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. 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)

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. 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)

Q5. (a) Describe the sequence of events that may lead to a crankcase explosion. (6)

(b) Describe an oil mist detector, explaining how it operates. (8)

(C) Describe how an oil mist detector operation is checked for accuracy. (2)

Q4. (a) Sketch a camshaft timing chain arrangement indicating how the chain tension is adjusted. (12)

(b) State TWO items of ancillary equipment which can be driven via the timing chain. (4)

Q2. a. Describe, with the aid of a sketch, a main engine fuel oil circulating system incorporating the MGO and HFO service tanks, a fuel change over system, heating and viscosity control system and tank return system. (10)

b. Write instructions for changing the system described in part (a) of the question from MGO to HFO, indicating the checks to be made during the changeover. (6)