Marine Diesel Engineering Exam - Jan 2018 - 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, 19 January 2018 1400-1600 hrs Examination paper inserts: Notes for the guidance of candidates: 1. Non-programmable calculators may be used. 2. 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: MARINE DIESEL ENGINEERING Attempt ALL questions Marks for each part question are shown in brackets 1. Explain the meaning of EACH of the following diesel engine terms: (a) overlap; (2) (b) scavenging; (2) (c) afterburning; (2) (d) compression; (2) (e) expansion. (2) 2. (a) Explain why air coolers are fitted after main engine turbo chargers. (6) (b) Explain the effects of undercooling the charge air on the engine. (4) 3. (a) Show, using sketches, the THREE clearances necessary for efficient piston ring functioning. (3) (b) Explain why piston rings are necessary. (2) (c) Explain why the clearances sketched in part (a) are necessary. (5) 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) Explain what is meant by EACH of the following fuel terms: (i) cloud point; (2) (ii) compatibility. (2) (b) Describe how to avoid fuel system and engine related problems with reference to the TWO terms in part (a) (6) 6. Describe, with the aid of a sketch, a coalescer type distillate fuel oil filter. (10) 7. Describe how the lubricating oil of a large medium speed diesel engine may be assessed on board. (10) 8. With reference to the operation of an air starting system of a large medium speed marine diesel engine fitted with individual air starting valves: (a) state the checks to be carried out if the engine will not start when initiating the start sequence; (6) (b) list FOUR safety devices fitted to the air start system. (4) 9. (a) Describe how to calibrate a diesel engine cylinder liner, already removed from the engine. (6) (b) State the precautions that should be taken during initial startup when putting a new liner into service. (4) 10. Describe, with the aid of a sketch, an epicyclic planetary reduction gear. (10)