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High condenser pressure in a refrigerator system can occur due to which of the following reasons?

            1. Cooling tower is inefficient or the water flow rate is less than the designed value

            2. Non – condensable gases are present in the system

            3. Accumulation of lubrication oil in the condenser

            4. Low charge of refrigerant in the system

            Select the correct answer from the codes given below

            (a) 2 only         (b) 1 or 2 or 3 (c) 1 or 2 or 4              (d) 2 or 3 or 4

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