In a standard vapor-compression refrigeration cycle, what is the primary function of the compressor?
Refrigeration Cycle
Question · Easy
What are the four main components of the basic vapor-compression refrigeration cycle?
What physical state change does the refrigerant undergo in the evaporator coil?
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Superheat is defined as the temperature of a refrigerant vapor above its:
Refrigerant Management
What is subcooling in a refrigeration system?
Which refrigerant has been the most common replacement for R-22 in residential air conditioning and heat pump systems?
What does SEER stand for in HVAC equipment ratings?
System Performance
What is the function of the reversing valve in a heat pump system?
Heat Pump Systems
According to BPI standards, what is the primary purpose of combustion appliance zone (CAZ) testing?
Health And Safety
What instrument is used to measure static pressure in a duct system?
Airflow And Distribution
A properly functioning TXV (thermostatic expansion valve) maintains a relatively constant:
Question · Medium
What is the correct method for checking refrigerant charge on a system with a fixed orifice metering device?
During a heat pump's defrost cycle, the system temporarily operates in:
What is the purpose of auxiliary (backup) heat in an air-source heat pump system?
What does the HSPF rating measure for a heat pump?
When measuring total external static pressure (TESP) on a forced-air system, where should the pressure taps be placed?
A BPI professional measures the temperature drop (delta-T) across the evaporator coil in cooling mode. What is the typical target range?
What is the standard airflow requirement per ton of cooling capacity for residential AC systems?
R-32 refrigerant is classified as which type of refrigerant?
What is the primary advantage of a ground-source (geothermal) heat pump over an air-source heat pump?
What is the purpose of Manual J in HVAC system design?
System Design
ACCA Manual S is used to determine:
In a ductless mini-split system, what connects the indoor and outdoor units?
What is the significance of the balance point in heat pump operation?
Which type of compressor is most commonly used in residential mini-split and variable-speed heat pump systems?
System Components
What is the primary cause of ice formation on an evaporator coil during cooling operation?
According to ANSI/BPI-1200 standards, what is the action level for carbon monoxide (CO) in ambient air of the combustion appliance zone?
What is the primary purpose of a filter drier in a refrigeration circuit?
Which duct leakage measurement method uses a calibrated fan to pressurize the duct system?
What does EER (Energy Efficiency Ratio) measure for an air conditioning system?
A heat pump system in heating mode has a high suction pressure and low superheat. What is the most likely cause?
Question · Hard
What is the minimum SEER2 efficiency standard for residential central air conditioners installed in the southern United States as of 2023?
In a building with a tight envelope and exhaust-only ventilation, what is the concern for naturally drafted combustion appliances?
What is the purpose of an accumulator in a heat pump system?
Which of the following best describes latent cooling?
Indoor Air Quality
A BPI professional finds that a heat pump system has a dirty outdoor coil. In cooling mode, what effect does this have on system performance?
What type of ground loop configuration uses vertical boreholes for a geothermal heat pump?
R-454B is a next-generation refrigerant intended to replace R-410A. What is its ASHRAE safety classification?
When performing worst-case depressurization testing per BPI protocols, which exhaust devices should be turned on?
A scroll compressor operates by using:
What is the sensible heat ratio (SHR) of a cooling system?
Which ASHRAE standard establishes minimum mechanical ventilation requirements for residential buildings?
A technician measures 12°F of superheat on a fixed-orifice system when the charging chart indicates 15°F. What should be done?
What is the typical coefficient of performance (COP) range for an air-source heat pump operating at moderate outdoor temperatures (around 47°F)?
What building science principle explains why warm, moist air moves toward cooler, drier areas through building assemblies?
Building Science
A multi-zone mini-split system is experiencing one zone with poor cooling while other zones work fine. What is the most likely cause?
What is the purpose of a crankcase heater on a compressor?
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