Which of the following is true about presenting vapor-liquid equilibrium (VLE) data?
A. We typically denote the composition of the vapor phase with the variable “x” and the composition of the liquid phase with the variable “y”.
B. A Pxy data table is presented with a fixed pressure.
C. A Txy data table is presented with a fixed temperature.
D. The phase present above the curve on a Pxy plot is a single liquid phase.
E. None of the above are true
A. Incorrect. This is backwards. The “x” is usually the liquid and the “y” the vapor concentration.
B. Incorrect. The names of the Pxy and Txy tables indicate the variables that are changing, so a Pxy table has fixed temperature, variable pressure and mole fractions.
C. Incorrect. The names of the Pxy and Txy tables indicate the variables that are changing, so a Txy table has fixed pressure, variable temperature and mole fractions.
D. Correct. As pressure increases, condensation will occur and a single liquid phase will exist.
E. Incorrect. One statement is true.
You might also like to view...
What type of valve is a flow-regulating device that uses a disc-shaped flow-control element to increase or decrease flow?
A) Ball check valve B) Lift check valve C) Swing check valve D) Gate valve
____________________ occurs when the vehicle is prevented from moving while the engine is accelerated.
Fill in the blank(s) with the appropriate word(s).
Liquids are considered to be:
a. non-compressible b. compressible in low pressure operations c. compressible during high pressure operations <500 psig d. compressible in a PD compressor operation
As the outside air temperature drops, the heating efficiency of air-to-air heat pumps:
A) Is unpredictable. B) Decreases. C) Increases. D) Remains the same.