DieselShip's Online Content Library

Q1. Describe the procedure for:

(a) Rivetting two plates. (6)

(b) Removing a rivet from the plates. (4)

(c) Tools required. (4)

Q1. Explain the difficulty faced in lubrication of crosshead bearings and how this is overcome by the engine makers of two stroke low speed main propulsion engines type with suitable sketches. (16)

Q7. (a) Why is heat treatment necessary for carbon steel? (6)

(b) Describe the various heat treatment processes and their benefits. (10)

Q2. (a) Describe equipment used in gas cutting operation.

(b) What is combination cutting torch. (4)

(c) Describe how Acetylene gas is kept stored in cylinders. (4)

(d) What precautions are taken with Acetylene & Oxygen Cylinders, while in storage and in working condition. (4)

Q6. (a) Describe the constructional features of plate type freshwater generator and its operational procedures for fresh water generation. (6)

(b) State the temperatures and pressures at salient points. (4)

(c) State some of the advantages and limitations that exist in using a plate type heat exchanger. (6)

Q3. (a) Sketch a water-tight door and frame showing manner of attachment to bulkhead and the additional reinforcement carried by the bulkhead to compensate for the aperture. (8)

(b) Explain how water-tightness of the door and frame mating surface is ensured with an hydrostatic pressure tending to force the faces apart. (4)

(c) Describe the means of remote closing operation of the door and state how many closing stations there are and their position. (4)

Q4. With reference to auxiliary engine fuel pumps

a) Explain how a fuel pump may be checked for accuracy of injection timing. (6)

b) Describe how fuel pump may be adjusted after overhaul. (5)

c) Explain the circumstances in which it is considered necessary to replace a fuel pump. (5)

Q3. (a) Describe required properties of cutting tools. (8)

(b) Describe materials used for making cutting tools. (8)

Q3. Some of the common problems found in Auxiliary diesel generator engines can be due to,

(i) Power Imbalance. (4)

(ii) Degradation of Lubricating Oil. (4)

(iii) Exhaust gas high temperature. (4)

(iv) Unusual Knocking Sound. (4)

State how to identify these problems during engine operations, and the action steps that you shall take as a watch keeper.

Q2. a) With reference to crankshafts and piston crowns outline the main stresses to which these parts are subjected. (4)

b) In each case explain how the stresses are generated and how they very in magnitude and direction during one cycle. (6)

c) With respect to the whole engine, describe how stresses may be accommodated by good design and influenced by poor maintenance. (6)

Q4. (a) Describe uses of compressed air onboard the ship. (6)

(b) Describe maintenance schedule of various systems on main air compressor. (6)

(c) Describe Isolation procedure of main air compressor before starting any work (4)

Q4. Sketch and describe the operation of a governor suitable for a diesel generator.

Q3. With regards to the metacentric height, which of the following statements is true? (16)

(a) It is used to indicate the quality of initial stability.

(b) It is located below the center of buoyancy.

(c) It is measured vertically above the center of buoyancy.

(d) Its determination is the objective of the inclining experiment. Briefly justify your answer.

Q4. Explain the procedures to be followed before, during and after taking bunker and transferring of the bunker; (8)

(i) State the checklists to be adopted before, during and after bunkering. (4)

(ii) Make a schematic showing the storage and fuel transfer lines on board. (4)

Q5. (a) Describe why priming is required for centrifugal pumps, with diagrammatic sketch describe working of primer for centrifugal pump. (10)

(b) Why balance holes are provided in the impeller? (6)

Q5. (a) Sketch and describe a device employed for continuous monitoring of the viscosity of heavy fuel oil being supplied to a main engine (8)

(b) Explain how the system employing the device described in (a) operates to adjust the fuel viscosity. (8)

Q5. Describe the functional components of a reefer plant for the domestic refrigeration. system and temperatures to be maintained in different cold rooms; (8)

i) Describe the pressure switches; (2)

(ii) The tubular heat exchanger; (2)

(iii) The Oil separator and, (2)

(iv) The drier system. (2)

Q6. i) Sketch and describe a biological sewage treatment system. (6)

ii) How does the biological Sewage Treatment Plant work? Explain. (6)

iii) What is understood by the term BOD? What factors affect BOD. (4)

Q3. Work is being carried out in drydock on a large sea water inlet chest and the valves. Describe the inspection you would carry out:

(a) As the work starts (8)

(b) During and after the work. (8)

Q6. Explain how leakage of the undermentioned valves may become apparent to watchkeepers and state the effects on engine operation. Describe the immediate and subsequent action Which might be necessary in each case.
(a) Exhaust valve
(b) Fuel valve
(c) Air Starting valve

Q7. (i) What is an 'eductor'? State it's function. (4)

(ii) Explain the working principle of an eductor, explain in slight detail. (6)

(iii) Draw an eductor and name it's parts. Show how it is connected to a tank ‘stripping’ arrangement. (6)

Q7.a) Describe how A. E, crankshaft deflections are measured. (6)

b) State how the measurements can be checked for accuracy. (5)

c) Specify with reasons other checks that should be made on the crankshaft. (5)

Q4. With reference to lubricating oil:

(a) Explain why oil employed in the crankcase of a trunk piston engine differs in its properties from that employed in the crankcase of a crosshead engine. (6)

(b) List FOUR effects of bacterial attack on crankcase oil.

(c) Explain the action which must be taken if bacterial attack of the crankcase oil is detected. (4)

Q8. Describe the procedure for the regular maintenance routines to be carried out on the various types of portable fire extinguisher on ships. (16)

Q1. (a) Describe the procedure for taking crankshaft deflection of Auxiliary Engine, explaining all precautions that must be observed (8)

(b) Explain what deflection readings actually mean and suggest the action which must be taken should readings be outside values recommended by the engine manufacturer. (8)

Q7. a) What are the Safety Devices fitted to an Air Compressor? (4)

b) What is the purpose of the Scum Valve on a Boiler? (4)

c) What is the function of an evaporator in a Refrigeration System? (4)

d) Regarding the Emergency Bilge Injection Valve, what is its relevant size compared to the Main Sea Water Injection Valve? (4)

Q9. With reference to exhaust valves of an auxiliary diesel engine.

(a) Describe how valves are reconditioned (8)

(b) Explain how valve timing is checked and corrected. (8)

Q5.a) State why double walled fuel pipes are employed for high pressure fuel lines. (6)

b) Sketch and describe such a double walled pipe arrangement and show how high-pressure pipe failure is indicated. (10)

Q5. With regard to keeping the gas side of boilers in good condition,

Discuss EACH of the following.

1. The mechanism of combustion, stating the factors which are important to good combustion (6)

2. Oil fuel treatment (5)

3. Soot removal equipment (5)