Podcast
Questions and Answers
What is the purpose of remotely operated quick closing valves?
What is the purpose of remotely operated quick closing valves?
Where would remotely operated quick closing valves typically be fitted?
Where would remotely operated quick closing valves typically be fitted?
Why is a relief valve necessary in positive displacement pumps?
Why is a relief valve necessary in positive displacement pumps?
When might a pulsation damper be fitted to the delivery line of a positive displacement pump?
When might a pulsation damper be fitted to the delivery line of a positive displacement pump?
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What are possible sources of water contamination in hydraulic systems?
What are possible sources of water contamination in hydraulic systems?
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What actions should be taken if water contamination is suspected in a hydraulic system?
What actions should be taken if water contamination is suspected in a hydraulic system?
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How can the interior surface of a large air reservoir be protected against corrosion?
How can the interior surface of a large air reservoir be protected against corrosion?
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Which of the following could be a possible cause for the compressor cycling in the deep freeze?
Which of the following could be a possible cause for the compressor cycling in the deep freeze?
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Which step should be taken first to rectify the compressor cycling issue?
Which step should be taken first to rectify the compressor cycling issue?
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Which of the following checks should be performed on the steering gear before leaving port?
Which of the following checks should be performed on the steering gear before leaving port?
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What is a potential advantage of using water jets instead of conventional propellers for vessel propulsion?
What is a potential advantage of using water jets instead of conventional propellers for vessel propulsion?
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In the sketch for the aft seal of an oil-lubricated stern tube bearing, which component is responsible for preventing water ingress?
In the sketch for the aft seal of an oil-lubricated stern tube bearing, which component is responsible for preventing water ingress?
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What is the primary purpose of a cartridge type fuse?
What is the primary purpose of a cartridge type fuse?
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Why might a fuse used in a motor circuit differ from a fuse used in a lighting circuit?
Why might a fuse used in a motor circuit differ from a fuse used in a lighting circuit?
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Study Notes
Remotely Operated Quick Closing Valves
- Prevent the escape of potentially dangerous fluids, such as oil or gas
- Fitted in pipelines where there is a risk of a sudden release of fluid, such as oil tankers or gas pipelines
Relief Valves in Positive Displacement Pumps
- Protect the pump from damage caused by excessive pressure buildup
- Necessary because positive displacement pumps continue to generate pressure even when the outlet is closed
Pulsation Dampeners
- Fitted to the delivery line of a positive displacement pump to minimize pressure fluctuations
- Reduce noise and vibration, extending the service life of the pump and associated piping
Water Contamination in Hydraulic Systems
- Sources include: condensation, ingress from the environment, leaks in the hydraulic fluid reservoir, and contamination during maintenance
- Can cause corrosion, wear, and reduced performance in the hydraulic system
Actions to be Taken If Water Contamination Is Suspected
- Investigate and identify the source of contamination
- Replace contaminated hydraulic fluid with new, dry fluid
- Consider flushing the entire hydraulic system to remove all traces of water
Protecting Large Air Reservoirs from Corrosion
- Apply a corrosion-resistant coating to the interior surface
- Use a desiccant to absorb moisture from the air
Compressor Cycling in the Deep Freeze
- Possible causes: refrigerant leak, blocked air filter, malfunctioning thermostat, or low refrigerant charge
- First step in rectification: check the thermostat's function
Steering Gear Checks Before Leaving Port
- Verify steering gear operation
- Inspect steering hydraulic system for leaks
- Check the condition of the steering gear pump, motor, and linkages
Advantages of Water Jets for Vessel Propulsion
- Increased maneuverability, particularly at low speeds
- Reduced noise and vibration
- Potential for increased efficiency
Aft Seal in an Oil-Lubricated Stern Tube Bearing
- The "lip seal" is responsible for preventing water ingress
Cartridge Type Fuses
- Primarily designed to protect electrical circuits from overcurrents and short circuits
Fuse Differences in Motor and Lighting Circuits
- Motors require higher amperage fuses than lighting circuits due to the higher starting current of motors
- This ensures adequate protection for the motor and prevents unnecessary fusing during operation
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Description
Prepare for the Yacht Second Engineer Certification exam on Auxiliary Equipment Part I administered by the Scottish Qualifications Authority on behalf of the Maritime and Coastguard Agency. The exam took place on Friday, 18 May 2018 from 1400-1600 hrs. Candidates are allowed to use non-programmable calculators and must show all working and intermediate steps in their answers.
