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Q9. With reference to main refrigeration plant give a reason for each of the following operational irregularities and state how it is dealt with: A. Rapid loss of crankcase lubricating oil in a “vee” block machine; B. Gradual “fall off” in the refrigeration effect over a comparative short period of time; C. Icing up at compressor suction; D. Frequent cutting off of compressor on high pressure.