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)
Q8. i) Explain the basic theory of air compressors using a basic P-V cycle diagram, for a single stage air compressor, showing (a) adiabatic (b) polytropic (c) isothermal lines of compression. (6)
ii) Explain the advantages of multistage compression and intercooling. Superimpose the effects of both on the P-V diagram mentioned above. (6)
iii) Briefly explain bumping clearance. (4)
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