Question:-
Which one of the following is correct for the process 1-2 shown above ?

Option (A)
The partial pressure of water vapour in air remains constant
Option (B)
Specific humidity of air remains constant
Option(C)
Enthalpy of air remains constant
Option(D)
Dry bulb temperature of air remains constant
Correct Option:
(C)
Question Solution:
Since enthalpy lines are parallel or coinciding with constant wet bulb temperature lines. The line shown o the figure is along constant enthalpy.
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