DieselShip's Online Content Library

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)

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)

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)

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)

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)