Hfc - Study guides, Class notes & Summaries

What is one of the differences between tree-and-branch and hybrid fiber/coax (HFC) DESIGNS? - Bandwidth in the downstream path. In the tree-and-branch design, the cable signal in the downstream path leaves the trunk at the bridge amplifier. There, It makes a transition to the feeder's domain, and the signal splits. What is the maximum number of output ports the split signal can be routed to? - Four. Which of the following statements accurately describes the relationship between coaxial cab...

HFC-152a is ___ - Correct Answer flammable What are the 2 types of HFC-152a systems? - Correct Answer Direct expansion and secondary loop type Direct Expansion - Correct Answer Refrigerant directly expands within the evaporator that is located inside the passenger compartment Secondary Loop (Open Loop) - Correct Answer A circulating non-flammable fluid replaces the evaporator which provides isolation between the flammable refrigerant and the passenger compartment Section 609 of the C...

Ozone depletion is caused by _______ in HFC refrigerants. - Answer-chlorine CFCs and HCFCs ________ making them capable capable of reaching the stratospheric ozone layer. - Answer-do not dissolve in water or easily break down in the atmosphere According to the Rolanda-Molina theory, ________ are destroyed by each chlorine atom in the stratosphere. - Answer-100,000 ozone molecules The stratospheric ozone layer protects us from _______. - Answer-ultraviolet radiation from the sun Which...

When two or more refrigerants are mixed, what must be done with the mixture? Send off-site to EPA certified reclaimer for reclamation or destruction Which SAE Standard(s) must be referred to on the label of approved HFC-134a refrigerant recycling machines? SAE J2210 or SAE J2788 When it has been determined that an A/C system has a low refrigerant charge, what should be done? Perform a leak test procedure Which item is not mentioned in the SAE J1991 standard of refrigerant purity? ...

What are three principle characteristics that define an AC waveform? - Answer- The three principle characteristics that define an AC waveform are: (1) frequency; (2) wavelength; and (3) amplitude. What is one of the basic principles of resistance reflected in the familiar practices of grounding and bonding? - Answer- Grounding and bonding practices reflect the basic principle that electricity always follows the path of least resistance. What comprises the impedance of a coaxial cable or a ...

What should you do when replacing hoses? Make sure you have the correct type/size of tubing What does GWP stand for? Global Warming Potential CO2 is equal to what A/C system? R-744 HFO-1234yf systems are acceptable in what kinds of vehicles? Passenger cars, light-duty trucks, medium-duty passenger vehicles, heavy-duty pickup trucks, and complete heavy-duty vans HFO-1234yf systems are not acceptable in what kinds of vehicles? Heavy-duty trucks, refrigerated transport, and of...

In the tree-and-branch architecture, how is the downstream signal from the trunk fed to the distribution branches? Within each trunk amplifier, a portion of the downstream is fed to a bridger amplifier to boost the signal before being split and routed to the distribution branches. What is a common solution when congestion from modem activity and traffic becomes unacceptable in a hybrid fiber/coax (HFC) network? Node splitting, the subdividing of serving areas into two or more smaller servin...

EPA 608 UNIVERSAL EXAM WITH 400 REAL EXAM QUESTIONS AND 100% CORRECT ANSWERS (GUARANTEED A)/ EPA 608 UNIVERSAL EXAM (NEW!!) Equipment covered by EPA regulations include: - all air-conditioning and refrigeration equipment using CFC, HCFC or HFC refrigerants. All devices used for a refrigerant recovery must: - Meet EPA standards Reusable refrigerant containers that are normally under any pressure above 15 pig must be hydrostatically tested and date stamped every: - 5 Years The EPA can ...

© 2020 Pearson Education, Hoboken, NJ. All rights reserved. Solution Manual for Computer Networking, 8th Edition by James Kurose © 2020 Pearson Education, Hoboken, NJ. All rights reserved. Computer Networking: A Top-Down Approach, 8 th Edition Solutions to Review Questions and Problems Version Date: August 2020 This document contains the solutions to review questions and problems for the 8th edition of Computer Networking: A Top-Down Approach by Jim Kurose and Keith Ross. These s...

As of what date did it become unlawful to release Class 1 and Class II refrigerants to the atmosphere?Answer - July 1, 1992. What is the ozone layer and why is it important to us on Earth?Answer - Protective shield for Earth from the sun's harmful ultraviolent (UV) rays in the stratosphere layer that extends about 6 to 30 miles above earth. The atom found in CFC and HCFC refrigerants that destroys ozone in the stratosphere is?Answer - Chlorine. What is an ozone molecule made of?Answ...