BOMA-HVAC Practice Test

These questions are part of the practice quiz. Start practicing

• In what type of compressor is a mechanical shaft seal necessary?
• How does a heat pump operate?
• A pressurestat responds to _____.
• How does effective HVAC control benefit a building?
• What role do thermostats play in HVAC systems?
• What is the function of a thermal expansion valve (TXV)?
• High relative humidity can affect human comfort by making the air feel _____ than it actually is.
• What are the four processes that comprise the refrigeration cycle?
• What term describes the expansion or contraction of a gas without a change in temperature?
• Air flow through a duct exhibits the highest velocity where?
• Why is insulation important in HVAC systems?
• Relative humidity indicates the amount of _____?
• What preventative step can extend the life of an HVAC system?
• What is radiant heating?
• A high limit control is typically responsible for _____.
• What does an HVAC system primarily use to control indoor temperature?
• What does CFM stand for and why is it important in HVAC?
• What system component is typically checked during HVAC maintenance to ensure efficiency?
• How does the principle of 'heat transfer' apply to HVAC systems?
• What is a key advantage of using a flooded type evaporator?
• How do economizers affect centrifugal chiller performance?
• A three-way diverting valve has _____.
• Which device is primarily used to measure the moisture content of air?
• In a centrifugal fan, the direction of air movement is generally?
• What do 'direct expansion' systems use to cool the air?
• What does the term 'latent heat' refer to in HVAC terminology?
• The evaporator pressure regulator (EPR) _____.
• The flow control device used to maintain system temperature is the _____.
• What is the primary function of the pump out unit?
• The heat required to melt 1 pound of ice at 32 degrees to water at sea level is equal to _____?
• What is the primary function of the expansion valve in an HVAC system?
• What is the primary function of an evaporator in a refrigeration system?
• When wet bulb and dry bulb temperatures are the same, this indicates a relative humidity of _____?
• What is condensation, and why is it significant in HVAC?
• Which of the following statements does NOT pertain to the fan laws?
• Effective temperature can be impacted by environmental factors such as _____.
• What is the recommended standard temperature for the thermostat setting for comfort cooling?
• As the temperature of refrigerants increases, how does it affect the rate of heat transfer?
• Which of the following natural laws has the least bearing on the science of air conditioning?
• What is the advantage of using programmable thermostats in HVAC systems?
• Why does steam release a significant amount of heat?
• An accumulator in a refrigeration system prevents slugging by separating what?
• What is often a key benefit of using speed control in HVAC systems?
• Which statement does NOT apply to backward inclined fans?
• What is the typical indoor relative humidity range recommended for comfort in HVAC systems?
• What does air filtration in HVAC refer to?
• Which of the following describes a key function of HVAC maintenance?
• Which of the following is the least likely cause of high suction pressure in a refrigeration system?
• What is the purpose of using low-emission materials in buildings?
• How does improper thermostat calibration directly affect a building?
• In an evaporator coil, which components are referred to as the primary surface?
• What is the difference between a split HVAC system and a packaged system?
• What is the term for the temperature at which boiling occurs in any liquid?
• During the refrigeration cycle, what occurs at the evaporator?
• What aspect of HVAC systems can be measured and managed through automation?
• What are the two main classifications of compressors?
• Enthalpy refers to the _____.
• What is one reason systems may operate inefficiently?
• What is one benefit of monitoring HVAC systems through automation?
• In HVAC systems, the primary objective of a load limiting mechanism is to:
• Which component is essential for maintaining effective cooling in an HVAC system?
• What is the partial pressure due to air in a centrifugal unit operating with R11 at 8.8 PSIG condensing pressure?
• What is the purpose of a liquid line heat exchanger?
• What is the difference between sensible heat and latent heat?
• What is one benefit of increased ventilation in indoor spaces?
• The heat absorbed after the refrigerant has vaporized becomes _____?
• A dualing switch is used to _____.
• When analyzing HVAC performance, which factor is crucial in determining system efficiency?
• In which component of a refrigeration system does the refrigeration effect primarily occur?
• Which factor is critical when selecting a compressor for a specific application?
• What is the importance of indoor air quality (IAQ)?
• Effective temperature considers the combined effects of which two factors?
• Which of the following is NOT a primary function of HVAC systems?
• What precaution should be taken when handling refrigerants?
• What does BOMA stand for in the context of HVAC?
• What is considered an excellent heat carrier because it _____?
• What maintenance task should be performed regularly on HVAC filters?
• What type of heat does the condenser reject?
• Which strategy is effective for improving indoor air quality in buildings?
• How does outdoor air temperature affect HVAC system efficiency?
• The dry bulb temperature is _____?
• What type of HVAC system uses water to distribute heat?
• What does the acronym VRF stand for?
• Why might an organization choose to implement BAS?
• A proportional control is defined as:
• What are common indicators of system failure in HVAC systems?
• How can BAS contribute to occupant comfort?
• What does SEER stand for in HVAC terminology?
• In HVAC terminology, what does BTU represent?
• The speed of air through a duct is measured in _____?
• What is the purpose of an air handling unit (AHU)?
• The metering device is designed to _____.
• If a duct measures 24x18 inches and air flows at a velocity of 450 feet per minute, what is the volume of air moving through it?
• In commercial buildings, the heat generated by lights does not seriously affect control of the heating system?
• What does efficient HVAC management via BAS contribute to?
• What effect does lower voltage have on the starting torque of a compressor motor?
• Centrifugal compressors are typically more efficient than reciprocating compressors due to their _____?
• What is the purpose of a condensate drain in an HVAC system?
• What is often a consequence of neglecting regular HVAC maintenance?
• Among the listed fuels, which one is recognized as the most efficient?
• A feature of a Variable Air Volume (VAV) system is that it?
• What is the primary purpose of building automation systems (BAS) in HVAC?
• A psychometric chart is a graphic representation of _____?
• What is a common consequence of poor ventilation in buildings?
• How is the movement of the pre-rotation vanes controlled?
• Which element constitutes the highest percentage by volume in air?
• For practical purposes, what does the low side of a refrigeration system encompass?
• Heat which causes a change of state is _____.
• What is the primary purpose of HVAC systems in buildings?
• The expansion valve is a _____ device that controls the flow of liquid refrigerant to the evaporator coil under varying load conditions?
• What maintenance tasks are essential for HVAC system efficiency?
• What is the primary function of a primary control?
• What is the function of a psychrometer in HVAC systems?
• Which of the following terms describes air movement through a duct?
• A ratio relay is primarily used to _____.
• Which type of expansion valve is rarely utilized in refrigeration systems?
• The most common type of heat pump used is the _____ heat pump?
• What effect does high humidity have in HVAC environments?
• Which type of control would be used to prevent the system from overheating?
• It is commonly held that a relative humidity of _____ percent is desirable?
• The refrigeration effect of a refrigerant is improved by _____.
• What is the function of the compressor in an HVAC system?
• A low limit control is primarily used to _____.
• The element that makes up the most percentage of air is _____?
• In HVAC, what does the term 'air exchange rate' refer to?
• The quantity of air moving through a fan system is expressed in _____?
• An A/C system with zone control that mixes hot and cold air in response to room thermostats is a _____ system?
• The liquid line in a refrigeration system connects which two components?
• Which of the following factors can influence indoor air quality?
• What does an HVAC system typically filter from indoor air?
• In HVAC systems, what do we refer to as 'infiltration'?
• What is the purpose of an exhaust fan in an HVAC system?
• In air quality control, what does "purity" refer to?
• What are the three main components of an HVAC system?
• What is the primary purpose of a furnace in an HVAC system?
• The quantity of air moving through a fan system is typically expressed in what unit?
• An automatic expansion valve is primarily controlled by what factor?
• What does psychrometry study?
• What impact does a higher condensing temperature have on refrigerant systems?
• How does a pressurestat typically operate?
• Outside air may enter air conditioned spaces by _____?
• Who is recognized as the pioneer in the field of air-conditioning?
• What is a refrigerant's role in an HVAC system?
• What is the main use of a three-way diverting valve?
• Which factor controls the low side float in a refrigeration system?
• What should be monitored to ensure an HVAC system is functioning properly?
• What is the primary function of an HVAC 'chiller'?
• What can result from poorly calibrated thermostats?
• Air conditioning is concerned with controlling which four elements?
• The purpose of a primary control is to _____.
• What characterizes double duct systems in HVAC?
• What is the significance of duct sizing in HVAC systems?
• How can occupancy schedules affect energy efficiency in HVAC systems?
• What type of fan is mostly used in HVAC and industrial systems?
• Utilizing the same conditions, what is the partial pressure due to the refrigerant R11?
• What is the role of an economizer in an HVAC system?
• The heat absorbed by the evaporator is referred to as the heat:
• What are two common types of air conditioners?
• What does the acronym ASHRAE stand for?
• What do prerotation vanes control in an HVAC system?
• How are HVAC systems rated for energy efficiency?
• What does an automatic expansion valve control in a refrigeration system?
• Calculations involving heat load of people takes into consideration heat due to _____ and _____.
• What is the role of dampers in an HVAC system?
• In a mechanical refrigeration system, where is the compressor located?
• What is the primary purpose of a receiver in a refrigeration system?
• What does the term 'zone control' refer to in HVAC?
• What is the primary function of a heat exchanger in a refrigeration system?
• What is the primary purpose of measuring air pressure in ductwork?
• What is a common result of inadequate insulation in HVAC systems?
• What factors can affect the efficiency of an HVAC system?
• What characteristic of a system could potentially lead to low efficiency rates?
• What effect does increasing the speed of a fan generally have on airflow?
• The primary function of a fan in an HVAC system is to?
• The instrument most commonly used to measure air pressure in ducts is called a?
• In the refrigeration cycle, the medium that picks up the heat is the _____.
• What is 'ventilation' in the context of HVAC?
• The oil safety switch is operated by _____.
• What is defined as the amount of moisture in the air compared to how much it can hold?
• What are 'fan coils' used for?
• What crucial factor does human well-being largely depend on?
• What do economizers achieve with the same power input?
• How can one distinguish a capacitor for a DC circuit from one for an AC circuit?
• A heat exchanger _____.
• What happens to the starting torque of a motor if a 230 volt PFC compressor tries to start at 184 volts?
• A dualing switch typically functions to change controls from _____.
• What is a variable air volume (VAV) system?
• Why is regular maintenance important for HVAC systems?
• The performance of air to air heat pumps is primarily influenced by which factor?
• What is a potential outcome of an automated HVAC system?
• What is the primary function of the economizer in a cooling system?
• What is considered the most efficient method of capacity control in HVAC systems?
• What is the significance of balancing an HVAC system?
• What is true regarding cylinder head bypass in multi-cylinder compressor systems?
• Enthalpy refers to the _____?
• The speed of a centrifugal compressor as compared to reciprocating compressors is _____?
• What might indicate a refrigerant leak in an HVAC system?
• What are the common types of heating systems in HVAC?
• Relative humidity is essential in determining what aspect of air?
• A thermal electric expansion valve is controlled by what device?
• When chemically cleaning a water system with scale, which chemical is recommended?
• What is the primary function of the purge unit in a centrifugal chiller?
• Limit controls are generally wired into the circuit in _____.
• Heat will continue to flow between two bodies until they have the same amount of _____.
• What type of HVAC system uses ducts to distribute air?
• Which of the following types of fans are classified as centrifugal fans?
• What device limits the opening of the pre-rotation vanes during startup?