DieselShip's Online Content Library

Q1. State a typical shipboard application for EACH of the following metals, explaining how their properties make them particularly suitable for the stated application:

(a) Stainless steel (2)

(b) Grey cast iron (2)

(c) Titanium (2)

(d) Manganese bronze (2)

(e) Aluminium (2)

Q2. With reference to machinery condition monitoring systems:

(a) State what is meant by machinery condition monitoring; (2)

(b) State the means available for gathering data; (3)

(c) Describe how the data is used to indicate machinery condition trends; (3)

(d) Explain the relevance of machinery condition monitoring to approved planned maintenance systems. (2)

Q3. Describe, with the aid of a sketch, the principle of operation of a radial lip stern tube sealing arrangement for an oil filled stern tube, which incorporates an air space and is designed to prevent pollution. (10)

Q4. a) Describe a vacuum sewage system. (5)

b) List the advantages of the system described in part (a). (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 be operated 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. With reference to refrigeration systems:

(a) Explain why undercooling of the refrigerant at the condenser outlet is desirable. (3)

(b) Describe, with the aid of a sketch, how a heat exchanger could be incorporated in the circuit to enhance undercooling. (5)

(c) Explain the possible consequences of the refrigerant having a dryness fraction at the compressor suction. (2)

Q7. With reference to fixed firefighting systems employing fresh water in a high fog or mist form, explain EACH of the following.

(a) How the fire is contained and extinguished (4)

(b) The importance of particle size and flow rate (4)

(c) State the means by which the system may be activated (2)

Q8. With reference to the 2023 International Maritime Organisation (IMO) strategy on the reduction of greenhouse gas emissions from ships:

a) State FOUR operating practices that may be adopted on board ship to comply with the IMO requirement to reduce CO2 emission levels.

b) Explain what is meant by EACH of the following:

(i) CII

(ii) EEDI

(iii) EEXI