Marine Diesel Engineering Exam - Feb 2020 PDF

CERTIFICATES OF COMPETENCY FOR ENGINEERS (YACHT) EXAMINATIONS ADMINISTERED BY THE SCOTTISH QUALIFICATIONS AUTHORITY ON BEHALF OF...

CERTIFICATES OF COMPETENCY FOR ENGINEERS (YACHT) EXAMINATIONS ADMINISTERED BY THE SCOTTISH QUALIFICATIONS AUTHORITY ON BEHALF OF MARITIME AND COASTGUARD AGENCY SMALL VESSEL SECOND ENGINEER 060-01 - MARINE DIESEL ENGINEERING FRIDAY, 07 February 2020 1400-1600 hrs Examination paper inserts: Notes for the guidance of candidates: 1. Candidates should note that 100 marks are allocated to this paper. To pass candidates must achieve 50 marks. 2. Non-programmable calculators may be used 3. All formulae used must be stated and the method of working and ALL intermediate steps must be made clear in the answer. Materials to be supplied by examination centres: Candidate's examination workbook MARINE DIESEL ENGINEERING Attempt ALL questions Marks for each part question are shown in brackets 1. (a) With reference to the combustion of fuel, explain EACH of the following terms: (i) atomisation; (3) (ii) penetration; (2) (iii) compression ratio. (1) (b) State the factors which influence the terms explained in part (a). (4) 2. With reference to poor turbocharger performance: (a) state FOUR possible causes; (4) (b) describe the possible indications. (6) 3. With reference to engine timing belts or chains: (a) state the cause of loss of timing drive tension; (2) (b) state how this will affect the engine; (6) (c) explain how slight loss of tension can be corrected. (2) 4. (a) Sketch an overspeed trip of the centrifugal type. (6) (b) Describe the operation of the overspeed trip sketched in part (a). (4) 5. (a) List FIVE products directly obtained from the distillation of Crude Oil, stating a typical use for EACH on board a vessel. (5) (b) With reference to ISO 8217, aluminium & silicon oxides in fuel, state EACH of the following: (i) how they get there; (2) (ii) what effect they will have on engine performance; (2) (iii) how they are removed from the fuel. (1) 6. Describe the engine and system problems created by EACH of the following common contaminants in distillate fuel oil: (a) water; (3) (b) solids; (3) (c) microbes. (4) 7. Describe, with the aid of a sketch, the operation of a centrifugal type lubricating oil filter, labelling the MAIN components. (10) 8. Describe possible reasons for variations in the oil level of a main engine sump. (10) 9. With reference to pneumatic clutches used for medium speed main propulsion purposes: (a) describe the operating principle of the clutch; (5) (b) explain how this clutch may be engaged in the event of failure of the control system; (3) (c) state TWO interlocks necessary for clutch operation. (2) 10. With reference to a gearbox: (a) explain why large quantities of lubricating oil are used; (2) (b) state FOUR possible causes of excessive lubricating oil temperature when at normal operating speeds; (4) (c) state how EACH cause stated in part (b) may be remedied. (4)