HVAC Refrigeration Fundamental Practice Test

These questions are part of the practice quiz. Start practicing

• Why is it important to know the physical and chemical properties of materials used in work?
• What is the definition of a fluid?
• Why does the compression refrigeration cycle have a high-pressure side?
• What can improve comfort levels during the heating season at lower temperatures?
• What three environmental conditions are most significant for comfort?
• Variable refrigerant flow systems primarily utilize what type of technology?
• Regarding the capacities of VRF outdoor units, what is generally true?
• Which type of refrigerant is considered most hazardous due to its flammability and toxicity?
• What is specific humidity?
• In general, which is denser?
• What is the primary function of the condenser in a refrigeration system?
• What is the Rankine temperature scale?
• What is the absolute temperature scale equivalent for Fahrenheit?
• What are common symptoms of carbon monoxide poisoning?
• What does the term "unitary" refer to in air conditioners?
• What does temperature measure in a substance?
• Which contaminants can be found in recovered refrigerant?
• Why is the flammability number important for refrigerants?
• What component enables the use of a single compressor to control multiple cases at different temperatures?
• Compared to older systems, how are the condenser coils in new higher-efficiency systems designed?
• In case of an accident, what is the first step to take?
• Which components are common to both the compression cycle and the absorption cycle?
• What designation do fluorinated refrigerants that start with a number 5 have?
• Which two refrigerant lines are found in a split system air conditioner?
• In the context of thermodynamics, what is a vacuum often used for?
• What is the mixed air temperature for a system with 20% outdoor air, an outdoor temperature of 90°F and a return air temperature of 80°F?
• What is a key benefit of using a VRF system over traditional systems?
• Which of the following is a critical factor for safety in HVACR jobs?
• How does the air's relative humidity impact comfort?
• What is a molecule?
• What is the purpose of a solution pump in an absorption refrigeration system?
• What is the most common unit for measuring pressure in HVAC systems?
• How do zeotropes differ from azeotropes in handling?
• How much heat is needed to increase the temperature of 20 lb of water from 32°F to 212°F?
• Which types of accidents should be reported?
• When does a refrigerant gain heat in the refrigeration cycle?
• How can the pressure of a saturated refrigerant be predicted?
• The wiring for a four-port multisplit system runs how many wires to each indoor unit?
• Refrigerant quantities in air-conditioning systems are commonly expressed in what units?
• Which type of thermometer is capable of measuring temperature from a distance?
• What is the order of the four main components of the refrigeration cycle?
• Which component in the refrigeration cycle is responsible for heat absorption?
• Which refrigerant is not considered an HFC?
• A system that maintains temperatures of -250°F and below is classified as which type of system?
• Why is it important to provide a clear invoice to customers?
• What do size, form, shape, and state describe in science?
• When is pressure measured without considering the current atmospheric pressure?
• When multiple compressors are installed in parallel, what must be ensured?
• In the United States, which of the following units is NOT used to measure liquid volume?
• If the barometric pressure reads 28 in Hg, what would that be in psia?
• Which of the following is included in the body's cooling mechanisms?
• Manufacturers recommend pressurizing VRF piping to what pressure for leak testing?
• What is the recommended distance for the base of an extension ladder from the wall?
• Select a safe shop practice.
• What is a result of an electron moving from one atom to another?
• What is the definition of absolute zero?
• Calculate the amount of heat required to change 5 lb of 212°F water to steam.
• What type of power do the outdoor units of VRF systems generally operate on?
• How is the size of an extinguisher related to its ability to put out a fire?
• In a typical residential split-system air conditioner, where is the evaporator located?
• What is the primary chemical family that serves as the building block for most modern refrigerants?
• What is a key characteristic of conduction as a heat transfer method?
• Why were split systems developed in HVAC systems?
• Why does the compression-refrigeration cycle have both high-pressure and low-pressure sides?
• In addition to temperature control, what do most air-conditioning units also manage?
• When multiple indoor units are connected to a heat recovery system, what must be true about their operation?
• What effect does proper insulation have on HVAC efficiency?
• Which of the following is NOT an indoor unit type used in mini-split systems?
• What is the main purpose of personal protective equipment (PPE) in HVACR work?
• What type of refrigeration systems are most commonly used in various applications?
• The principle stating that matter cannot be created or destroyed, but can change form is known as what?
• How many watts are equal to one horsepower of work?
• What does the high pressure in a refrigeration system ensure?
• What role does the EPA have regarding HVACR technicians?
• What creates atmospheric pressure?
• Natural convection is caused by which of the following?
• In a split system air-conditioning unit, what is the small line referred to?
• How is pressure defined?
• What defines a liquid state of matter?
• If an HVACR technician reads 25 in Hg, which type of gauge are they using?
• What are the chemical components of HCFC refrigerants?
• Which term describes the transfer of heat through a fluid when heated fluid rises and cooler fluid sinks?
• What happens to the liquid level in a thermometer when the temperature increases?
• What common complaint do customers often have about service technicians?
• What happens to the state of a zeotropic mixture during evaporation?
• What is the primary focus of the ICE exam?
• What is the primary goal of HVAC/R technicians in their field?
• What is typically found in a refrigeration system’s low-pressure side?
• What should be done if additional piping is installed in a multisplit system?
• At what point does a gas change state?
• What is the name of the line that connects the condenser to the metering device?
• Which two materials are considered good thermal conductors?
• What is the primary function of a heat pump in a mini-split system?
• How do people maintain their steady internal body temperature?
• How can the presence of non-condensables in a refrigerant recovery cylinder be detected?
• In the United States, how is the cooling capacity of air-conditioning equipment expressed?
• What is the primary purpose of an expansion device in a refrigeration system?
• Refrigeration refers to space temperatures:
• What is the temperature range for converting Fahrenheit to BTUs in the context given?
• What type of fittings should be used to avoid the creation of oxides in the refrigeration lines of mini-split systems?
• Which process occurs when air absorbs moisture, resulting in cooling?
• Zeotropes are mixtures of two or more refrigerants that?
• What does enthalpy indicate in air conditioning systems?
• How many tests are required to obtain the EPA 608 universal certification?
• What do commercial central heating and cooling systems typically refer to?
• The refrigeration cycle is maintained by what type of pressure difference?
• In the context of HVAC, what does BTU stand for?
• What method can be used to detect non-condensables in a refrigerant recovery cylinder?
• In what scenario might a variable refrigerant flow (VRF) system be preferred over traditional HVAC systems?
• What does the refrigerant safety designation A2 indicate?
• What physical principle is demonstrated by a fan moving room temperature air across us for cooling?
• What is kinetic energy best described as?
• What effect does air movement have on thermal comfort?
• The definition of 'volume' is?
• Which year is considered pivotal for advancements in residential heating and cooling technology?
• Which component of the refrigeration cycle controls the flow of refrigerant to the evaporator?
• Which of the following could lead to inefficient use of tools in a shop?
• A compressor that uses a high-speed impeller to throw the refrigerant outwards is known as a?
• What are gas-packs in HVAC systems?
• What is the purpose of superheating in a refrigeration system?
• During the heating season, how can comfort levels be enhanced at lower temperatures?
• Which lifting technique is recommended to reduce the risk of injury when lifting a heavy item?
• How does increased air velocity affect comfort levels in an HVAC system?
• In terms of ladder safety, why is it important for the top of the ladder to extend above the resting point?
• What was the main purpose of founding North American Technical Excellence (NATE)?
• How would you calculate the heat required to change 5 pounds of ice at 32°F into water?
• What physical property changes when a material is heated and expands?
• At which point in the refrigeration cycle does the refrigerant absorb the most heat?
• A mechanical pressure control is primarily controlled by what component?
• What are atoms composed of?
• At which point in the refrigeration cycle does the refrigerant lose the most heat?
• What is a wet bulb temperature reading?
• In a mixed air system, if the outdoor air is substantially warmer than the return air, what would happen to the mixed air temperature?
• What is potential energy best described as?
• Which of the following is an example of forced convection?
• Which of the following describes the function of a Bourdon tube?
• What function do branch selectors serve in heat recovery VRF systems?
• A refrigerated case that maintains a temperature of 28°F would be classified as what type of system?
• In order to calculate heat flow, one must know the amount of time and what else?
• What type of fluorinated refrigerant has a number that starts with the digit 4?
• What defines a mini-split A/C system that heats in winter and cools in summer?
• What is the temperature where small bubbles first start to form in saturated liquid called?
• What happens to refrigerants as they Expand in the evaporator?
• What factors affect atmospheric pressure?
• Which state of matter has the highest energy level?
• Why is it important to perform a leak test with nitrogen in VRF systems?
• How many grains are there in one pound?
• Who is included in RSES membership?
• Why is electricity distributed using extremely high voltages?
• Which of the following factors does NOT affect the load calculation of an HVAC system?
• What process occurs when dry ice disappears?
• What is most commonly used to transfer heat in mechanical refrigeration systems?
• What is the amount of heat required to change 1 pound of a substance by 1°F called?
• What is the state of matter with the lowest energy level?
• At the inlet of the metering device, what state is the refrigerant typically in?
• Which component is essential in both absorption and compression cycles to remove heat?
• What is the name of the line that connects the compressor to the condenser?
• Circumference is the measure of:
• If a system utilizes 30% outdoor air, with an outdoor temperature of 20°F and a return air temperature of 70°F, what is the mixed air temperature?
• Where is the split system evaporator coil typically located?
• What are the three common states of matter?
• How can refrigeration be best defined?
• What charge do protons possess?
• Energy sources that cannot be replenished are called?
• What is the function of a heat recovery system in HVAC?
• What phenomenon occurs when heat is absorbed during the phase change from ice to water?
• What is the difference between the weight and mass of an object?
• Which type of refrigeration system can be described as utilizing a compressor for vapor compression?
• How is space in a room typically measured?
• An air conditioner with refrigerant R-22 has a low-side pressure of 70 psig and a temperature of 55°F. According to the pressure-temperature chart, what is the state of the refrigerant?
• What factor is essential when performing a heat load calculation?
• Which of the following is NOT a unit of liquid volume in the US?
• In mechanical applications, work is typically measured in which of the following units?
• What happens if refrigerant migration occurs in a refrigeration system?
• How does the human body expel heat when surrounded by an environment warmer than its temperature?
• Which of the following is a primary benefit of convection cooling?
• Window unit air conditioners are primarily designed to cool which of the following?
• What does a hygroscopic lubricant do?
• What safety measure should be taken when entering a confined space?
• What effect does increasing the surface area have on heat transfer rates?
• How does pressure influence the boiling temperature of a liquid?
• What is the primary function of an induced-draft air-cooled condenser?
• What type of heat transfer occurs when campers are heated by a fire outside?
• Which information is required on a Safety Data Sheet (SDS)?
• What is an example of cooling by evaporation?
• What is one potential issue if a mini split system is not properly insulated?
• The triple point of a substance is:
• Area is primarily used to measure which of the following?
• When should you refer to the Safety Data Sheet (SDS) for a chemical product?
• What is the predominant oil of choice for systems using HFC refrigerant?
• What mechanism does the absorption cycle utilize to create the necessary system pressure difference for cooling?
• What is the function of the metering device in a refrigeration cycle?
• Which of the following is responsible for transferring heat in refrigerants?
• What is a common reason for accidents on HVACR job sites?
• What should HVACR technicians do before performing a service?
• What refrigerant do small appliances like household refrigerators and freezers predominantly use now?
• Why is it not advisable to accuse the previous technician of trying to cheat the customer?
• What historical method was used to produce ice over 3,000 years ago?
• What does the law of conservation of matter state?
• What is the pressure at the bottom of a water tank with a cross section of 10 ft² and filled with water to a depth of 40 ft?
• How does the freezing point of water compare with absolute zero?
• What happens to the refrigerant in an evaporator?
• Which process ensures that no liquid slugs reach the compressor and cause damage?
• Which of the following is not included in the unitary small equipment category?
• What must be ensured when multiple compressors are installed in parallel on the same refrigeration system?
• What type of pressure is commonly expressed in inches of water column?
• Which system uses a compressor to manage temperature fluctuations across several cases?
• Which method of freezing preserves the quality and taste of food?
• Which type of oil is predominantly used in systems with HFC refrigerants?
• What describes the relationship between gas volume and temperature in ideal gas behavior?
• Why are fins added to tubing used for heat transfer?
• In HVAC systems, what role does the evaporator play?
• Coal, oil, and natural gas are examples of what?
• Which of the following describes a high temperature refrigeration system?
• What is the designation for OSHA approved high-impact safety glasses?
• What aspect of a window unit makes it less effective for larger spaces?
• What can be a consequence of poor indoor air quality in air-conditioned spaces?
• Which of the following statements is accurate about gases?
• What distinguishes a volume measurement from a rate measurement?
• Why would a medium temperature case, such as one at 35°F, need to defrost?
• What occurs in the condenser during the compression cycle?
• Which system employs compression pumps and condensers to facilitate cooling?
• What is sweating during work an example of?
• What is an important factor to consider when selecting personal protective equipment (PPE)?
• When water enters a refrigeration system, what substance is often created from chemical reactions inside?
• Which method of heat transfer involves the movement of fluid or air?
• What are molecules primarily composed of?
• When performing a heat load calculation for a walk-in cooler or freezer, which factors must be considered?
• Which method of heat transfer is primarily used in a refrigerator?
• Area measurements are used to measure:
• Who developed the quick freezing process for preserving food?
• The insulation of refrigerant lines primarily prevents what issue?
• Who can benefit from the Employment Ready Certifications?
• What is the term used to describe the temperature difference between the bubble point and the dew point of a zeotropic refrigerant?
• Most consumption of electricity and natural gas is used for:
• Energy sources that can be replenished are referred to as what?
• Is it possible for one multi-split indoor unit to heat while another cools?
• What should technicians avoid saying about previous workers?
• Which components maintain the high and low pressures in an absorption refrigeration system?
• What is the outdoor ambient temperature for AHRI rating condition "A"?
• What type of refrigerant has the lowest impact on ozone depletion?
• How does natural gas travel through pipelines from the well head to the end user?
• Electricity is defined as the flow of what?
• Which type of refrigerants has the highest ozone depletion potential?
• How many major components are included in the mechanical vapor compression refrigeration cycle?
• What effects do pressure differences have on fluid movement within HVAC systems?
• What type of HVAC work often necessitates a criminal background check?
• What term do technicians use for the temperature at which water vapor begins to condense?
• Where are the condenser and compressor located in a typical residential split-system air conditioner?
• What is the purpose of a check valve in the suction line of the lowest temperature coil in a multiple evaporator system?
• Which statement accurately describes the movement of electrons?
• What is the main advantage of using split systems in HVAC?
• Which chemical family serves as the basic building block for most modern refrigerants?
• When can changes in the volume of a gas occur?
• In refrigeration systems, what is the role of the metering device?
• How can the effectiveness of evaporative cooling be increased?
• What is a main characteristic of gauge pressure?
• In what time period did residential central heating and cooling systems become popular?
• In a mini split system, which lines typically need to be insulated?
• During which process do refrigerants release heat?
• Which of the following refrigerants is a fluorinated compound whose number starts with a 4?
• What is a major advantage of mini-split air-conditioning systems?
• What role does the metering device play in a refrigeration system?
• What occurs to the temperature of a substance during a phase change?
• What is the main component that facilitates the function of a thermoelectric cooling system?
• How many wires typically connect the outdoor unit to the indoor unit of a mini-split system?
• Why should HVACR students consider joining a trade association?
• Which action is NOT recommended immediately following an accident?
• How are commercial refrigeration equipment categories defined?
• Which of the following best describes conduction in HVAC?
• Why is safe driving crucial in the HVACR profession?
• Residential heating systems typically range from:
• Which safety practice is essential when working alone on HVACR jobs?
• The AHRI definition of standard air is:
• What heating options are available for package air conditioning units?
• How does the law of conservation of matter describe the evaporation of water?
• Which organization focuses on the education and training of HVAC/R technicians?
• What distinguishes the ICE exams from the Employment Ready Certifications?
• What is defined as any pressure less than atmospheric pressure?
• Which line in a split system air conditioner typically carries high-pressure refrigerant vapor?
• What type of oil was initially used with R-134a automotive systems?
• What is the first step in selecting commercial refrigeration equipment for a new installation?
• Where is the suction accumulator typically located in a refrigeration system?
• What type of oil is most commonly used with CFCs and HCFCs?
• What is the line that connects the evaporator to the compressor called?
• What is commonly not a benefit of using a mini-split air conditioning system?
• What is the term for the measurement of total heat content of air in BTUs per pound?
• A compressor that operates by squeezing gas between the piston and a valve plate is called a?
• A refrigeration system that operates using the Peltier effect is known as what?
• Density is defined as:
• What happens to the temperature of a liquid when it boils?
• In new residential air conditioning systems, which refrigerant is predominantly used?
• What would be a common indicator of refrigerant contamination?
• What does the term "non-condensables" refer to in the context of refrigerants?
• What substance is commonly used as a reference to measure specific gravity of solids?
• How far should the top of an extension ladder extend above the point where it rests on the building?
• What type of measurement is stated in square feet?
• What is the major concern with ammonia refrigerant?
• What is the process called when experiencing a chill near a cold wall?
• What determines the pressure of a refrigerant cylinder containing saturated refrigerant?
• What is the primary role of the evaporator in a refrigeration system?
• To avoid electrical shock, what class fire extinguisher should be used on electrical equipment?
• Which of the following is NOT one of the four types of cooling mechanisms?
• How can you easily maintain SDS documents?
• How many fire extinguishers are sufficient in a work area?
• Which property of water changes when it transforms from ice to liquid?
• The pointer on a dial-type thermometer is moved by a:
• What units are typically used to measure vacuum?
• What is ozone composed of?
• The three states of matter primarily represent what concept?
• Convert a pressure of 10 psi to inches of mercury. How many inches of mercury is the pressure?
• Which physical properties are most often measured in HVAC?
• What capability do the smallest capacity VRF outdoor units generally have compared to the largest multi-split units?
• What is true about materials that are good electrical conductors?
• Why might a bad driving record make it difficult to get a job at a service company?
• Which refrigerant is considered zeotropic?
• In the compression refrigeration cycle, at what point is the refrigerant superheated?
• What process is primarily responsible for the absorption of heat in refrigeration systems?
• How is the energy efficiency ratio (EER) calculated?
• Which of the following best describes conduction?
• What characteristic defines zeotropes in the context of refrigerants?
• What happens to the refrigerant on the low-pressure side of a compression cycle refrigeration system?
• What role does temperature play in convection heating and cooling systems?
• What principle does the first law of thermodynamics illustrate?
• What is the main purpose of increasing voltage in electrical transmission?
• What is the characteristic of a hygroscopic lubricant?
• Which of the following is NOT typically a characteristic of HFC refrigerants?
• What should you provide to the customer upon completion of HVAC services?
• How can maintaining an orderly shop be beneficial?
• Units that require more than one measurement and cannot be measured in base units are known as what?
• How can comfort levels be improved in the cooling season at higher temperatures?
• Who is recognized for the invention of modern air conditioning?
• In the refrigerant safety rating B1, what does the number 1 indicate?
• Which method of heat transfer is involved in radiation?
• In heat pump applications, which mode is not typically available with a heat recovery system?
• Which of the following materials is typically used in HVAC insulation?
• How do codes differ from standards in the HVAC/R industry?
• Why is it important to insulate both tubes of a mini split line set?
• Why are both tubes of a mini split lineset insulated?
• How does a boiling liquid affect the heat of its container?
• Which refrigerant is widely used in commercial refrigeration systems for its efficiency?
• Which of the following best describes the bubble point in refrigeration?
• What happens to the pressure of a gas when the temperature is increased while the volume remains constant?
• What is the measurement of the total heat content of the air, expressed in BTUs per pound of air?
• Which of the following is commonly used to estimate the size of a room?
• What are the chemical components of CFC refrigerants?
• What is a primary benefit of using inverter-driven systems in VRF systems?
• A system that supports simultaneous heating and cooling for different areas of a building is referred to as what?
• In an HVAC context, what does a psychrometric chart primarily illustrate?
• Which type of fan is predominantly used in air-cooled condensing units?
• When should you inform a customer about the cost of a needed part?
• What components in a compression refrigeration system maintain the pressure difference?
• What are three common methods for controlling evaporator temperature?
• What is a common refrigerant recovery device used in HVAC?
• Why is the number 3.41 significant in calculating BTU?
• What type of pressure do HVACR technicians use that compares pressure to atmospheric pressure?
• What occurs when atoms join to form a new molecule?
• How can you determine what PPE should be used with any particular chemical product?
• In refrigeration terminology, what is the purpose of the suction line?
• How do evaporative cooling systems function?
• What type of compressor utilizes rotating screws shaped like augers?
• A process that moves horizontally on a psychrometric chart is known as?
• When is the defrost cycle typically terminated?
• Why is regular maintenance important in HVAC systems?
• A refrigerant properties chart calls for 100 psia. What reading would you see on your gauges?
• If molecules in substance-A are moving faster than in substance-B, which substance has a higher temperature?
• What happens to saturated gases when heat is removed?
• Who is eligible to take the ICE exam?
• What is the relationship between atoms and molecules?
• When measuring the area of a surface for HVAC purposes, which unit is typically used?
• Which component of a split system is located outside the building?
• What is one of the main functions of a condenser in an HVAC system?
• What is the main purpose of insulating HVAC refrigerant lines?
• Who must certify HVACR technicians?
• In terms of safety ratings, what does a high toxicity letter indicate?
• Which type of compressor uses an orbital motion roller to compress gas?
• Pressure controls can be divided into which two groups?
• According to the second law of thermodynamics, how does heat travel?
• Which of the following is a safe practice regarding tool organization in a work environment?
• In mini-split style systems, the refrigerant lines are typically connected using what type of fittings?
• What property describes the ability of a material to conduct electricity?
• If the saturation temperature for 12 lb of pressure is 36.9°F and the actual refrigerant temperature is 35.2°F, what can be inferred about the refrigerant?
• What units are used to measure volume?
• What does a barometer measure?
• In heat recovery systems, what can be unique about the operation of multiple indoor units?
• What is the main characteristic of a refrigeration cycle?
• What should be ensured to enhance safety while handling refrigerants?
• Units in the SI measurement system are primarily subdivided into what?
• Which component is crucial for adjusting the refrigerant flow in a VRF system?
• Which of the following defines a characteristic of liquids when compared to gases?
• As the distance between two objects increases, what happens to the radiant energy transferred between them?
• What is the typical speed range for condenser fan motors?
• What is the primary function of the compressor in the refrigeration cycle?
• What type of energy transformation occurs within a refrigeration cycle?
• Which of the following describes a gas at standard atmospheric conditions?
• What is the result when a substance reaches its saturation point?
• What does RSES stand for?
• What are the main divisions of the HVAC/R industry focused on?
• To convert 5 lb of ice at 32°F to water, how much heat is required?
• What is the primary role of pressure in a heating system?
• In a mechanical vapor compression refrigeration cycle, high-pressure vapor moves to which component?
• Why is the capacity of air conditioning units commonly expressed in tons?
• Which measurement would you typically use to express the weight of a refrigerant?
• What is the curved oval metal tube inside a gauge called?
• A technician pushes a 50-lb box 4 feet in 2 seconds. What is the rate of work done?
• How does the refrigerant in a mechanical compression refrigeration system absorb and release heat?
• What is a psychrometric chart?
• In HVAC, what does the term "load shift" refer to?
• What device in a refrigeration system is responsible for absorbing heat?
• What happens to the volume of a gas when the temperature increases, assuming pressure remains constant?
• What characteristic is unique to water vapor compared to other states of water?
• What is a key safety procedure to follow when working with tools?
• When wiring multisplit systems, what is essential for proper connection?
• What is commonly used to control defrost operations in refrigeration systems?
• What is the temperature called where small droplets of liquid first start to form in a saturated gas?
• What happens to comfort levels if multiple indoor units operate out of phase in a heat recovery system?
• Which lubricant is recognized as a promising new option for refrigerants?
• What is a critical consideration when designing a heating and cooling system to handle load shifts?
• What is the total pressure in a mixture of gases equal to?
• Which units can describe the density of a substance?
• For proper ventilation in a building, what must occur?
• How does heating mode in a heat recovery system affect indoor units?
• How does a saturated gas behave differently from an ideal gas?
• Which of the following is a common practice to improve workplace safety?
• Which of the following forms of heat travels in waves?
• What types of systems are particularly well-suited to split system design?
• What is the primary function of branch selectors in heat recovery VRF systems?
• Why is voltage increased for electricity transmission over long distances?
• What type of energy is stored in a battery?
• Which system is designed to allow simultaneous heating and cooling?
• What is the characteristic of a forced-draft air-cooled condenser?
• What change occurs when an ice cube melts?
• Cubic yards are typically used to measure what?
• Fluorinated refrigerants that have a number starting with a 5 are classified as what type?
• What is the estimated length of a wall that has 31 studs spaced 16 inches on center?
• What is a graphical representation of air properties called?
• Which component of an air conditioning system is responsible for removing heat from the indoor air?
• What is the primary function of a mechanical refrigeration system?
• What issue can occur in air conditioning systems that do not control air quality?
• What element is crucial for setting the appropriate defrost schedule in refrigeration?
• What distinguishes residential heating and cooling systems from commercial/industrial systems?
• What happens to molecular motion at absolute zero?
• How will decreasing the size of a container holding gas affect the gas in the container?
• What is the main factor affecting the rate of heat transfer in HVAC systems?
• Specific volume can be described using which of the following units?
• According to Pascal's law, what happens to the pressure of a propane tank as it empties?
• Who patented the first air-conditioning system in 1844?
• Where in the refrigeration process does condensation primarily occur?
• A refrigerant's safety rating combines the toxicity letter and what other factor?
• What principle do glass stem thermometers operate on?
• How can atmospheric pressure affect refrigeration gauge pressure readings?
• What class fire extinguisher should be used to safely extinguish a flammable liquid?
• What does the 'ton' in tons of refrigeration refer to in HVAC terminology?
• Getting a chill when standing near a cold wall is an example of what type of cooling?
• A refrigerant's safety rating includes which two components?
• Which refrigerant is primarily used in new residential air conditioning systems?
• How do refrigerants absorb heat during their cooling cycle?
• What are the four major components of the mechanical vapor compression refrigeration cycle?
• What will be the volume of a gas after heating 2 ft³ at 50 psia from 300° R to 600° R?
• What is one of the core components of HVACR system maintenance?
• What is the physical change of state that is the opposite of deposition?
• How is power supplied to a mini-split system?
• When should personal protective equipment (PPE) be worn during HVACR work?
• How should accidents be reported to the company office?
• Cooling by moving air across a surface that has room temperature is known as which of the following?
• How much heat in BTU is required to change the temperature of 10 lb of copper from 100°F to 150°F?
• How are refrigerants with a higher toxicity level labeled?
• In the compression refrigeration cycle, where is the refrigerant saturated?
• What is an important characteristic of azeotropic refrigerants?
• What is the primary function of a refrigeration system in relation to heat?
• When is the defrost cycle typically terminated?
• What does it indicate if an air conditioner using refrigerant R-134a has a low-side pressure of 35 psig and a temperature of 40°F?
• What is the range of residential air conditioner capacities in BTUH?
• What process describes the release of moisture by a substance in HVAC systems?
• Rate of work in HVAC systems is typically measured in what unit?
• What is the main difference between a liquid receiver and a suction accumulator?
• Why is it important to use tools only for their intended purpose?
• What type of refrigerant line connections may be used on multisplit systems?
• Which components do modern thermoelectric modules utilize to create the Peltier effect?
• What happens if an HVAC system is undersized?
• What is the standard unit for all forms of energy in the SI system?
• Why do many national and international trade associations hold trade shows?
• What elements make up HFCs?
• Why should an evaporator not be placed above a door in a walk-in cooler or freezer?