Rac 40 - Study guides, Class notes & Summaries

RAC 40 Quiz 6 Review Practice Test 2024. When connecting stranded wire under a screw terminal (like a thermostat) what process should be used to ensure a secure and solid connection is obtained? - CORRECT ANSWER Solder the end of the wire so all copper strands are binded together and no loose wires will fall out Nails are sometimes coated with zinc to protect them from corrosion - CORRECT ANSWER True A wall anchor is a one time fastener - CORRECT ANSWER False A pin rivet must be in...

RAC 40 Quiz 7 Review Study Guide 2024. When soldering, flux should be applied to ________. - CORRECT ANSWER C. The male part of the joint only The size indicated for the diameter of copper tubing used for plumbing is the approximate __________. - CORRECT ANSWER C. Inside dimension When joining steel pipe, ___________ should be applied to the threads before connecting. - CORRECT ANSWER A. Pipe dope The maximum temp. at which soft solder is done is __________. - CORRECT ANSWER D. 842...

RAC 40 QUIZ 5 Review Complete Test 2024. The tool used to create pipe threads on the outside of a pipe is called a_________ - CORRECT ANSWER Die A(n) ___________ Is used to measure the amount of CO2 in flue products - CORRECT ANSWER CO2/O2 Indicator After brazing a joint in a very tight location, the technician would use a(n) __________ to determine if the joint is properly brazed. - CORRECT ANSWER Inspection mirror The dial type meter used to measure the pressure in heating unit f...

RAC 40 Quiz 2 Review - Questions and Answers Boyle's law P1 x V1 = P2 x V2 Dalton's law Ptotal = Psubstance 1 + Psubstance 2 Charles' law V1 / T1 = V2 / T2 Specific Volume ft3/lb Hp 33000 ft-lb/min Specific Gravity no units Density lb/ft3 1kW 3413 Btu Work= Force x Distance One watt of electrical energy is equal to 3.413 Btu The volume of gas varies inversely with the absolute pressure, provided the temperature remains constant. This is called ______ ___. Boyle's Law A solid material exert...

RAC 40 Quiz 4 Review Questions | Latest Version | 2024/2025 | 100% Verified What is the main property of a refrigerant that allows it to change from liquid to gas? The main property is its low boiling point, which allows it to evaporate and absorb heat at low temperatures. What is a common environmental concern associated with certain refrigerants? Certain refrigerants contribute to ozone depletion and global warming. What is the difference between a CFC and an HFC refrigerant? ...

RAC 40 Quiz 4 Review - Questions and Answers When transferring refrigerants from a cylinder to a refrigeration system or any other container you should always wear ______. Goggles with side shields and gloves A fusible plug is a metal fitting that has a hole drilled through it and the hole is filled with ______. Material with a low melting point When it is necessary to perform electrical work in an area that has a damp or wet floor, which of the following can be done to minimize the chance of e...

The _____ compressor is another positive displacement compressor and is used for larger air conditioning and refrigeration applications. - Screw Compressor The four (4) major components of a vapor compression refrigeration system are the compressor, condenser, evaporator, and ________ ______. - Metering device The amount of heat a refrigerant contains with -40F as the 0 heat content reference point is called - Enthalpy From a performance standpoint, a substitute for R-12 is - R-134A Th...

RAC 40 Quiz 1 Review - Questions and Answers In ______ heat or hidden heat, heat is known to be added, but no temperature is noticed. Latent PSIA at sea level under standard conditions is 14.696 The two common temperature scales used by air conditioning and refrigeration technicians are called. Fahrenheit and Celsius The Fahrenheit absolute scale is called the Rankin scale Atmospheric pressure in inches of mercury (" Hg) decreases _____ per 1000 feet 1 Inch A gauge that reads 0 psi when opene...

RAC 40 Quiz 3 Homework Assignment 2024.The _____ compressor is another positive displacement compressor and is used for larger air conditioning and refrigeration applications. - CORRECT ANSWER Screw Compressor The four (4) major components of a vapor compression refrigeration system are the compressor, condenser, evaporator, and ________ ______. - CORRECT ANSWER Metering device The amount of heat a refrigerant contains with -40F as the 0 heat content reference point is called - CORRECT ANS...