Hvac Study guides, Class notes & Summaries

Furnace - ANSWER The air flow on most structures that use a fossil fuel for a heat source have a___that would be used as an air supply. Control loop - ANSWER Almost all control systems use a___to control the temperature with in a given structure, space, or zone. Troubleshooting - ANSWER A___chart is a graphical representation of a troubleshooting procedure for a particular unit. Overload - ANSWER A___is an electrical device that protects a load from a high ampere draw by breaking a set ...

HVAC CERTIFICATION EXAM 2024 WITH 100% ACCURATE SOLUTIONS Propane and Butane are _______ than air: - correct answer Heavier What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A - correct answer 6 ohms Temperature at which oil starts to produce a waxy substance that may interfere with the refrigeration system - correct answer Floc point What manifold gauge set is used to charge, evacuate, add oil and recover refrigeran...

HVAC CONTRACTOR EXAM 2024 WITH 100% ACCURATE SOLUTIONS An instrument that measures potential differences between 2 points in an electrical circuit is called? A. potentiometer B. thermistor C. ohmeter D. voltmeter - correct answer voltmeter This device uses a thermal sensing bulb at the outlet of the evaporator to sense temperature and control superheat A. automatic expansion valve B. thermostatic expansion valve C. low side float D. schraeder valve - correct answer thermostat...

HVAC EXAM 1 2024 WITH 100% CORRECT ANSWERS Matter exists in what three forms? - correct answer solid, liquid, gas What is temperature measured by? Quantity or intensity - correct answer Intensity Define British thermal unit (Btu) - correct answer Measure of heat energy - amount of energy needed to raise 1 lb of water 1 degree F How much heat is required to raise the temp of 100 lb or water from 70F to 120F - correct answer Q=1000lb*(1btu / change of temp) so 1000*(1/ 50) = 50,000 ...

HVAC EXAM 2024 WITH 100% ACCURATE SOLUTIONS Two locations where a cold air return should be installed - correct answer open area of a wall and low to the ground Which of the following is the law of thermodynamics? - correct answer heat moves toward a place with lower intensity Sensible heat describes - correct answer how hot something feels Latent heat is measured in - correct answer british thermal units What is the amount of heat energy required to evaporate 1 pound of water? ...

HVAC EXAM 2024 WITH 100% ACCURATE ANSWERS What are the 4 modes for heat transfer and example? - correct answer 1) radiation: radiator 2) conduction: heated floor, pot on stove 3) convection: forced air system 4) evaporation: AC running at house and come in from the beach sweating (idk what that means ) What are different types of heating systems? - correct answer (radiant) pros: easy to zone, min distribution loss, lack of convected heat loss cons: no duct work (need for AC syst...

HVAC FINAL EXAM 2024 WITH 100% ACCURATE SOLUTIONS What is an HVAC System? - correct answer all the items needed to maintain thermal comfort within a space or group of spaces What are the four components of an HVAC system? - correct answer Fans Pumps Compressor Evaporator What is a PTAC? - correct answer Packaged Terminal Air Conditioner What is a PTHP? - correct answer Packaged Terminal Heat Pump List the heat transfer equipment (3) - correct answer Boiler Chiller Coil W...

HVAC FINAL EXAM 2024 WITH 100% ACCURATE SOLUTIONS The four leading causes of death in the construction industry include electrical incidents,caught in or caught-between incidents, and___ - correct answer Falls A sign that has a white background with a green panel with white lettering is a: - correct answer Safety instruction sign To properly dispose of oily rags, they must be - correct answer stored in a container designed for the purpose Keeping your work area clean and free of sc...

HVAC TEST EXAM 2024 WITH 100% ACCURATE SOLUTIONS You are the refrigeration engineer running a 2000 - ton centrifugal refrigeration system. The system supplies chilled water to a college campus with multiple buildings. You have normal chilled water load about 1800 tons when the refrigeration system suddenly stops and shuts down. The panel display on the refrigeration system indicates that the problem is with the water flow. of the following, which immediate action would be best? - correct answ...

HVAC EXAM 2024 WITH 100% ACCURATE SOLUTIONS Why is IAQ important? a) to provide a comfortable environment for occupants b) to provide enough oxygen for occupants c) to provide the right temperature for a productive environment for occupants d) to provide sufficient airflow for occupants e) to provide a healthy environment for occupants - correct answer e) to provide a healthy environment for occupants What is not considered a contaminate? a) Carbon Dioxide b) Ozone c) Carbon Mon...

HVAC Test with Complete Solutions (1) Second hand smoke - Answer-ETS Drain pan - Answer-"A" Coil Orfice - Answer-TXV capillary 98.6 - Answer-body temperature Wet-bulb depression - Answer-Wet-bulb and dry-bulb called 8'F - Answer-Elf the drywall temperature is 76 fahrenheit in a wet bulb temperature is 68 Fahrenheit with depression is 100% - Answer-When a dry rub and wet bulb temperature are the same they related to human of the air is Enthalpy - Answer-Of air is the meas...