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Q9. With reference to main refrigeration plants 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)