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Q1. (a) Sketch a unit for automatic monitoring and regulation of the fuel viscosity.

(b) Describe fuel change over procedures that are followed for switching from distillate fuel to heavy residual oil and vice versa.

Q6. With reference to large two stroke engine:

(a) Explain how abnormal and excessive cylinder liner wear caused, state how it can be detected:

(b) Explain the effects and consequences of excessive cylinder liner wear

(c)  Explain how abnormal cylinder liner wear may be prevented.

Q2. A. Sketch and describe a control system for maneuvering a main diesel engine from the bridge

B.  Explain how local control may be effected in case of breakdown of the control system described in 2 (A).

Q4. Misalignment of the main shafting between engine and propeller causes bearing overloads and shaft stress;

A. State the difficulties associated with checking shaft alignment and the reasons why results are unreliable due to external factors;

B. Explain with a simple sketch how a bearing load is assessed.

C. Explain how uneven loading could be rectified

Q5. With reference to the crankshaft and running gear of an engine, explain static balance, Dynamic balance, Torque reaction couple, and Critical speed

Q2. A. Explain the term Variable Injection Timing (VIT) when applied to fuel pumps and state why a change in timing of fuel injection may be required.;

B. Describe, with the aid of sketches a VIT fuel pump and explain how the change in timing is achieved whilst the pump is in operation

C. Explain how it may be determined that individual fuel pumps are injecting the correct quantity of fuel with the correct timing at a particular pump setting.

Q8. (A) A set of indicator diagrams including draw cards has been taken for a main diesel engine, noted that compression curve is normal. Examine critically and give reasons for following observations.

i. The maximum pressure is lower;

ii. The maximum pressure is higher;

iii. The expansion curve is lower;

iv. The expansion curve is higher.

(B). Describe how the faults as mentioned above can be rectified

Q8. During the past 4 months since you have joined the ship as second engineer a number of main engine exhaust valves have suffered cracking and corrosion at the seating faces. Write a report to the superintendent covering the following points;

A. An explanation detailing how the problem became evident.

B. Your action upon recognising the extent and seriousness of the problem

C. Your reasoned views regarding the positive causes of the problem

D. Your recommendations to avoid future incidents.

Q9. With reference to turbochargers –

A. Explain how corrosion can occur on the gas side of a turbocharger casing;

B. Describe the process and safeguards necessary when water washing the air side;

C. Explain the possible disadvantage of water washing the gas side.