DieselShip's Online Content Library

Q1. (a) Discuss the merits of a condition monitoring system compared to other maintenance regimes. (5)

(b) Describe how the data is gathered, stored and evaluated on a computer-based vibration analysis system. (5)

Q2. Discuss the advantages and disadvantages of electrical remote monitoring and control systems compared to pneumatic systems. (10)

Q3. (a) Sketch an engine room fresh water central cooling system, indicating the water temperatures at salient points on the system. (6)

(b) State, with reasons, FOUR advantages of the system sketched in part (a) compared to one which is totally sea water cooled. (4)

Q4. With reference to centrifugal pumps and pumping systems:

(a) explain, with the aid of a diagram, the distinction between Net Positive Suction Head available (NPSHa) and Net Positive Suction Head required (NPSHr); (8)

(b) explain how the NPSHa may be increased by design. (2)

Q5. Describe, with the aid of a block diagram, a compensated control system for an active fin stabilisation unit

Q6. With reference to a domestic refrigeration plant, state TWO causes of EACH of the following

conditions, stating how EACH cause may be rectified:

(a) excessive pressure; (2)    (b) low pressure at evaporator suction; (2)

(c) compressor cycling; (2)   (d) compressor running for long periods but not lowering the temperature in the cold rooms(2)              (e) compressor operating noisily. (2)

Q7. (a) Explain the principles of osmosis and reverse osmosis. (4)

(b) Describe how reverse osmosis is used for the production of fresh water on board ship(4)

(c) State the limitation of the quality of the permeate in a single pass reverse osmosis system, describing how the quality of the permeate could be improved. (2)

Q8. The company, with which you are employed, requests that all Chief Engineer Officers prepare standing orders regarding the prevention and detection of fires in the machinery spaces. Compile such a list of recommendations to be submitted to central office. (10)

Q9. With reference to automatic Power Management Systems for the control of the operation of main switchboards and generators:

(a) list the features that the Power Management System controls in order to comply with the requirements for a vessel; (7)

(b) explain how the generators and switchboard would be controlled following a failure of the Power Management System. (3)

Q10. Describe, with the aid of a block diagram, the operation of a load sensing electronic governor controller for an a.c. generator. (10)

Q11. With reference to a THREE phase electrical distribution system:

(a) discuss the advantages and disadvantages of an insulated neutral system; (8)

(b) state how an earthed neutral system is earthed and the measures taken to limit the maximum earth fault current. (2)

Q12. (a) State, with reasons, the potential hazards that may be present in EACH of the following spaces:

(i) an oily bilge tank; (2)      (ii) a ballast tank; (2)           (iii) a refrigerated space. (2)

(b) State the procedures to be undertaken prior to entering enclosed spaces. (4)

Q13. (a) Explain why twin skeg rudders may be fitted on some vessels. (3)

(b) Explain the advantages of a twin skeg installation in modern vessels with a large cargo carrying capacity. (7)

Q14. (a) State the system of classification for access doors passing through watertight bulkheads of a vessel. (3)

(b) State THREE circumstances under which all watertight doors must be closed when situations are defined as potentially hazardous. (3)

(c) Explain the safety features built into the watertight door operating system to enhance safety to personnel. (4)