DieselShip's Online Content Library

Q1. (a) Explain EACH of the following metallurgical failure mechanisms:

(i) fretting; (3)

(ii) fretting corrosion. (3)

(b) State TWO shipboard examples where fretting may occur. (2)

(c) State TWO shipboard examples where fretting corrosion may occur. (2)

Q2. (a) Describe, with the aid of a sketch, a temperature measuring instrument that uses the principle of operation of a change in resistance with the application of heat. (6)

(b) Describe how the instrument sketched in part (a) is tested and calibrated. (4)

Q3. With reference to stern tube bearings:

(a) explain why white metal lined bearings are susceptible to failure; (5)

(b) outline the merits of non-metallic bearings. (5)

Q5. (a) Describe the operation of a vacuum sewage system. (5)

(b) List the advantages of a vacuum sewage system when compared to a conventional flushing system. (4)

(c) State why untreated sewage should not be allowed to stagnate. (1)

Q5. With reference to centrifugal separators used for oily bilge duty:

(a) explain why centrifugal oily water separators are superior to those which rely on gravity (3)

(b) describe, with the aid of a sketch, how flow over the centrifugal separator plates can break down emulsions by encouraging flocculation of particles and coalescence of droplets; (5)

(c) state how the bilge overboard control valve can only operate by the Chief Engineer:(1)

(d) state a value of overboard parts per million oil content that may be set which is below the generally recommended value. (1)

Q6. (a) Sketch a single stage flash evaporator, labelling the component parts and showing the directions of flow. (5)

(b) Explain the term flash evaporation. (2)

(c) State the regulations governing the operation of an evaporator if the distilled water is intended for human consumption. (3)

Q7. (a) In deck machinery hydraulic systems, state the functions of the hydraulic oil reservoir, making reference to the volume of the hydraulic fluid in the system. (6)

(b) State FOUR reasons for machinery tripping out on high oil temperature during operation. (4)

(a) In deck machinery hydraulic systems, state the functions of the hydraulic oil reservoir, making reference to the volume of the hydraulic fluid in the system.

Q8. With reference to fixed CO2 smothering systems for ships machinery spaces:

(a) State the safety procedure that the Chief Engineer Officer should adopt with respect

to maintenance being carried out on the system by contractors whilst the vessel is in port. (3)

(b) State the procedure prior to the safe release of CO2 into the machinery space in the event of a fire. (4)

(c) Describe the factors that should be considered prior to re-entry of the machinery spaces after the release of CO2 gas. (3)