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)
Q7. State the causes and remedial actions to be taken in case of the following detected on a reciprocating air compressor:
(a) Water mixed in the crankcase oil (4)
(b) LP safety valve blowing (4)
(c) Bursting disc rupture (4)
(d) Defective piston rings (4)
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