Using the psychrometric chart, calculate the following:
1. The absolute humidity of air that has RH=40% and a dry bulb temperature 60oC.
2. The wet bulb temperature under these conditions.
3. The RH of air having a wet bulb temperature 44oC and a dry bulb
Temperature 70oC.
4. The dew point of air cooled adiabatically from RH 30% and a dry bulb
Temperature 50oC.
5. The change in RH of air with a wet bulb temperature 38oC, heated from 50oC to
86oC (dry bulb temperatures).

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?