DieselShip's Online Content Library

Q1. a) Describe how crosshead bearing and guide clearances can be checked. (6)

b) Describe, With the aid of a sketch the procedure for checking the condition of a crosshead engine bottom end bearing (10)

Q2. What are the causes of corrosion in boilers? What precautions would you take to prevent

corrosion (a) when boiler is steaming? (b) when boiler is idle? How would you test the boiler

water for acidity and alkalinity? (16)

Q8. a) Describe the inspection, which is required to be carried out in the dry-dock after the stern of a ship has heavily struck a dock wall. (8)

b) The propeller is found to be damaged, and it is decided to fit the spare propeller. Describe the process and mention the precautions to be taken to ensure correct assembly. (8)

Q4. A. With the aid of a block diagram state the usual check points for maintenance of an electronic governor fitted to an auxiliary diesel engine. (8)

B. As engine fitted with an electronic governor behaves erratically during load changes. Explain the possible causes. (8)

Q5. Inspection of an engine Indicates an unexpected increase in cylinder liner wear rate. State with reasons the possible causes and remedial measures if.

(i) The problem is confined to a single cylinder (8)

(ii) The problem is common to all cylinders. (8)

Q6. a) Sketch a line diagram of a high-pressure cutout of the type fitted in a refrigeration system. (8)
b) (i) Describe the operation of the high-pressure cutout sketched in (a). (8)

(ii) State TWO faults that would cause excessive high-pressure and suggest remedy for EACH

fault (8)

Q8. If soon after joining a motor ship, you found a number of holding down bolts slack and fretting to have occurred in the area of slack bolts describe how you would handle the situation?

Q2. What is Metal-locking? What types of repairs are carried out by metal-locking? Describe the repair procedure using Metal-Locking.

Q9. Sketch suitable welded joints indicating approximate plate thickness and dimensions of preparation for the following purposes: -

a) End plate connection to shell of an unfired pressure vessel. (6)

b) Longitudinal seam of a high pressure compressed air bottle. (5)

c)Describe any faults in workmanship, which might weaken the finished products. (5)