Q1. A. State, with reasons, FOUR possible causes of a propulsion engine failing to start when operating on bridge control; B. Explain how the causes stated in A. may be determined; C. Explain the procedure for changing over to local control in the event of failure of the remote-control system of a marine diesel propulsion engine. D. State the procedure involved in achieving manual reversal of a marine diesel engine.
With respect to control air supply system for Main Engine Control:
A. Define the essential conditions, which must be satisfied by the air supply for a pneumatic control system;
B. Sketch a control air supply arrangement and give a reasoned explanation for positioning of dryers and filters.
Q5. Give a list of the properties or tests 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
Q5. Discuss the consequences of failure to maintain correct clearances in the case of main diesel engine crankshaft and bottom end bearings. Sketch a bottom end bearing paying particular attention to the arrangement of ensuring uninterrupted flow of oil to the top end bearing.
Q5. With reference to recent ratification of MARPOL 73/78 Annex VI, ships with be required to burn low sulphur (4.5%) fuel oil. Discuss the properties of cylinder liner lubricant for compatibility with this type of fuel and the on-board management of operating the engines with two different types of fuel for main engine.
Q7. With reference to fouling on the gas side of turbochargers, state - A. What are the common causes and nature of the deposits? B. How it effects engine operation? C. how it is reduced in practice? D. How heavy fouling can be avoided?
Q1. A. Describe with the aid of a sketch, the arrangement of exhaust and air inlet passages in a medium speed four stroke engine cylinder head. B. With reference to [a] indicate where cracking might be expected stating the likely cause. C. Explain the different factors that tend to cause distortion of 4stroke cylinder head. D. Explain how the effects described in [c] are minimized.
Q1. With reference to torsional vibrations in a main propulsion installation based on medium speed engines, gearbox and controllable pitch propeller: Explain how the vibrations may be caused; State the possible effects and damage that could result; Discuss the methods employed to minimise the potential problems associate with torsional vibration; Describe how the natural vibration frequency of the system could be modified.
Q3. As second engineer you have been requested to obtain a set of indicator card from the large slow speed engine of a recently purchased second hand ship.
A. Describe your initial checks and preparations;
B. State with reason the types of card you would consider necessary and explain the procedure for obtaining these;
C. State in order of importance the additional information required with the card;
D. State your procedure for analysis of the cards and obtaining cylinder powers.
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