DieselShip's Online Content Library

Q1. With reference to scavenge fires:

(a) State FOUR possible contributing factors. (4)

(b) Explain how EACH factor mentioned in (a) contributes. (8)

(c) State FOUR indications. (4)

Q4. (a) Describe how the thrust of the propeller is transmitted to the hull of the ship. (4)

(b) Describe, with the aid of a sketch, how the surfaces, within the thrust block, transmitting the thrust are separated by the lubricating oil. (8)

(c) Explain the importance of the oil temperature within the thrust block (4)

Q3. (a) Answer the following:

(i) State why the simultaneous injection of fuel oil and starting air into a main engine cylinder is undesirable. (2)

(ii) Explain how simultaneous injection of fuel oil and starting air is prevented. (4)

(b) Answer the following:

(i) Explain how a leaking air start valve is detected while the engine is running. (4)

(ii) Describe the actions to be taken upon discovery of a leaking air start valve. (6)

Q3. (a) Draw a line diagram of a main lubricating oil system for a large two-stroke cross-head type diesel engine. Label all the principle components of the system. (16)

Q3. Describe the procedure to change the fuel supply system of the main propulsion engine from high viscosity fuel to low viscosity fuel such as diesel oil whilst on passage. (16)

Q1. With reference to shutting down a main propulsion diesel engine plant, after a voyage, explain EACH of the following:

(a) The conditions to be met for transferring from Bridge control to Engine Room Control just prior to shut down (8)

(b) FOUR precautions to be taken after shutdown, in order to ready the main engine for maintenance (8)

Q4. With reference to main diesel engine starting air lines:

(a) Describe the main cause of a starting air line explosion. (8)

(b) Explain how a leaking start air valve can be identified while the engine is running. (4)

(c) State four different safety devices which can be incorporated into the starting air line to limit the damage caused by an explosion. (4)

Q1. With reference to the operation of main propulsion engines, outline the importance of EACH of the following:

(a) Maintaining the temperature of the scavenge air above the dewpoint (4)

(b) Maintaining the fuel at the correct viscosity for injection (4)

(c) Regular on board testing of the lubricating oil (4)

(d) Ensuring rotation of exhaust valves (4)

Q1. Describe the procedure for preparing a main engine, from cold, for sea service (16)

Q2. (a) Describe how modern diesel engines are pressure charged. (8)

(b) State TWO reasons for cooling the charge air before it enters the engine. (8)

Q1. (a) Explain why an engine may fail to start on air when the start air receiver is fully charged and the air receiver outlet to the engine is open.(10)

b) Describe how problems with air start systems may be avoided. (6)

Q3. With reference to Jacket Cooling Water treatment of a diesel engine:

(a) State the chemical tests caried out (6)

(b) State the frequency of testing (2)

(c) Explain why it is necessary to keep the test results within certain limits (4)

(d) State the action to be taken to rectify an abnormal test result (4)