Questions and Answers
Describe two methods for remote actuation of tank quick closing valves.
Two methods for remote actuation of tank quick closing valves are hydraulic and pneumatic systems.
Explain how cavitation damage occurs within a pump.
Cavitation damage in a pump occurs when vapor bubbles implode near the impeller, causing erosion and pitting of the metal surface.
Sketch a starting air reservoir, labeling all mountings.
Answers may vary, but should include key components like safety valves, pressure gauges, drain valves, and pressure switches.
State two coatings that can be used to protect the interior surface of a large air reservoir against corrosion.
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State two operational causes of increased cavitation within a pump.
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Explain why tank quick closing valves are fitted.
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Discuss the importance of non-programmable calculators in the examination.
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Why must candidates state all formulae used and show all intermediate steps in their answers?
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State one advantage and one disadvantage of a compressed air system compared to a hydraulic system.
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Why is it desirable to remove moisture from the air?
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Why is it desirable to limit oil carry over?
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Describe how the removal of moisture from the air is achieved.
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Describe how the limiting of oil carry over is achieved.
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Why are spherical bearings required on the ram ends of steering gears?
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How may maneuvering be maintained if the control system fails for a vessel with a single electro/hydraulic controllable pitch propeller?
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What action should be taken if the hydraulic system irreparably fails while on route and the blades assume zero pitch?
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Describe the tightening procedure for main propulsion shaft hydraulic sleeve type couplings.
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How is it determined that the push fit is complete in main propulsion shaft hydraulic sleeve type couplings?
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Explain how a new motor is aligned with an existing pump.
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State three checks that should be made before using the pump after the motor has been aligned.
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Study Notes
Certificates of Competency for Engineers (Yacht) Examinations
- The examination is administered by the Scottish Qualifications Authority on behalf of the Maritime and Coastguard Agency.
- The examination consists of 100 marks, and candidates must achieve 50 marks to pass.
Auxiliary Equipment Part I
- The examination paper includes questions on auxiliary equipment, and candidates must attempt all questions.
Tank Quick Closing Valves
- Two methods for remote actuation of tank quick closing valves are:
- Method 1 (sketch required)
- Method 2 (sketch required)
- These valves are typically fitted in:
- Location ( specify)
- The purpose of fitting tank quick closing valves is:
- Reason ( specify)
Pump Cavitation
- Cavitation damage occurs within a pump due to:
- Explanation
- Two operational causes of increased cavitation within a pump are:
- Cause 1 (with reasons)
- Cause 2 (with reasons)
Starting Air Reservoir
- A starting air reservoir includes the following mountings:
- Mounting 1 (label)
- Mounting 2 (label)
- ... (and so on)
- Two coatings that can be used to protect the interior surface of a large air reservoir against corrosion are:
- Coating 1
- Coating 2
Air Compressors and Pneumatic Control Systems
- One advantage of a compressed air system compared to a hydraulic system is:
- Advantage
- One disadvantage of a compressed air system compared to a hydraulic system is:
- Disadvantage
- Removing moisture from the air is desirable because:
- Reason
- Limiting oil carry over is desirable because:
- Reason
- Removal of moisture from the air is achieved by:
- Method
- Limiting oil carry over is achieved by:
- Method
Two Ram Steering Gears
- A two ram steering gear arrangement includes:
- Spherical bearings
- Rams and tiller
- Fittings (sketch required)
- Spherical bearings are required on the ram ends because:
- Reason
Electro/Hydraulic Controllable Pitch Propeller
- If the control system fails, manoeuvring can be maintained by:
- Method
- If the hydraulic system irreparably fails whilst on route and the blades assume zero pitch, the action to be taken is:
- Action
Main Propulsion Shaft Hydraulic Sleeve Type Couplings
- The tightening procedure for main propulsion shaft hydraulic sleeve type couplings involves:
- Steps (with sketch)
- The push fit is complete when:
- Determination method
Motor Alignment
- Aligning a new motor with an existing pump involves:
- Steps (with sketch)
- Three checks to be made before using the pump after the motor has been aligned are:
- Check 1
- Check 2
- Check 3
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