Answer the following statement(s) true (T) or false (F)
A. It is very important to accurately model the pure-component vapor pressures
B. The mixture fugacity coefficient of component i in the liquid phase must be equal to the mixture fugacity coefficient of component i in the vapor phase.
C. Generally, the Peng-Robinson equation of state is more accurate in predicting mixture phase behavior than the van der Waals equation of state.
D. The binary interaction parameter is 0 when the cross-parameter for the parameter a (a12) is simply the geometric mean of the pure-component parameters.
E. None of the above are false.
A. Incorrect. This is true. An EOS that cannot model the pure component vapor pressures accurately will not provide an accurate model for the mixture.
B. Correct. It is the fugacity that must be the same at equilibrium, not the fugacity coefficient. If you employ the fugacity coefficient for the phase equilibrium of mixtures, it must be multiplied by the composition of that phase.
C. Incorrect. This is true. The Peng-Robinson equation of state, with an additional parameter (acentric factor) and a temperature-dependent “a” parameter relative to the van der Waals equation of state, is more accurate.
D. Incorrect. This is true. You can see this by inspection of Equation 12.60.
E. Incorrect. One statement is false.
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Fill in the blank(s) with the appropriate word(s).
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Answer the following statement true (T) or false (F)
The nameplate on a motor indicates that the motor has an FLC of 15A and a service factor (SF) of 1.15. How much additional current can this motor safely handle for intermittent power demands?
A) 1.15A B) 3.25A C) 2.25A D) 1.75A