18 Questions
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.
Sketch an arrangement for the aft seal of an oil lubricated stern tube bearing.
Answer: [Provide a sketch of the arrangement]
Describe, with the aid of a sketch, a cartridge type fuse.
Answer: [Provide a description and sketch of a cartridge type fuse]
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.
Describe the operation of a preferential trip.
Operation: Prioritizes certain circuits over others during power loss to maintain essential services.
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.
State the purpose of remotely operated quick closing valves.
To quickly close off a system in case of emergency.
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.
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.
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.
Sketch a starting air reservoir and label all mountings.
Answers may vary in terms of specific details.
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.
State possible sources of water contamination in hydraulic systems.
Possible sources: leaks, condensation, improper maintenance.
Explain the possible consequences of water contamination in hydraulic systems.
Possible consequences: component damage, reduced system efficiency, increased maintenance costs.
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.
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.
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