DieselShip's Online Content Library

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)

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)

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)

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)

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)

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)

Q2. (a) Explain the meaning of the term Supercharging and state how it is achieved. (8)

(b) State how would you ascertain that EACH of the following components had become fouled:

(i) Charge air intercooler (4)

(ii) Air intake suction filters. (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)

Q1. (a) In the case of a main engine and Controllable Pitch Propeller not responding to bridge control, describe the routine for changing to and using Engine Room control. (8)

(b) Explain how control of fuel pump delivery is achieved when emergency manoeuvring on engine side control of a large 2 stroke crosshead engine. (8)

Q7. A. Describe how crosshead bearing and guide clearances can be checked. (6)

b. Describe, with the aid of a sketch, the procedure for checking the condition of a crosshead engine bottom end bearing surface. (10)