Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Graetz number > 100
Exit fluid temperature = wall temperature
Exit fluid temperature < wall temperature
Exit-fluid temperature > wall temperature

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Heat Transfer
Water always boils when its

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

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Heat Transfer
Steam trap is used to

Stop the supply of steam
Remove water resulting from partial condensation of steam
None of these
Condense the steam flowing in the pipeline

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