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______________ tells how much heat passes through 1 m2 of the partition per 1°C of differential temperature.

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______________ tells how much heat passes through 1 m2 of the partition per 1°C of differential temperature.

(a) Friction coefficient

(b) Temperature coefficient

(c) Overall heat transfer coefficient

(d) Time coefficient

This question was addressed to me during a job interview.

My question comes from Heat Exchangers in chapter Building Blocks of Dairy Processing of Dairy Engineering

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Correct option is (c) Overall heat transfer coefficient

For explanation I would say: The overall heat transfer coefficient refers to how well heat is conducted over a series of mediums. This factor, k, is a measure of how efficient the heat transfer is.

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