Q3. Clean and dry control air is essential for efficient trouble-free operation of a ship’s pneumatic’ control air system.
a) Sketch and describe a low-pressure control air system used on board ships showing various arrangements to deal with dust oil and moisture as well as safety system. (8)
b) Explain using a line diagram, arrangements provided, to reduce the air pressure to 7/8 bars. Required for control air system. (8)
Q9.a) Explain why air receivers should be drained frequently and its internal surfaces to be provided with protective coatings (6)
b) Describe the procedure for internal inspection of air receivers and the possible defects that may be encountered. Suggest suitable repair methods for the defects. (6)
c) Describe fault conditions associated with air receiver mountings and the remedies to rectify the same. (4)
Q6. i) Explain the term ‘Volumetric efficiency’ in respect of air compressors. (3)
ii) State reasons for drop in ‘Volumetric efficiency’ and how same can be restored? (7)
iii) Explain the purpose of ‘unloader’. Name the methods used for unloading, for ‘starting’ and ‘stopping’ when on automatic operation. (6)
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