Q6. a) How is 2- stroke engine started? Describe the sequence of engine starting step. (5)
b) Draw the Timing diagram of engine starting, showing crank position of each. (6)
c) What is OVERLAP in engine starting (5)
Q1. i) Define the term 'vibrations’ and through examples, explain 'periodic' and oscillatory motions. (4)
ii) Name the type of vibration and how they are classified. (4)
iii) Machineries on board operate with their own natural vibrations which generally indicate their health. Explain the term 'abnormal vibration ' and the sources from where they originate. (8)
Q2. a) Draw sectional diagram of main engine piston showing each part. (8)
b) Show cooling passages for oil cooled piston. (4)
c) What is material of crown and other parts of piston. (4)
Q2. What is mean by 'corrosion control'? List out the techniques used in effecting corrosion control and render brief explanation of same. Give one example each of their application. (16)
Q3. a) What is crank web deflection and purpose of measuring the same? (4)
b) How crank web deflections are taken, describe the process. (6)
c) Describe the process to locate faulty main bearing by taking crank web deflection measurement. (6)
Q3. Make a comprehensive list of fuel oil, diesel oil & lubricating oil tanks on board; stating the purpose of each tank & their location. What was their approximate capacity on your last ship. (16)
Q3.a) What is the function of charge air cooler on 2-stroke Diesel Engine? (4)
b) Draw Diagrammatic sketch of charge air cooler. Describe each part. (8)
c) How the efficiency of charge air cooler can be checked? (4)
Q4. i) what are the type of contaminants which affect lubricating oils? Briefly explain each of them. (6)
ii) what measures are adopted to prevent their entry into machinery lubricating oils systems. (4)
iii) How contaminated oils are dealt with on ships? Particularly in the case of bacterial attack. (6)
Q5.a) Draw diagrammatic sketch of Boiler gauge glass. Name each part and function. (8)
b) What safeties are provided on gauge glass in case of rupturing of the glass? (4)
c) Describe procedure for blow down of gauge glass. (4)
Q5. i) Why are deck cranes provided? Name the different parts of deck cranes and what is the advantage of carrying deck cranes? (6)
ii) Name the safety stops and 'cutouts' provided for safe operation. (4)
iii) What maintenance is required periodically? (3)
iv) What is rocking test and why same carried out? (3)
Q6. For 2-Stroke Main Engine of your ship, how are the following obtained?
a) Power Card, showing vital point of diagram. (4)
b) Out of phase diagram indicating vital points. (4)
c) Light spring diagram, indicating vital points. (4)
d) Compression diagram and its importance. (4)
Q6. i) what are the types of pumps normally used for steering gear system? (3)
ii) Using a simple sketch explain the working principle of 'radial piston' type pumps. (8)
iii) What is understood by the term 'hunting action'? (5)
Q7. a) What are the various methods used for reversing the motion of ship. (4)
b) With respect to reversing of main engine running direction. Explain following.
i) Lost Motion. (4)
ii) Axial shifting of cams. (4)
iii) Roller Displacement. (4)
Q7. i) Sketch and describe a composite boiler and explain its working principle. (12)
ii) What do you understand by the term 'Heat Recovery'? Briefly explain as to how it contributes to increasing plant efficiency? (4)
Q4. a) By drawing a block diagram describe how on a large 2-stroke marine diesel engine, fuel quantity and timing is controlled? (8)
b) What are disadvantages of VIT system? (4)
c) What actions are required in case of VIT system failure? (4)
Q8. i) Explain the basic theory of air compressors using a basic P-V cycle diagram, for a single stage air compressor, showing (a) adiabatic (b) polytropic (c) isothermal lines of compression. (6)
ii) Explain the advantages of multistage compression and intercooling. Superimpose the effects of both on the P-V diagram mentioned above. (6)
iii) Briefly explain bumping clearance. (4)
Q9.a) Describe procedure of changeover of high Sulphur fuel from high seas to 0.1% Sulphur in ECA zone. (8)
b) How time for change over is determined such that vessel enters ECA zone with 0.1% of Sulphur? (4)
c) What entries are made in Engine room logbook pertaining to low Sulphur oil change over? (4)
Q9. i) In a refrigeration and air-conditioning system, what are the different methods for detecting gas leakage? (3)
ii) Name different types of detectors available and state how they are used to identify point of leakage. What safeties are observed when performing 'leak detection'. (4)
iii) Explain how leakages in the piping system are rectified (a) temporarily (b) permanently? (5)
iv) What records are to be created and maintained whilst carrying out repair / maintenance on the refrigeration system? (4)
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