Rac 40 - Study guides, Class notes & Summaries

RAC 40 Quiz 4 Review with Complete Solutions (Graded A+) Which of the following statements is correct when referring to large refrigerant or nitrogen tanks? - Answer- Large tanks should not be carried, they should be secured to an approved cart. The protective cap must be on when the tank is not in use. Safety goggles or glasses must be worn when moving the tank. A double insulated drill _____. - Answer- Generally has a plastic case with the electrical connections and motor insulated withi...

RAC 40 Quiz 3 review with complete solutions

RAC 40 Quiz 2 Review | Latest Version | 2024/2025 | Rated A+ What is specific gravity? Specific gravity is the ratio of the density of a substance to the density of a reference substance (usually water for liquids). What does Boyle's Law state about pressure and volume in a gas? Boyle's Law states that the pressure of a gas is inversely proportional to its volume when temperature is constant. What does Charles's Law state about temperature and volume in a gas? Charles's L...

RAC 40 Quiz 1 Review Questions and Answers All Correct Heating the vapor temperature above the boiling point is called. - Answer- Super heating Heat that changes the temperature of a substance is called - Answer- Sensible heat What is the difference between a mercury barometer and an aneroid barometer? - Answer- Mercury barometer is bigger and not portable like an aneroid barometer. Mercury barometer contains mercury and an aneroid barometer uses a bellows. Define conduction of heat. ...

RAC 40 Quiz 3 Review - Questions and Answers 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 sub...

RAC 40 Quiz 7 Review - Questions and Answers When soldering, flux should be applied to ________. The male part of the joint only The size indicated for the diameter of copper tubing used for plumbing is the approximate __________. Inside dimension When joining steel pipe, ___________ should be applied to the threads before connecting. Pipe dope The maximum temp. at which soft solder is done is __________. 842 F If a technician needs 5/8" ACR for an installation and was located near only a plu...

RAC 40 Quiz 5 Review - Questions and Answers The tool used to create pipe threads on the outside of a pipe is called a_________ Die A(n) ___________ Is used to measure the amount of CO2 in flue products 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. Inspection mirror The dial type meter used to measure the pressure in heating unit flue pipe is called a(n) Draft gauge When required to drill ...

RAC 40 Quiz 6 Review - Questions and Answers 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? 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 True A wall anchor is a onetime fastener False A pin rivet must be installed in a properly sized, pre-drilled hole. True Perforat...

RAC 40 Quiz 8 Review - Questions and Answers After repairing a System that has had an electrical motor failure (compressor burnout) it is good field practice to re-use the recovered refrigerant in that system False Air entering a refrigerant system can eventually lead to compressor failure True The maximum recommended pressure for leak testing is 150 PSIG on the low pressure side of the system True While under a deep vacuum any liquid water under the oil in the motor compressor assembly can be...