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410A CET EXAM WITH QUESTIONS AND ANSWERS
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410A CET EXAM WITH QUESTIONS AND ANSWERS Ozone depletion is caused by__________. - ANSWER Chlorine R-410A is _________________. - ANSWER A binary near-azeotropic mix ture The Federal Clean Air Act calls for the phase-out of HCFC-22 by___________. - ANSWER The Montreal Protocol The SEER indicates the_____________. - ANSWER Seasonal Energy Efficiency Ratio TEWI takes into consideration_______effects of global warming. - ANS WER all the direct and indirect A compressor designed for use with R-22________. - ANSWER should never be used with R-410A A compression ratio of 5:1 indicates that________. - ANSWER the absolu te discharge pressure is 5 times the absolute suction pressure Liquid lines used with R-22_________. - ANSWER may be used with R-4 10A if sized and properly cleaned Evaporating pressure is also known as_____________. - ANSWER back p ressure, suction pressure and/or low-side pressure Condensing pressure is also known as____________. - ANSWER discharge pressure Whenever possible, to avoid fractionation, charging of a refrigeration system incorporating a near-azeotropic blend should be done with__________ ___. - ANSWER A liquid refrigerant For commercial and industrial refrigeration systems, a ______annual leak rat e is considered a substantial leak. - ANSWER 35% A pressure/temperature chart that shows a dew point and bubble point is for_______. - ANSWER a near-azeotropic blend. The temerature glide for R-410A at a typical air conditioning and refrigeration temperature is_______________. - ANSWER less than .03 degrees F Most refrigerant blends are___________. - ANSWER either binary or ternary The function of refrigeration oil is to___________. - ANSWER minimize wear, transfer heat, and seal and prevent blow- by Polyolester lubricants (POEs) are used extensively with______. - ANSWER H FCs Oils are categorized into these two groups,_________. - ANSWER synth etic and natural Polyolester (POE) oils stored in plastic containers will______ . - ANSWER absorb moisture through the plastic Polalkylene Glycol (PAG) oils__________. - ANSWER are extremely hygroscopic. Refrigerants exposed to high temperature may_________. - ANSWER decompose, fractionate, and create corrosive elements To lockout electrical equipment, turn off electrical power, lock it in the off position, then place a lockout tab at the power distribution panel. What do yo u do with the lock key? - ANSWER Keep it on you until you are ready to turn the power back on. The MSDS contains_________. - ANSWER safety data ASHRAE Standard 15 requires that each refrigeration system be equipped with_________. - ANSWER a pressure relief valve. The discharge pressure of R-410A can be______higher than R-22. - ANSWERThe benefits of buying summaries with Stuvia:
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