Q7. With reference to Keyless Propeller:
A. Sketch a section through a keyless sleeved propeller.
B. State the advantages of using a keyless sleeved propeller
C. State with reason, Which metal sleeve should be made for contact with the forged mild steel tail shaft?
D. State the material uses to bond the sleeve to the propeller and the general thickness of the bonding material.
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? (4)
(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? (6)
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
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