Heat Transfer
Water always boils when its

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

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
Nusselt number is the ratio of the

Heat flux at the wall to that across the entire pipe
Temperature gradient of the wall to that across the entire pipe
None of these
Temperature difference to the temperature gradient at the wall

ANSWER DOWNLOAD EXAMIANS APP