Q2. (a) Explain EACH of the following control terms:
(i) cascade; (2) (ii) split range. (2)
(b) Describe, with the aid of a sketch, a control system that may be enhanced by the inclusion of cascade control. (6)
Q4. State the inspections, instructions and maintenance that should be carried out on main sea water pipelines, strainers and ship's side valves to minimise the risks of engine room flooding. (10)
Q5. (a) Describe TWO systems of priming centrifugal pumps. (6)
(b) List the advantages of EACH of the priming methods described in part (a). (4)
Q7. With reference to the lubrication of refrigeration compressors:
(a) state the advantage of using fully synthetic oils; (2)
(b) explain why oil may be carried over from the compressor; (3)
(c) describe a device which returns oil from the compressor discharge to the compressor sump; (3)
(d) state TWO reasons why an accumulation of oil in the evaporator is undesirable. (2)
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