulic pump fails?

B) The redundant pump would automatically engage, and steering would continue normally.

What role does the rotary vane unit play in the steering gear system?

B) It converts the hydraulic pressure from the directional valve into rotary motion to move the rudder

What is the first step to be taken when performing steering gear checks before a vessel leaves port?

B) Verify that the steering gear system is properly powered and that the hydraulic pumps are operational

How do spherical bearings contribute to the longevity of a two-ram steering gear system?

B) By reducing friction and wear at the connection points between the rams and the tiller

If the rudder movement exceeds the maximum allowable angle, how is the steering gear system protected from damage?

B) By using mechanical stops to physically prevent the rudder from moving beyond a certain point

What is the result of the hunting gear's action when the rudder reaches the set angle?

B) The hydraulic flow is reduced or stopped, ensuring the rudder remains at the set angle.

What role does the hunting gear play in the overall stability of the vessel's course?

B) It ensures that course changes are smooth and controlled, avoiding erratic movements or oscillations.

Where is the non-return valve typically installed to prevent the idle pump from motoring?

B) In the discharge line of the pump

What happens when the autopilot system detects that the vessel is deviating from its set course?

B) The autopilot system adjusts the rudder position to correct the course.

What happens to the hydraulic fluid after it has been used to move the rotary vane unit in the steering gear system?

B) It is cooled and then recirculated back to the hydraulic reservoir

What is the role of the transmitter unit in a hydraulic telemotor system?

B) To convert the mechanical movement of the helm into hydraulic pressure changes

Why is it important for the vessel’s crew to be trained in using the emergency steering gear?

B) To ensure they can effectively steer the vessel if the hydraulic system fails, maintaining control and safety

What ensures that the steering gear responds accurately to the commands from the autopilot system?

B) A feedback loop from the rudder position sensor provides real-time data to the autopilot.

Which component in the hydraulic telemotor system responds to the pressure changes transmitted by the helm?

B) The receiver unit

Why is 100% redundancy important in steering gear systems on vessels?

B) To ensure that the vessel can still be safely navigated even if a critical component of the steering gear fails

What role does the feedback mechanism play in a hydraulic telemotor system?

B) To provide real-time information to the helm about the rudder's position, allowing for accurate adjustments

What is the primary purpose of the hunting gear in a hydraulic steering system?

C) To prevent overcorrection by providing feedback to the steering mechanism, ensuring the rudder stops at the desired angle

How can the ship's crew ensure that the steering gear remains operational if the telemotor system fails during navigation?

B) By engaging the manual steering control, which bypasses the telemotor

How does meeting the single failure criteria affect the design of a steering gear system?

A) It requires the inclusion of redundant or backup components that can take over if a primary component fails.

What is the primary function of a non-return (check) valve in a hydraulic steering gear system?

B) To prevent fluid from flowing back into the idle pump, thereby preventing it from motoring

What is the primary function of a hydraulic telemotor system in a ship's steering gear?

B) To transmit the steering command from the bridge to the steering gear via hydraulic pressure

How does the use of feedback from a rudder position sensor enhance the operation of a two-ram steering gear system?

B) It provides real-time data to adjust the hydraulic flow, ensuring accurate rudder positioning.

Why is it important to set the pressure relief valve at the correct pressure in a hydraulic steering system?

B) To protect the hydraulic components from excessive pressure and to prevent the idle pump from being driven by high pressure

Why is it critical to have both mechanical stops and pressure relief valves in the steering gear system?

B) To ensure that both mechanical and hydraulic components are protected from excessive forces, preventing damage and ensuring reliable operation

What is the primary function of the directional control valve in a valve-operated, rotary vane steering gear system?

B) To direct the flow of hydraulic fluid to the appropriate side of the rotary vane unit, depending on the desired rudder angle

What fitting is necessary to secure the connection between the ram ends and the tiller in a two-ram steering gear system?

C) Pin joints with spherical bearings

How does the autopilot system correct course deviations in an automatic steering system?

B) By sending signals to the steering gear to move the rudder in the appropriate direction

How is the rudder movement requirement tested and verified on a vessel?

B) By conducting steering drills during sea trials and routine inspections

What does "100% redundancy" in a steering gear system refer to?

B) The system includes duplicate components that can fully take over if the primary components fail, ensuring continuous operation.

What is the purpose of having a secondary, independent hydraulic system in place for steering gears?

B) To provide a backup means of steering in case the primary hydraulic system fails

Why is it important to prevent the idle pump from motoring in a hydraulic steering gear system?

B) To prevent unnecessary wear and potential damage to the pump and to avoid energy wastage

How does a pressure relief valve prevent the idle pump from motoring when the system pressure increases?

B) By diverting excess fluid back to the reservoir, reducing pressure in the line that could otherwise cause the pump to motor

How does the hunting gear prevent continuous rudder movement after the desired angle is reached?

B) By providing feedback that stops or reverses the flow of hydraulic fluid, preventing further movement

What is the purpose of verifying the steering gear’s hydraulic pressure before departure?

B) To ensure that the hydraulic pressure is within the specified range, allowing the steering gear to operate efficiently

What could happen if the hunting gear in a hydraulic steering system is not functioning correctly?

B) The rudder might overshoot the desired angle, leading to continuous adjustments and unstable steering.

Why is it important to have manual override capabilities in an automatic steering system?

B) To allow the crew to manually control the steering in case of autopilot malfunction or in situations requiring human judgment

In a typical two-ram steering gear arrangement, where are the rams positioned relative to the tiller?

A) Parallel to each other and connected on opposite sides of the tiller

What maintenance practice is essential to ensure the reliable operation of a hydraulic telemotor system?

A) Regularly checking and maintaining the hydraulic fluid levels and quality

Why are spherical bearings used at the ends of the rams in a two-ram steering gear system?

B) To accommodate angular misalignment and pivoting motion as the rams move

Which component in a hydraulic steering gear system works closely with the hunting gear to ensure accurate rudder positioning?

B) The servo valve or hydraulic control valve

Before leaving port, why should the crew review the steering gear maintenance logs?

B) To ensure that all scheduled maintenance has been performed and there are no outstanding issues with the steering gear

What role does a pressure relief valve play in preventing the idle pump from motoring in a hydraulic steering system?

B) It releases excess pressure from the system, preventing it from driving the idle pump.

Which component of an automatic steering system detects deviations from the set course?

B) The gyrocompass or heading sensor

What should be done to verify the responsiveness of the steering gear?

B) Operate the steering gear through its full range of motion to ensure it responds correctly to helm inputs

In an automatic steering system, what is the function of the feedback mechanism?

B) To provide real-time information to the autopilot about the current rudder angle

Which component is typically used to allow the rams to pivot while exerting force on the tiller in a two-ram steering gear?

B) Spherical bearings

How can a hydraulic system for a two-ram steering gear ensure that steerage is maintained during a hydraulic pipe failure?

B) By incorporating a dual, independent hydraulic circuit system, each capable of operating the steering gear independently

If the vessel does not have a secondary hydraulic system and the primary system fails, what alternative method could be used to achieve steering?

A) Using emergency steering gear, such as a manual steering mechanism or emergency tiller

In a dual-circuit hydraulic system for a two-ram steering gear, what is the purpose of a cross-connection valve?

B) To allow fluid to flow between the two circuits in case of a failure in one circuit

Why is it important for the hydraulic fluid in a rotary vane steering gear system to be kept at the proper pressure?

A) To ensure the rudder moves smoothly and with the necessary force to achieve the desired steering angle

In addition to the emergency electric control system, what other method can be used to maintain steering if the telemotor fails?

A) Using a mechanical linkage directly connected to the rudder

What component is crucial in a two-ram steering gear hydraulic system to isolate a failed section of the hydraulic circuit?

B) An isolation valve

What is a key benefit of using a variable displacement pump in the hydraulic system of a two-ram steering gear?

B) It allows for efficient control of hydraulic flow and pressure, optimizing steering response and energy consumption.

What does the term "single failure criteria" mean in the context of a steering gear system?

B) The system is designed to maintain operational capability even if any single component fails.

What additional feature may be incorporated in the steering gear system to protect it from damage if the maximum rudder angle is exceeded?

B) A pressure relief valve that releases excess hydraulic pressure to prevent system overload

How does the feedback mechanism work in conjunction with the directional control valve in a rotary vane steering gear system?

B) It sends signals to the directional control valve to stop or reverse fluid flow when the rudder reaches the desired angle.

What should be regularly tested to ensure the reliability of a dual-circuit hydraulic system in a two-ram steering gear?

B) The emergency steering mode and the functionality of all isolation and cross-connection valves

What should be the crew's immediate action if the telemotor system fails during critical navigation?

B) Immediately switch to the backup control system, such as the emergency electric control or manual control, to maintain steering

What is the function of the tiller in the two-ram steering gear system?

B) To transfer the linear force from the rams to the rudder stock to rotate the rudder

What is the primary advantage of using a rotary vane steering gear system compared to other types of steering gear?

B) It provides a compact design with smooth and efficient steering control.

What happens to the automatic steering system when the vessel enters manual steering mode?

B) The autopilot disengages, and the crew has full control over the steering gear.

Which component in the rotary vane steering gear system is responsible for determining the direction in which the rudder will move?

B) The directional control valve

How does the hunting gear contribute to the efficiency of a hydraulic steering gear system?

B) By minimizing unnecessary rudder movement, reducing wear and tear on the system

How does the hydraulic system ensure that the rotary vane unit can move the rudder both to port and to starboard?

B) By reversing the flow of hydraulic fluid through the directional control valve to apply pressure to the appropriate side of the rotary vane unit

In the event of a total hydraulic system failure in an electro-hydraulic steering gear, what is one method by which steering may still be achieved?

D) By using a secondary, independent hydraulic system if available

What is the main advantage of having a well-functioning hunting gear in a hydraulic steering system?

B) It provides precise and stable steering, reducing the likelihood of overcorrection and course instability.

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