Most commercial hog producers use a _____ system.
Fill in the blank(s) with the appropriate word(s).
crossbreeding
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Air is located in a piston-cylinder device. Initially, the air is 20oC and the pressure is 200 kPa, while the volume is 0.1 m3.
(a) The air is heated at constant pressure until the volume is 0.3 m3. Determine the heat transfer for the process. (b) For the same initial conditions, use your piston-cylinder device model to generate data, and plot the heat transferred for an isobaric expansion to volumes ranging from 0.15 m3 to 0.50 m3. Given: Air; T1 = 20oC = 293 K; P1 = P2 = P = 200 kPa; V1 = 0.1 m3; V2 = 0.3 m3 Assume: Air behaves as an ideal gas with variable specific heats (expect a large temperature change): R = 0.287 kJ/kg-K; ?KE = ?PE = 0.
A ____________________ with flight recorder functions may be useful during a test drive.
Fill in the blank(s) with the appropriate word(s).
What is the advantage of balanced-port TEVs?
A) Balanced port valves can be converted from externally equalized valves to internally equalized simply by capping the equalizer port. B) Balanced port valves equalize on the off cycle, making it easier for the compressor to start. C) Balanced port valves can be installed upside down. D) Balanced port valves can retain good control over a wider range of operating conditions.
Why should an inside sump be included in the cooling tower piping?
A) It allows the tower to be supersaturated when needed. B) It increases tower efficiency by lowering the wet-bulb temperature. C) It shuts down the tower fan when it is not needed. D) It provides a cooling tower bypass in freezing weather.