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In which method a refrigeration plant of required capacity is needed to be installed near the site of work?

(a) Pumping

(b) Well Point System

(c) Freezing process

(d) Electro osmosis process

I got this question in an interview for internship.

I'd like to ask this question from Deep Excavations topic in section Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

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Right option is (c) Freezing process

Best explanation: The principle of ground freezing process is the use of refrigeration to convert in-situ pore water to Ice. Hence, refrigeration plant of required capacity is installed near the site of work to perform the process of refrigeration.

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