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)
Q5. (a) Name the safety devices fitted on 2 Stage air compressors on ships. Explain their functional purpose as well as location of fitment, using a schematic diagram. (12)
(b) State the maintenance and checks carried out periodically in order to keep them efficient. (4)
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