DieselShip's Online Content Library

Q1. (a) Sketch a block diagram showing a bridge control system for propeller pitch, engine speed and load. (8)

(b) Describe the operation of the system sketched in (a). (4)

(c) What are the requirements to be fulfilled on an UMS classed vessel for operating "unmanned Engine Room watch." (4)

Q2. During your watch, main engine operation suddenly becomes erratic with speed varying widely even though fuel control remains at the value originally set:

a) State with reasons the possible cause of this behavior (8)

(b) Explain in detail how this cause can be traced, and the problems rectified. (8)

Q3. (a) State why jacketed fuel pipes are employed for protection of high-pressure fuel delivery lines between the high-pressure fuel pumps and fuel injectors. (4)

(b) Sketch and describe such a jacketed pipe arrangement and show how high-pressure pipe failure is indicated. (12)

Q4. Describe the effects upon the auxiliary engine of running with the following defects.
(a) Incorrect tappet (4)

(b) Carbon encrusted injector nozzle (4)

(c) Fouled turbocharger (4)

(d) Worn out fuel pump cams Indicate how the defect may be detected and the rectifying action required in each case. (4)

Q5. Sketch and describe a cylinder liner used for a 2-stroke main engine with cross flow scavenging. Show the provision made for sealing cooling water and exhaust gases. (16)

Q6. (a) Sketch and describe a fuel oil system of a large diesel engine, from settling tanks to main engine fuel injectors. (10)

(b) Also, comment on the importance of,

(i) Heating arrangement with temperature control (2)

(ii) Prevention of air lock in the system (2)

(iii) Purification of fuel (2)

Q7. What is specific fuel consumption of a diesel engine? Why is it necessary to specify it and how will you check this for the large diesel engine of your vessel. (16)

Q8. With reference to the construction of a turbocharger, sketch and describe

a) The rotor bearing and it's method of lubrication. (6)

b) Labyrinth seal and explain how such a seal work. (6)

c) Impeller and diffuser. (4)

Q9. Sketch and describe the operation of a crankcase oil mist detector. What operational maintenance does this instrument require for efficient performance. (16)