DieselShip's Online Content Library

Q1. With regard to the main turbine lubrication oil system:

a) (i) Describe the effects of tin oxide corrosion; (5)

(ii) Explain the actions to be taken if this occurs in a high-pressure turbine thrust bearing. (5)

b) Discuss the factors that determine the various filtration sizes: (6)

Q4:  Comment on the reliability and maintenance requirements of two of the following;

(i) Pneumatic control equipment,

(ii) Electro-mechanical control equipment,

(iii) Electronic control equipment

(b) Discuss the routine attention required and the defects, which may occur in service.

Q3. Discuss the advantages and disadvantages of adopting the following policies for maintenance of main and auxiliary diesel engines.

A. Planned maintenance.

B. Condition monitoring.

C. Periodic replacement of components. (16)

Q4. a) What are the various types of corrosion that can occur in auxiliary boilers on ships? Describe each type, including its causes, symptoms, and potential consequences.

b) Discuss the preventive measures and maintenance practices that can be implemented to mitigate corrosion and ensure the efficiency of the auxiliary boiler.

Q5. a) How is the specific fuel oil consumption (SFOC) of a ship’s main engine calculated? Outline the steps involved in the calculation, including the necessary measurements and formulae.

b) Discuss the factors that can influence SFOC and how it impacts the overall efficiency and operational costs of the vessel.

Q6. Briefly discuss the working principles of the Hele Shaw pumps and swash plate pumps and how are they used in steering gear systems?

Q7. What is Rocking test of Deck Crane? Explain the procedure of rocking test. Tabulate and indicate fault finding procedure. What is the action taken if deviation is out of limit?

Q2. a) During an inspection it is noticed that tie rods of certain main engine units have become slack, state with reasons the possible causes of this.

b) Explain how correct tension is restored and the risk of future slackness minimized.

c) A tie rod has fractured and cannot be replaced immediately, State with reasons the course of action to be adopted in order to allow the engine to be operated without further damage.

Q9. a) What is the role of a thermostatic expansion valve in a refrigeration system on a ship? Sketch and describe its working principle.

b) Discuss the importance of proper adjustment and maintenance for efficient system operation and consequences of a malfunctioning thermostatic expansion valve on the refrigeration cycle.