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)
Q4. Sketch and describe an Independent two-stage air compressor. Draw a set of typical Indicator diagrams and insert the various pressures and temperatures. Indicate the effect of a leaking H.P. suction valve and excessive H.P. clearance volume. (16)
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