DieselShip's Online Content Library

Q1.a) With the aid of a block diagram describe the operation of an electronic governor fitted to an auxiliary diesel engine. (8)

b) Engine fitted with an electronic governor may behaves erratically during load changes. Explain the possible causes. (8)

--- PREVIOUSLY ASKED ---

Q9. A. With the aid of a block diagram describe the operation of an electronic governor fitted to an auxiliary diesel engine. B. An engine fitted with an electronic governor during load changes. Explain the possible causes.

Q2. (a) State, with reasons, the properties required a cylinder lubricant for a main engine operating on HFO. (8)

(b) Describe, with the aid of a sketches, an electronically controlled cylinder lubrication system, stating how the timing and quantity of cylinder lubricant is regulated and set. (8)

---Previously Asked As---

Q3. State, with reasons, THREE properties required for a cylinder lubricant for a main engine operating on HFO.

(b) Describe, with the aid of a sketches, an electronically controlled cylinder lubrication system, stating how the timing and quantity of cylinder lubricant is regulated and set.

Q3. (a) Define the term Torsional Vibration with respect to an engine crankshaft, stating the effect that high levels can have on an engine crankshaft. (6)

(b) Explain how engine deterioration influences the risk of Torsional Vibration, stating what can be done to minimise that risk. (5)

(c) Explain TWO possible reasons for the activation of a Torsional Vibration alarm after an engine has been started if there had been no previous history of such an alarm and if no maintenance had been undertaken on the engine whilst it was stopped. (5)

Q4. With reference to LNG diesel engine installations:

(a) Describe, with the aid of a sketch, a Gas Valve Unit, explaining its purpose and indicating where it is located in the gas train. (6)

(b) Explain why ventilation and inert gas systems must be installed with the engine fuel gas system. (5)

(c) State why pilot injection must be provided when burning fuel gas, explaining how a pilot injection system works (5)

Q5. a) Identify the factor, which could be responsible for initiation and propagation of explosions in air starting systems. (4)

b) Explain how the possibility of an explosion in an air start system is minimized. (4)

c) Describe the devices required for air start systems, which are intended to dissipate the energy of an explosion. (4)

d) Suggest why one type of safety addition, although appearing to operate correctly, may not prevent a server air start line explosion and loss of life. (4)

Q6. Give a list of the properties or test by which distillate and blended fuels may be specified or decisions be made on their fitness for use. Name the properties or constituents that may be found in a blended fuel having a high viscosity and high carbon content. Explain how they may cause problems in engine operation. (16)

Q8. A. Briefly describe the causes and effects of bacterial attack of lubricating oil. (8)

B. Bacterial activity has been detected in the lubricating oil of the main engine fitted in the ship aboard which you are serving as 2ndeng. Write a letter to the owner/operator of the ship indicating the action you intent to take and offer suggestion to the avoidance of future incidents. (8)

Q9. (a) Why is the axial clearance of a main thrust bearing an important dimension? (5)

(b) How is this clearance measured? (5)

(c) Describe how the thrust pads are removed for inspection and state what you would look for in particular. (6)