NATE Final Exam #1 Questions and answers 2023/24 Liberty University
1 view 0 purchase
Course
NATE 2023
Institution
NATE 2023
NATE Final Exam #1 Questions and answers 2023/24 Liberty University NATE Final Exam #1 Questions and answers 2023/24 Liberty University NATE Final Exam #1 Questions and answers 2023/24 Liberty University NATE Final Exam #1 Questions and answers 2023/24 Liberty University
D: Refrigerant toxicity and flammability - correct answer D: Refrigerant toxicity and
flammability
ANSI/ASHRAE 34 published in 2001 and entitled "Designation and Safety Classification
of Refrigerants".
• Class A signifies refrigerants for which toxicity has not been identified at
concentrations less than or equal to 400 ppm;
• Class B signifies refrigerants for which there is evidence of toxicity at concentrations
below 400 ppm.
• Class 1 indicates refrigerants that do not show flame propagation when tested in air at
21°C and 101 kPa;
• Class 2 indicates refrigerants having a lower flammability limit of more than 0.10 kg/m3
at 21°C and 101 kPa and a heat of combustion of less than 19 kJ/kg;
• Class 3 indicates refrigerants that are highly flammable as defined by a lower
flammability limit of less than or equal to 0.10 kg/m3 at 21°C and 101 kPa or a heat of
combustion greater than or equal to 19 kJ/kg.
What control would you use on a capillary tube or automatic expansion valve system to
maintain the desired temperature?
A: Dual pressure control
B: High pressure control
C: Thermostatic temperature control
D: Low pressure control - correct answer C: Thermostatic temperature control
The total heat contained in any substance is obtained by adding together its:
A: Radiant and specific heat
B: Latent and sensible heat
C: Radiant and sensible heat
The 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 VEVA2K. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
