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Q2. Sketch and show all parts of two-stroke engine’s Stuffing box. Describe the procedure of  in place (Without removing piston) overhauling two stroke engine’s Stuffing box. Your answer should include all safety precautions taken and proper tools used during overhaul of Stuffing box.

Q1. Explain why auxiliary engine bottom-end bolts are prone to failure, even under normal running conditions. Identify those features, incorporated into the design of bottom-end bolts, to inhibit failure. Explain how this tendency is either aggravated or inhibited during maintenance and what checks are to be carried out.

Q9. (a) Describe how it is determined whether a crankshaft was twisted during a major “smash up” in a main engine.

(b) Explain where twisting is most likely to occur.

(c) Specify with reasons the degree of twisting that might be accommodated without correction

(d) Explain briefly what adjustments and precautions should be instituted when putting an engine with a twisted crankshaft back into service.

Q4. Under Continuous Survey of Machinery, the crosshead bearing of a large slow speed engine is due for survey.

a) Explain the procedure involved in the inspection of a cross-head bearing. (6)

b) List the precaution to be taken. (4)

c) Indicate the reasons for possible defects which could be encountered and state how they may be rectified. (3)

d) What test are carried out on completion of survey and reassembly. (3)

Q1.Describe how a jerk type of fuel pump is replaced, making specific reference to initial setting and governor connections. Explain how the actual and effective strokes are adjusted. Identify the common faults of these pumps. State how engine performance is affected by each of these faults and why prompt attention is necessary.

Q6. Following a recent turbocharger (T/C) overhaul, it has been observed that the scavenge air pressure is lower than before, and the engine power output has also been reduced.

a) State the possible causes of the problem with reasons. (5)

b) State the engine operational information that should be gathered to detect the possible causes of the problem, along with reasons for each type of information. (5)

c) State the instructions which should be issued with respect to future T/C overhauls in order to prevent similar incidents. (6)

Q7. a) Compare the working principles and applications of the turbine used in cargo oil pumps with the turbine in a turbocharger on board a ship. How do the design and operational requirements differ between these two types of turbines? (8)

b) What methods are employed to vary the speed of a cargo oil turbine on board a ship, and how do these methods ensure precise control of cargo operations? (4)

c) What is the role of a vacuum condenser in the cargo system of an oil tanker, and how does it contribute to the efficiency and safety of cargo operations? (4)

Q8. Explain the thermodynamic cycle involved in the air conditioning system on board a ship, detailing the key components and their functions. Additionally, describe the unloading and loading mechanisms used in the system to maintain efficiency and manage varying cooling loads. (16)

Q9. a) What is the working principle of a plate type cooler on a ship, and what are its main components? How does it differ from other types of heat exchangers used on ships? (6)

b) What materials are commonly used for the packing in plate type coolers on board ships, and how do these materials impact the efficiency and durability of the cooler? (5)

c) Describe the process of back flushing a plate type cooler on a ship. Why is back flushing important, and what potential issues can it prevent or mitigate. (5)