Welcome to your MED 3 Engineering Knowledge Assessment Assessment Online
Student Assessment Instructions
1. This is a closed book Assessment.
2. The video link between the student and the supervisor is to remain on throughout the assessment.
3. All notes, books and mobile phones are to be removed from the table.
4. Mobile phones are to be turned off and not used during the assessment.
5. Students should read each question carefully before answering.
6. All questions are to be answered.
7. No communication is permitted other than with the Assessment Supervisor.
8. No student may leave the room for the duration of the Assessment.
9. When instructed you may commence the Assessment.
10. To pass, you must obtain a 70% or higher mark.
Two fuel tanks each measure 2100 mm in length, 1200 mm in height and 980 mm in width.a. Calculate the vessel’s total capacity.
Calculations are required to 2 decimal places.
b. How far can the vessel travel consuming 52 litres per hour at 9.8 knots and maintain a reserve of 20% if each tank dipped 950 mm.
2. Describe in detail the working cycle of a 4 stroke diesel engine. Include in your answer how ignition takes place.
3. a. Explain the passage and function of lubricating oil in a wet sump diesel engine.
b. State the action you would take if the engine oil operating pressure dropped from 60 to 5 psi.
4. What is meant by a 2 : 1 reduction in relation to propulsion
5. Describe in detail a heat exchanger cooling system for a marine diesel engine and gear box. Include all components of the raw water and coolant system.
6. Describe the procedure to refuel a vessel
7. a. Explain how you would bleed/prime a four stroke diesel engine.
b. Give two reasons why it may be necessary to bleed/prime a diesel engine
8. a. Sketch and label a typical bilge pumping system incorporating a valve manifold and deck wash.
b. Give two reasons why a bilge pumping system may malfunction
9. State two checks you would make to your hydraulic steering system before departing the berth.
10. Sketch a refrigeration plant. Identify all components and explain their functions
11. List the major components of an alternator and describe its operation
12. a. Sketch two 12 volt 50 amp hour batteries in parallel and series and state their resulting voltage and capacity
b. Give two reasons why circuit breakers are fitted to an electrical circuit
13. Explain how sacrificial anodes protect metal fittings immersed in salt water
14. Describe the operation of a pre-engaged starter motor
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