If the flow rate drops by 50% in a hydronic system due to the pump slowing down, how will the pressure drop and power required change?
A) Pressure drop will be 50%; power will be 25%,
B) Pressure drop will be 25%; power will be 12.5%.
C) Pressure drop will be 50%; power will be 50%.
B) Pressure drop will be 25%; power will be 12.5%.
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Write a system of equations that would allow you to calculate the mole fractions of W and Z in the two equilibrium liquid phases at 300 K. You don’t have to solve the equations, but the number of equations and unknowns should be equal, such that they could be solved. You may assume the numerical values of any adjustable parameters are known at 300 K, even if you were unable to answer part B.
This problem concerns mixtures of two liquids, W and Z. Some data for pure W and pure Z is given in the table below. No data on mixtures of these compounds is available, but based on their molecular structures, use of the ideal solution model is considered unrealistic. You are going to use a thermodynamic model to predict whether this pair of compounds will form stable liquid mixtures, or whether there will be a miscibility gap, at atmospheric pressure and various temperatures.
The ratio of block to feet in length of a wall is ______ .
A. 0.75 to 1.00 B. 0.66 to 1.00 C. 0.5 to 1.0 D. 1 to 1
A circuit in which there is only one path for current flow is known as:
A. parallel circuit B. series circuit C. energized circuit D. series-parallel circuit
____ series bar joists are the strongest bar joists.
A. H B. I C. J D. K