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Q2. With reference to main refrigeration plant give reason for each of the following operational irregularities and state how these are dealt with:

a) Rapid loss of lubricating oil from the crankcase of a "vee" block compressor. (4)

b) steady "fall off" in refrigeration effect over a comparatively short period of time. (4)

c) Excessive "icing up" at compressor suction. (4)

d) Short cycling. (4)