Q5. i) What is the stern tube bearing and why it is provided? (4)
ii) Name the bearing material used & how same lubricated & cooled? (3)
iii) For 'oil lubricated' stern tubes,
how oil is prevented from flowing out? Explain sealing arrangement with line sketch & material used. (6)
iv) Name the type of oil used for lubrication. (3)
Q1. (a) What is a right-handed and a left-handed propeller? (5)
(b) With the aid of simple sketches explain Rake, Skew and Pitch of the propeller. (6)
(c) What are the advantages and disadvantages of CPP? (5)
Q1. Describe with the aid of sketches how each of the following contribute towards improving the propulsive efficiency of a ship: (16)
(a) Ducted propeller
(b) Costa bulb as fitted to rudder
(c) Grim wheel vane as fitted aft of the propeller
Q4. With reference to sleeved keyless propellers:
(a) State with reasons why the following practise are not advisable when removing the propeller from its shaft. (8)
i) Expansion of boss by intense concentrated heating by blow torch.
ii) The use of wedge or jacks.
(b) Describe a system that is used to remove the propeller from its shaft. (8)
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