____ have increased system reliability through the reduction of circuits and improved efficiency by less power demands and more accurate control.
A. Diagnostic trouble codes
B. Live data streams
C. Multiplexing systems
D. By-directional controls
Answer: C
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What mixture concentricity of ethylene glycol to water provides maximum antifreeze protection?
A. 100 percent B. 60 percent C. 30 percent D. 20 percent
When charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid from entering the system?
A. Charge only as a vapor through the high side. B. Charge only liquid through the high side. C. Charge as a liquid through the low side using a restrictor. D. Charge as a vapor through the low side using a resistor.
Which farm program intervenes in the market the least:
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To prevent mineral buildup and scale on an ice machine:
A) Use an ultraviolet light. B) Test the pH of the incoming water. C) Clean regularly with a chlorine disinfectant. D) Use a water filter to remove suspended solids.