Small Vessel Second Engineer Certification Exam: Auxiliary Equipment Part I

Questions and Answers

State FIVE indications that a fault has occurred in a centrifugal pump/motor set.

Abnormal noise 2. Vibration 3. High temperature 4. Leakage 5. Low pressure

State a possible cause of each of the faults mentioned in the previous question.

Misalignment 2. Imbalance 3. Overloading 4. Seal failure 5. Blockage

Explain how a relief valve suitable for use on the air side of a compressor is reset after overhaul.

The relief valve is reset by adjusting the spring tension to the specified pressure according to manufacturer's instructions.

Describe a pressure reducing valve suitable for supplying control air from the main starting air supply.

A pressure reducing valve reduces the high pressure from the main starting air supply to a lower controlled pressure suitable for control air usage. Signup and view all the answers

Describe THREE types of wastage that may occur on the internal surfaces of a ship's side valve made of modular cast iron.

<ol> <li>Corrosion 2. Erosion 3. Cavitation</li> </ol> Signup and view all the answers

Sketch a relief valve suitable for use on the air side of a compressor.

Sketch of a relief valve suitable for use on the air side of a compressor. Signup and view all the answers

Sketch a pressure reducing valve suitable for supplying control air from the main starting air supply.

Sketch of a pressure reducing valve suitable for supplying control air from the main starting air supply. Signup and view all the answers

Where should refrigerant gas bottles be stored?

In a well-ventilated area away from direct sunlight and sources of heat. Signup and view all the answers

What is the weakest part of a storage bottle for refrigerant?

The valve. Signup and view all the answers

How can it be determined if refrigerant has been leaking from gas bottles?

By checking for hissing sounds or using a leak detection solution. Signup and view all the answers

State the TWO methods of recharging a refrigeration system and where the connection to the system should be made for EACH method.

<ol> <li>Liquid Charging - Connect to the low-pressure side. 2. Vapor Charging - Connect to the high-pressure side.</li> </ol> Signup and view all the answers

How should excessive refrigerant be removed from the system without infringing MARPOL regulations?

By using a refrigerant recovery unit to capture and safely dispose of the excess refrigerant. Signup and view all the answers

Explain the meaning of '100% redundancy' in steering gears.

Having a complete backup system that can fully take over in case of failure. Signup and view all the answers

What is 'single failure criteria' in steering gears?

The requirement that the system continues to operate even if a single component fails. Signup and view all the answers

Describe a pilgrim nut and its usage in ensuring correct fitting of a keyless propeller.

A pilgrim nut is a threaded component that moves along a shaft to adjust propeller pitch. It ensures the propeller is securely attached without a key. Signup and view all the answers

Describe the construction of a salient pole a.c. generator rotor.

The rotor has projecting poles with field windings wrapped around them. These poles create the magnetic field necessary for power generation. Signup and view all the answers

How many poles would be required for a 50Hz supply and a rotational speed of 750rpm in an a.c. generator?

Four poles are required for a 50Hz supply at 750rpm. Signup and view all the answers

What are the requirements for an internal light fitting in battery lockers?

The light fitting should be explosion-proof, securely fixed, and battery-powered. Signup and view all the answers

Why are the requirements for an internal light fitting in battery lockers necessary?

These requirements prevent the risk of explosion due to sparks from electrical components. Signup and view all the answers

Study Notes

Small Vessel Second Engineer 060-03 - Auxiliary Equipment Part I

The examination is administered by the Scottish Qualifications Authority on behalf of the Maritime and Coastguard Agency.
The examination is 2 hours long, from 1400-1600 hrs.
Non-programmable calculators are permitted, and all formulae used must be stated with clear working and intermediate steps.

Auxiliary Equipment

Types of wastage that can occur on the internal surfaces of a ship's side valve made of modular cast iron:
- Three types of wastage
Centrifugal Pump/Motor Set:
- Five indications of a fault:
- Possible cause of each fault
Relief Valve:
- Sketch of a relief valve suitable for use on the air side of a compressor
- Explanation of how the valve is reset after overhaul
Pressure Reducing Valve:
- Description with a sketch of a pressure reducing valve suitable for supplying control air from the main starting air supply

Refrigeration System

Safe storage and handling of refrigerant:
- Storage location of refrigerant gas bottles
- Weakest part of the storage bottle
- How to determine if refrigerant has been leaking from gas bottles
- Two methods of recharging a refrigeration system, including connection points
- How to remove excessive refrigerant from the system without infringing MARPOL regulations

Steering Gears

Definition of:
- 100% redundancy
- Single failure criteria

Propeller and Thrust Bearing

Description with a sketch of a pilgrim nut
Explanation of how the pilgrim nut is used to ensure correct fitting of a keyless propeller
Inspection of a main thrust bearing

Salient Pole A.C. Generator Rotor

Description of the construction of a salient pole a.c. generator rotor
Calculation of the number of poles required for a 50Hz supply, rotational speed of 750rpm

Battery Lockers

Requirements for an internal light fitting
Explanation of why the requirements are necessary

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