Exam (elaborations)
410A CET EXAM WITH QUESTIONS AND ANSWERS
- Course
- Institution
410A CET EXAM WITH QUESTIONS AND ANSWERS...
[Show more]
Seller
Follow
Content preview
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:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Humat. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81849 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now