DieselShip's Online Content Library

Q1. (A) Explain how wear on bearing surfaces is effected by each of the following factors:

(i) Dissimilarity of materials in the contact surfaces

(ii) Relative speed of sliding between the surfaces

(iii) Roughness of the surfaces

(iv) incompatibility of lubricant and bearing material.

(b) Describe how each effect may be identified during inspection, Suggest corrective action at either operational or maintenance stages.

Q2. With respect to the survey of diesel main propulsion machinery by Classification Society:

(a) Explain the term Continuous Survey of Machinery (CSM).

(b) Explain how Class has reduced the need for attendance by the surveyor for some work.

(c) Describe how a planned maintenance scheme may be used to advantage with CSM.

(d) Describe TWO programs that are approved by the Class in order that physical opening up machinery is not necessary on every occasion.

Q3. Explain vapor compression refrigeration cycle on T-S and PH diagram and explain the purpose of EACH of the following:

(a) Expansion valve

(b) Room thermostat

(c) High pressure cut out.

(d) Equalizing line.

Q4. Exhaust gas cleaning system is one of the system used on board ship to reduce SOX emissions-

(a) Briefly discuss various types of Exhaust gas cleaning system used on board ship.

(b) What all data to be monitored and recorded when EGCS is in use to ensure that system meets all IMO regulations.

(c) What action you will take as second engineer if the system stopped working.

Q5. With reference to static oily water separators, explain each of the following;

(a) Why the supply pump should be carefully selected and matched to the separator.

(b) How the separator achieves effective separation?

(C) How the physical properties of each of the fluids to be separated affects the rate and effectiveness of separation?

Q6. Describe, with the aid of a graph, each of the following types of ferrous material failure, stating one practical example of each and how these material failures can be prevented during manufacturing and during operation

(a) Creep

(b) Fatigue

(c) Fracture

Q9: With reference to sleeved keyless propeller assemblies: A. (i) State, with reasons, the metals used in the manufacture of the sleeve and tail end shaft; (ii)State the type and thickness of material used to bond the sleeve to the propeller boss. B. When removing the propeller from the tail end shaft, state why the following procedures are not recommended: (i) Application of push off force by means of wedges or jacks and draw off force by strong back; (ii) Expansion of propeller boss by concentrated local heating with gas torches. C.  State the correct procedure for the removal of the propeller from tail end shaft

Q8. Explain the causes of the formation of mil scale on steel plate.

(b) Describe the preparation necessary before the application of conventional paints to the underwater surface of the hull.

(c) Describe a coating scheme for the underwater hull using conventional paints.

Q9. With reference to ships air conditioning plants:

(a) state the temperatures and relative humidity at EACH of the points that are regarded as the boundaries of the comfort zone;

(b) explain how the temperatures and relative humidity could be maintained within the comfort zone when the ship is in EACH of the following locations:

(i) North West Europe in winter;

(ii) Arabian Gulf in summer.

(c) State with reasons FOUR locations within the accommodation that conditioned air must not be recirculated.