Q1. State, with reasons, EIGHT areas or items which should be checked by the duty engineer before taking over the watch. (16)
Q2. With reference to diesel engine turbochargers, describe the functions served by the following parts:
(a) Inducer (2)
(b) Diffuser (4)
(c) Volute casing (2)
(d) Nozzle ring (2)
(e) Fir-tree blade root (4)
(f) Damping Wire (2)
Q3. With reference to the diesel engine cooling system:
(a) Explain why cooling is necessary (4)
(b) State the purpose of EACH of the following:
(i) Jacket water heater (4)
(ii) Jacket water drain tank (4)
(iii) Header tank (4)
Q4. With reference to a small diesel engine that requires the use of a starting handle:
(a) State the procedure for starting (8)
(b) State EIGHT reasons that would cause difficulty in starting (8)
Q5. With reference to auxiliary boilers:
(a) Explain how scale forms on the heating surfaces (8)
(b) State TWO reasons why scale is undesirable (4)
(c) State how scale build up is prevented from forming in steam boilers (4)
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