Heat Transfer
Heat exchangers operating, when the asymptotic range is reached,

Results in making part of the heating surface inactive
Results in abruptly increased velocity
None of these
Provide very large heat transfer co-efficient

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Heat Transfer
Water always boils when its

Saturated vapour pressure is less than the atmospheric pressure
Vapour pressure equals 76 cm of Hg
Temperature reaches 100° C
Saturated vapour pressure equals the external pressure on its surface

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