Why do thermostatic expansion valves on heat pump coils use maximum operating pressure bulb charges?
A) Because the sensing bulb is subjected to high temperatures when the coil is functioning as an evaporator
B) Because the sensing bulb is subjected to low temperatures when the coil is functioning as an evaporator
C) Because the sensing bulb is subjected to high temperatures when the coil is functioning as a condenser
D) Because the sensing bulb is subjected to low temperatures when the coil is functioning as a condenser
C
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This problem concerns a compound for which the following information is available:
• The triple point is located at P=0.8 atm and T=300 K. • The critical point is located at P=40 atm and T=650 K. • The acentric factor is 0.25. • At atmospheric pressure, it boils at 314 K. • At atmospheric pressure, the molar volume is 0.12 L/mol for solid and 0.132 L/mol for liquid. • At atmospheric pressure, the enthalpy of fusion/melting is 400 J/mol. Give your best estimate of each of the following: A) The enthalpy of vaporization at the triple point. B) The vapor pressure at 305 K. C) The vapor pressure at 500 K. D) Estimate the melting point at atmospheric pressure.
When rigging a load, the center of gravity must be _____.
a. at least six inches above the hook b. at least one inch above the hook c. even with the hook d. below the hook
A unitized vehicle body may have which of these special features:
A. It provides a steel box around the passenger compartment B. Special steel panels are inserted in the doors to protect occupants in a side collision C. A steel cradle is mounted under the front of the unitized body to support the engine and transaxle D. All of the above
The State Highway Department is considering a bypass loop that is expected to save motorists $820,000 per year in gasoline and other automobile-related expenses. However, local businesses will experience revenue losses estimated to be $135,000 each year. The cost of the loop will be $9,000,000. (a) Calculate the conventional B/C ratio using an interest rate of 6% per year and a 20-year project period. (b) Calculate the conventional B/C ratio without considering the disbenefits. Is the project economically justified with and without considering the revenue losses? (c) Develop the single-cell spreadsheet functions that will answer the two questions above.
What will be an ideal response?