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Q1. With reference to diesel engine maintenance:

a) Describe the various means that are available to check the condition of a diesel engine as a guide to when maintenance is actually needed. (8)

b) Compare the methods described in part (a) with the use of planned maintenance schemes. (8)

Q9. Describe how an auxiliary boiler would be blown down and opened up for inspection. State the Precautions which should be taken during the inspection and when boxing up the boiler for service. Which parts require particularly close attention when opened up and describe the procedure for the setting of safety valves.

Q6. Sketch and describe a pneumatically operated control valve Explain how the valve is operated if the controller fails. Discuss the routine maintenance required for these valves.

Q2. A. Discuss the possible reasons for the following changes in boiler water test results, and state what actions should be taken in each case: 1. Reduction in total dissolved solids and chemical reserves 2. Reduction in phosphate reserve, with increase in chlorides and total dissolved solids. 3. Reduction in alkalinity levels only. B. State why the complete results of boiler tests are logged or entered into a data retrieval system rather than a note being made of any particular result which may be outside set limits.

Q8. Sketch and describe a turbocharger-bearing lubrication system. State the type of bearing employed and explain the advantages and disadvantages of the lubricating system described.

Q6. Give a reasoned opinion as to the accuracy of the following assertions:

a) Absence of oil grooves in the liner wall between the oil supply points results in increased wear of liner and rings.

b) ‘Timed lubrication’ has little merit,

c) The most suitable position of the oil supply point is immediately below the bottom piston ring with the piston at the top dead centre.

Q2. When ship is in dry dock, as a Second Engineer, describe inspections you would make prior to the start of work, during the work and after completion of the work of the following:

(a) Large sea water inlet chest and valves;

(b) Forward end of ship;

(c) Propeller and stern bush;

1. Q5. a) With reference to a vapour compression refrigeration plant, explain why each of the following conditions are desirable;

(i) Superheating at the compressor suction

(ii) Undercooling at the condenser outlet

(b) Describe, with the air of a pressure-enthalpy diagram, how the evaporator cooling load is affected by the conditions stated in Q5 (a)

Q9. Give reasons why each of the following conditions can result in oil being carried over with the water discharge from lubricating oil centrifuges:

a) High throughput of mixture, (6)

b) Abnormally high temperature of mixture, (6)

c) Appreciable accumulation of solids in bowl. (4)