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)
Q6. Explain why each of the following features is considered desirable for air compressors:
(a) A single-throw crank for a multi-stage compressor; (4)
(b) Minimum clearance volume· (4)
(c) Multi tubular inter-stage cooler; (4)
(d) Generous size of suction filter. (4)
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