Q2. a. Describe, with the aid of a sketch, a main engine fuel oil circulating system incorporating the MGO and HFO service tanks, a fuel change over system, heating and viscosity control system and tank return system. (10)
b. Write instructions for changing the system described in part (a) of the question from MGO to HFO, indicating the checks to be made during the changeover. (6)
Q7. A. Describe how crosshead bearing and guide clearances can be checked. (6)
b. Describe, with the aid of a sketch, the procedure for checking the condition of a crosshead engine bottom end bearing surface. (10)
Q6. A significant number of machinery failures are due to poor maintenance techniques.
State, with reasons, the possible consequences of poor maintenance techniques on EACH of the following:
(a) Main engine lubricating oil self-cleaning filters. (4)
(b) Cylinder liner honing. (4)
(c) Auxiliary engine bottom end bearing overhaul. (4)
(d) Fitting of piston compression and oil control rings. (4)
Q3. With reference to engine operation:
a) State, with reasons, the symptoms which would indicate a cylinder head had cracked between the combustion chamber and the water space. (4)
b) describe the actions that should be taken if the engine with the symptoms in part (a) cannot be immediately stopped. (6)
c) write a report to the Superintendent outlining the probable cause and actions to prevent further occurrence.
Q4. (a) List TWO automatic main engine slowdown parameters, stating why EACH is applied to an engine. (4)
(b) List Two automatic main engine shutdown parameters, stating why EACH is applied to an engine. (4)
(c) Explain how EACH of the parameters listed in part (a) and part (b) are tested for the correct operation. (8)
Q1. (a) Explain why an engine may fail to start on air when the start air receiver is fully charged and the air receiver outlet to the engine is open.(10)
b) Describe how problems with air start systems may be avoided. (6)
Q5. (a) Describe the sequence of events that may lead to a crankcase explosion. (6)
(b) Describe an oil mist detector, explaining how it operates. (8)
(C) Describe how an oil mist detector operation is checked for accuracy. (2)
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