Yacht Second Engineer 060-03 Exam: Auxiliary Equipment Part I

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Questions and Answers

State four possible causes for the fault of a rising temperature in a vessel's deep freeze due to the compressor cycling.

Possible causes: Low refrigerant, faulty compressor, dirty condenser coils, malfunctioning thermostat.

Explain the procedure to rectify the fault of a rising temperature in a vessel's deep freeze due to the compressor cycling.

Procedure: Check refrigerant levels, inspect and repair/replace compressor, clean condenser coils, replace thermostat if necessary.

Describe all the necessary checks of the steering gear before a vessel leaves port.

Checks: Hydraulic fluid levels, manual steering backup, emergency power supply, rudder angle indicators, autopilot system.

Describe the advantages of using water jets instead of conventional propellers for vessel propulsion.

Advantages: Higher maneuverability, shallow draft capability, reduced cavitation, improved efficiency. Signup and view all the answers

Sketch an arrangement for the aft seal of an oil lubricated stern tube bearing.

Answer: [Provide a sketch of the arrangement] Signup and view all the answers

Describe, with the aid of a sketch, a cartridge type fuse.

Answer: [Provide a description and sketch of a cartridge type fuse] Signup and view all the answers

State why a fuse used in a motor circuit differs from a fuse used in a lighting circuit.

Reason: Motor circuits have higher inrush current and may require a different fuse rating to handle the initial surge. Signup and view all the answers

Describe the operation of a preferential trip.

Operation: Prioritizes certain circuits over others during power loss to maintain essential services. Signup and view all the answers

State the type of circuits that cannot be connected to the preferential trip, listing three examples.

Circuits: Non-essential systems, non-critical lighting, non-essential HVAC. Signup and view all the answers

State the purpose of remotely operated quick closing valves.

To quickly close off a system in case of emergency. Signup and view all the answers

Describe where remotely operated quick closing valves would be fitted.

They would be fitted in critical areas of the system that need immediate shutdown in emergencies. Signup and view all the answers

Explain why a relief valve is needed for positive displacement pumps and where it would be fitted.

A relief valve is needed to prevent overpressure and would be fitted on the discharge side of the pump. Signup and view all the answers

Describe when a pulsation damper may be fitted to the delivery line of a positive displacement pump and how it works.

A pulsation damper may be fitted to reduce pressure fluctuations and it works by absorbing the pulsations in the flow. Signup and view all the answers

Sketch a starting air reservoir and label all mountings.

Answers may vary in terms of specific details. Signup and view all the answers

State two methods by which the interior surface of a large air reservoir may be protected against corrosion.

Possible answers: coating with anti-corrosive material, periodic cleaning and maintenance. Signup and view all the answers

State possible sources of water contamination in hydraulic systems.

Possible sources: leaks, condensation, improper maintenance. Signup and view all the answers

Explain the possible consequences of water contamination in hydraulic systems.

Possible consequences: component damage, reduced system efficiency, increased maintenance costs. Signup and view all the answers

Describe the actions to be taken if water contamination is suspected in a hydraulic system.

Possible actions: drain and flush the system, replace contaminated components, investigate and rectify the source of contamination. Signup and view all the answers

Study Notes

Rising Temperature in Deep Freeze Due to Compressor Cycling

Possible causes include inadequate refrigerant, faulty compressor, blocked condenser, or poor insulation.
To rectify the issue: Check refrigerant levels, inspect the compressor for wear or malfunction, ensure proper airflow by cleaning condenser coils, and verify insulation integrity.

Steering Gear Checks Before Leaving Port

Conduct visual inspections for wear or damage on all components.
Test functional operational checks to ensure responsiveness of the steering gear.
Check hydraulic fluid levels and quality.
Inspect the connections and secure all fittings and hoses for leaks.

Advantages of Water Jets Over Conventional Propellers

Higher maneuverability and ability to operate in shallow waters.
Reduced risk of damage to marine life and surrounding structures.
Enhanced efficiency in terms of thrust-to-power ratio.
Lower maintenance requirements due to fewer moving parts.

Aft Seal of Oil Lubricated Stern Tube Bearing

Arrange comprises of a sealing element, sealing rings, and a supply of lubricating oil.
Sketch would depict the stern tube bearing with an emphasis on sealing mechanisms and oil lubrication pathways.

Cartridge Type Fuse

Cartridge fuses encapsulate the element in a protective casing.
They have clear visibility for the blown condition and are easily replaceable.
Sketch would illustrate a cylindrical body with end caps, showing the current-carrying element inside.

Fuse Differences for Motor and Lighting Circuits

Motor circuit fuses must handle inrush currents and potential overloads, requiring higher ratings.
Lighting circuit fuses are designed for lower continuous loads without surges, leading to different specifications in sensitivity.

Operation of a Preferential Trip

Performs automatic disconnection of non-essential circuits during overloads.
Ensures that critical functions maintain power while minimizing risk to the system.

Circuits Not Connectable to Preferential Trip

Emergency lighting circuits, safety systems, and vital navigational equipment cannot be connected.
Ensures that essential systems remain operational in case of overload situations.

Remotely Operated Quick Closing Valves

Designed to swiftly shut off fluid flow to prevent excessive pressure build-up or flooding.
Enhance safety and control during emergencies or system faults.

Fitting Locations for Remotely Operated Quick Closing Valves

Installed on fuel lines, cargo systems, and ballast water systems to allow instant response.

Importance of a Relief Valve in Positive Displacement Pumps

Protects the pump and piping from excessive pressure by diverting fluid when limits are exceeded.
Typically fitted at the discharge side or directly connected to the pump outlet.

Pulsation Damper in Positive Displacement Pump Delivery Line

Installed to smooth out pressure fluctuations, preventing pipe vibrations and potential fatigue.
Operates by using a gas-filled chamber that absorbs pressure spikes.

Starting Air Reservoir Arrangement

Structure comprises inlet and outlet connections, pressure gauge, and pressure relief valves.
Sketch would depict the entire setup, labeling all components clearly for identification.

Corrosion Protection Methods for Large Air Reservoirs

Application of protective coatings to the interior surfaces to inhibit rust.
Installation of sacrificial anodes that corrode preferentially to protect the reservoir wall.

Sources of Water Contamination in Hydraulic Systems

Leaks from seals or gaskets, condensation from temperature changes, or external water intrusion.
Poor maintenance practices leading to ingress from the environment.

Consequences of Water Contamination in Hydraulic Systems

Reduced lubrication effectiveness, leading to increased wear or catastrophic failure.
Formation of emulsions that hinder fluid operation and cause system hydraulics to malfunction.

Actions for Suspected Water Contamination in Hydraulic Systems

Stop the system operation and drain the contaminated fluid.
Inspect and replace filters, followed by refilling the system with clean hydraulic fluid.
Conduct thorough checks to identify and rectify the source of contamination.

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Description

Prepare for the Yacht Second Engineer 060-03 exam on Auxiliary Equipment Part I administered by the Scottish Qualifications Authority. The exam will be held on 18th May 2018 from 1400 to 1600 hrs. Candidates are allowed to use non-programmable calculators and are required to show all formulae and intermediate steps clearly.