Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Shell and tube heat exchanger with air inside tubes and steam on shell side
Shell and tube heat exchanger with air on shell side and steam inside tubes
Finned tube heat exchanger with air inside and steam outside
Finned tube heat exchanger with air outside and steam inside

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

Total heat transfer area of all the effects is -less than that in a single effect evaporator system
Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system
Boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system
Total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect

ANSWER DOWNLOAD EXAMIANS APP