Q3. Why Engineering Materials are tested prior manufacturing of their components.
i) Describe the various destructive and non-destructive tests carried out on materials for shipboard used. (6)
ii) Explain the purpose of each test and where the same applied. (10)
Q2. (a) Name the different types of lubricating principles used in the lubrication of ships machinery (10)
(b) Give examples in each case, stating the names of machinery/ components/ system where same applied (6)
Q3. (a) Explain the role of hatch covers in dry cargo vessels and mention the types of mechanically operated hatch covers (5)
(b) Sketch and describe the operation of hatch cover of single pull type Macgregor design, front rolling type (7)
(c) How is the 'watertightness’ ensured for same? Explain the function of 'cleats'. (4)
Q5. (a) Explain the use of boiler mountings. State as to why they are provided. (6)
(b) Name all mountings provided on water tube boilers individually and explain their purposes. (10)
Q6. (a) Explain the basis for deciding the capacity of main air reservoir on a motor ship for propulsion system. State appropriate rules (6)
(b) Sketch and describe a main air reservoir. Name the mountings provided/fitted and their use. What safety features are provided/fitted (10)
Q8. (a) Explain 'short cycling' in the context of refrigeration and air conditioning systems onboard ship. State its causes and how it can be avoided. (6) (b) State the symptoms of 'overcharging' and 'undercharging' in refrigeration system. What are its effects and state remedial measures (5) (c) What are the visible indicators of oil in refrigeration system. What would be its effects? State remedial measures (5)
Q8. (a) State the purpose of 'freshwater' and 'salinity water' hydrophore systems on ship (4)
(b) Explain through a line diagram, the functional components and other fittings of 'fresh water' hydrophore system. Also show as to how the calorifier is attached to this system. (8)
(c) Explain as to how is the hydrophore system is charged? Give procedure (4)
Q9. (i) For a centrifugal pump, draw its performance characteristics and clearly explain the same (6)
(ii) Draw a curve showing efficiency versus flow rate of centrifugal pump (n vs Q) (6)
(iii) What interference can be drawn from these curves (4)
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