DieselShip's Online Content Library

Q1. (i) Discuss the use of non-metals onboard ships & name some of the common nonmetals used. (4)

(ii) What are their areas of application on ships? (4)

(iii) Name the advantages & also the limitations in using non-ferrous materials (8)

Q2) (a) Sketch a two-ram type hydraulic steering gear with a single Electro-hydraulic pumping unit. Show the hunting gear arrangement and indicate valve positions (8)

(b) State the purpose of, and describe the operation of:

(i) Hydraulic shock/buffer valves (3)

(ii) Oil replenishing tank (2)

(iii) Hunting gear (3)

Q3. Explain how each of the following conditions contribute to the satisfactory performance of oil centrifuges.

(a) Correct bowl speed (4)

(b) Cleanliness of bowl (4)

(c) Low rate of feed to bowl (4)

(d) Contaminated oil allowed to stand for an appreciable time prior to centrifuging. (4)

Q4) Describe with the aid of suitable graph, the discharge characteristics of a centrifugal pump. Explain why it does not require a relief valve (16)

Q5) With regard to a reciprocating refrigerator compressor.

(a) Sketch the mechanical shaft seal showing its component parts and how it is lubricated (8)

(b) Describe the sealing arrangement stating the materials used for the component parts (4)

(c) State the effect on the environment of the release of refrigerants into the atmosphere (4)

Q6) (a) Sketch an auxiliary boiler ‘blow down’ valve. Explain how it differs from its shipside counterpart (10)

(b) Describe the sequence of ‘blow down’ procedure (6)

Q7) Submit a report to the Chief Engineer stating how the freshwater generator output on board you ship was increased to near optimal values. The report should specifically mention the adjustments, corrections and improvements executed (16)

Q8. i) Sketch and describe a fuel system diagram for a 2 stroke Marine diesel engine from storage / service tank to fuel injectors. Show the various components and fittings which are provided in the circuit. What is the purpose of mixing columns & autode-aerating valve? (16)

Q9. a) Bunkering as a shipboard operation has its own significance. List out the important inspects of a bunkering operation including the preparation and precaution to be taken to ensure a safe operation. (8)

b) What does the Bunker specification include and how does it affect the engines adversely? Name at least three such ingredients that you expect in a Heavy Fuel Oil bunker and the effects on the engine operation. (8)