Q1. Crankcase oil mist detectors have undergone a lot of changes in recent years. Compare the modern types with multiple sensor units with the traditional single sensor type, where sampling was done sequentially. What is meant be addressable sensors.
Q4. (a) Explain how the build-up of residue in the scavenge space of a large slow speed two stroke engine is minimised by design, operation, and maintenance.
(b) Explain the possible damage which could be caused by a scavenge fire.
Q9. a) Describe, with the aid of a sketch, a main engine cylinder relief valve. (10)
b) List the conditions, which may cause the valves, sketched in (a) to lift. (6)
Q2. a) Sketch a cylinder relief valve suitable for a large slow speed engine.
b) Describe its salient design features.
c) State the purpose of fitting such a device.
d) State the possible circumstances when the relief valve may lift and indicate the action to be taken to prevent damage to the engine.
Q5. a) Identify the factor, which could be responsible for initiation and propagation of explosions in air starting systems. (4)
b) Explain how the possibility of an explosion in an air start system is minimized. (4)
c) Describe the devices required for air start systems, which are intended to dissipate the energy of an explosion. (4)
d) Suggest why one type of safety addition, although appearing to operate correctly, may not prevent a server air start line explosion and loss of life. (4)
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