R-1234yf is a preferred refrigerant over R-134a because:
A) is highly flammable
B) has a high GWP
C) depletes the ozone layer
D) has a low GWP
D) has a low GWP
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The majority of useful work done by steam in a power plant occurs _____.
a. on the steam side of the loop b. in the boiler c. between the turbine and the condenser d. between the boiler feedwater pump and the boiler
An engine with a reported lack of power (LOP) condition evidently caused by fuel starvation is being diagnosed. The specified maximum inlet restriction on the primary side of the fuel transfer pump is 7-inches HG and the circuit tests at exactly this value. Technician A says that the LOP condition is almost certainly caused by a plugged primary filter and the first step should be to change it. Technician B says that the primary side of the fuel subsystem is not responsible because it still tests within specification. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Do an Internet search and fi nd another drug, besides aspirin and penicillin, which has been isolated from an organism. Provide information on the organism, how it was discovered, and how it is used in the healthcare industry. Provide information how this chemical is used by the organism in nature. (Try searching with “natural medicinal chemicals” or “natural medical botanical products.”)
What will be an ideal response?
Use linear programming, a spreadsheet, and the Solver tool to select from the independent, unequal-life projects in Problem 12.18.
Problem 12.18
The independent project estimates below have been developed by the engineering and finance managers at Golphanen Enterprises. The corporate MARR is 8% per year, and the capital investment limit set by the CFO is $4 million. As a new employee in the Engineering Department, you have been asked to recommend the economically best projects. Use (a) hand solution, and (b) spreadsheet solution to determine your recommendation.
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