DieselShip's Online Content Library

Q1. Considering effect of corrosion, describe choice of material for following with reasons.

(a) Sea Water pump body. (4)

(b) Sea Water Pump Impeller. (4)

(c) Sea Water Pump Shaft. (4)

(d) Filter boxes (4)

Q2. (a) Describe Hydraulic Jack for large nut tightening used onboard; Draw diagrammatic Sketch of the jack describing each part. (8)

(b) Describe procedure for tightening and unscrewing the nut with Hydraulic Jacks. (8)

Q3. (a) What type of Destructive testing methods are in use? Describe the methods in brief. (8)

(b) Describe advantages of destructive testing. (4)

(c) Describe disadvantages of Destructive Testing. (4)

Q4. Describe following metal finishing processes and objectives:

a) Honing (4)

b) Lapping (4)

c) Polishing (4)

d) Buffing (4)

Q5. (a) Describe with a diagram the sea water cooling system of your ship. Name each part and its function. (12)

(b) Describe defects associated with Sea water Cooling system of your ship. (4)

Q6. (a) Sketch and describe the operation of the domestic refrigeration system of a ship using freon 22 gas as refrigerant. (8)

(b) Describe the causes for the following in the domestic refrigeration system. (8)

(i) Frequent cut-in and cut-out of the compressor

(ii) Compressor running hot

(iii) High pressure cut out of the compressor

(iv) Frosting in the compressor suction side.

Q7. Write short notes on the following:

(i) Low output of a fresh water generator (4)

(ii) Fuel oil purifier overflowing (4)

(iii) Alarming rise in engine room bilge level at sea (4)

(iv) Frequent shearing of pump-motor coupling pad (4)

Q8. Where a waste heat boiler is subject to persistent leakage at the tube/tube plate connection, state with reasons:

(a) The possible causes of such leakage (6)

(b) The effects of this leakage (5)

(c) Methods of effecting a permanent repair. (5)

Q9. With reference to Main Engine Turbo charger

(a) What are the indication of water leakage in turbo charger casing. (8)

(b) Precaution to be taken during water washing at sea (8)