Hvac r - Study guides, Class notes & Summaries

HVAC: EPA 608 Certification Study Guide Questions and Answers | Latest Version | 2024/2025 | Rated A+ Are there alternative refrigerants that can be directly used in systems originally designed for R- 12? Why or why not? No, because these new refrigerants are not compatible with the lubricants and oils used in R- 12 systems. Explanation: The oils and lubricants in R-12 systems cannot properly interact with newer refrigerants, making direct replacements unfeasible. What type of o...

HVAC Electrical Midterm Exam Questions and Answers All Correct are the particles that orbit the core of an atom - Answer-electrons is the force that pushes free electrons through conductors - Answer-voltage name 3 terms meaning voltage - Answer-electromotive force (emf) potential difference and eletrical pressure a device used to generate electricity is called a - Answer-voltage source name 6 voltage sources - Answer-battery, generator, solar cell, thermocouple, alternator, tran...

BOMA – HVAC QUESTIONS AND ANSWERS 100% PASS Two basic categories of chillers are the compression cycle and absorption The five requirements for comfort are proper temperature, humidity, filtration, and ventilation circulation The primary function of an expansion device is to produce a reduction in the pressure on the liquid refrigerant, regulate the flow of refrigerant into the evaporator, lower the boiling point of the refrigerant far enough below the temperature of the load to g...

Created to serve as a complete, comprehensive code regulating the construction of single-family, two-family and buildings consisting of three or more townhouse units. - Answer IRC (International Residential Code) Administrative - Answer First 2 chapters of code book are True - Answer Plans or supporting documents are almost always required by the controlling authority prior to issuing a permit. T or F Yes - Answer Does the building official have the authority to render interpretations o...

Heat which causes a change in temperature of a substance is called; : Sensible Heat. heat added to substance without a rise in temperature; (example: liquid refrigerant to gas) this process is called? : Latent heat of vaporization. Heat added to the refrigerant in a vapor state after the evaporation process is called; : Superheat. A scroll compressor move refrigerant by means of; : Involute Spirals. The movement of heat by way of fluid (or air) is called; : Convection. The movement o...

Resistance is? - Opposition to current flow An electron has? - A negative charge Impedance is? - Opposition to alternating current flow Current flow is? - Electron flow in a circuit The safety ground conductor is usually color coded? - Green or bare. Like charges? - Repel each other The symbol for current is? - I Any material that will readily release electrons is called? - A conductor Which of the following materials would be best suited for use a...

Heat which causes a change in temperature of a substance is called; - ans-Sensible Heat. heat added to substance without a rise in temperature; (example: liquid refrigerant to gas) this process is called? - ans-Latent heat of vaporization. Heat added to the refrigerant in a vapor state after the evaporation process is called; - ans-Superheat. A scroll compressor move refrigerant by means of; - ans-Involute Spirals. The movement of heat by way of fluid (or air) is call...

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Resistance is? - ANSWEROpposition to current flow An electron has? - ANSWERA negative charge Impedance is? - ANSWEROpposition to alternating current flow Current flow is? - ANSWERElectron flow in a circuit The safety ground conductor is usually color coded? - ANSWERGreen or bare. Like charges? - ANSWERRepel each other The symbol for current is? - ANSWERI Any material that will readily release electrons is called? - ANSWERA conductor Which of the following materials would ...

The high and low pressures in a refrigerant system are separated by the : - Answer-COMPRESSOR & METERING DEVICE. The pressure at which the refrigerant changes state from a vapor to a liquid is the : - AnswerCONDENSING PRESSURE. A pressure gauge placed anywhere from the metering device to the compressor will read: - AnswerTHE LOW SIDE OR EVAPORATING PRESSURE. The most common refrigerants exist either in : - Answer-BOTH (A&B) A. SATUARATED VAPOR & B.SATURATED LIQUID STATE. In a operating sys...

HVAC NATE Heat Pump Exam 2024 Correctly Answered! On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that does not exceed what? - ANSWER 6-7PSI or 6F