All Introduction to HVACR Cards Flashcards
A(n) ________ is a heat exchanger that transfers heat from the air or liquid flowing over it to the cooler refrigerant flowing through it.
Evaporator
Designing a building that focuses on minimizing environmental impact and energy consumption means that you’ll need to use ________ techniques.
Sustainable construction
The metal plates that transfer heat to air in a forced-air heating system form an assembly called a _____.
heat exchanger
Which of these companies is most likely to install HVACR equipment during the construction of a large office building?
Mechanical contractor
One way ventilation can be defined as a _____.
means of introducing outside air into a building to improve air quality
What is the term for the introduction of fresh air into an enclosed space to improve air quality?
Ventilation
A substance that contains no water can be referred to as ________.
Anhydrous
Which of the following produces carbon monoxide?
Furnaces burning natural gas or propane
Releasing refrigerants to the atmosphere is _____.
prohibited by federal law
The device that lowers the temperature of the refrigerant before it enters the evaporator is the _____.
expansion device
Water or steam is often used in heating systems as a(n) _____.
heat-exchange medium
________ is a flexible sealant used to seal duct and insulation joints.
Mastic
Ventilation is the process of _____.
introducing fresh air into a building
Exposure to ________ can reduce or eliminate bacteria and viruses.
Ultraviolet (UV) light
The mechanical device that converts low-pressure, low-temperature refrigerant vapor into high-temperature, high-pressure vapor is the ________.
Compressor
The two heat exchangers in the mechanical refrigeration cycle are the _____.
evaporator and condenser
In an electric-resistance heating system, electricity is used to heat _______.
coils of heavy wire
According to OSHA regulations, technicians must use personal fall protection equipment when working at heights above ____.
6’ (1.8 m)
The term mechanical refrigeration cycle refers to _____.
the process by which circulating refrigerant absorbs heat in one location and moves it to another location
The movement of heat energy from a warmer substance to a cooler substance is known as ________.
Heat transfer
A colorless, tasteless, and odorless toxic gas that is a common byproduct of combustion processes is ________.
Carbon monoxide (CO)
A substance harmful to your health and potentially lethal is said to be ________.
Noxious
The size of HVACR equipment has no impact on the LEED certification standards.
FALSE
Which component of a mechanical refrigeration system is a heat exchanger that transfers heat from the warm indoor air to the cold refrigerant running through it?
Evaporator
Compared to the outdoor air, the refrigerant entering the condenser is _____.
warmer
An important difference between codes and standards is that_______.
codes are enforced by law
________ systems use water as a heat-transfer medium.
Hydronic
To ________ a refrigerant means to circulate it through filtering devices to remove moisture, acid, and other contaminants, in the shop or in the field.
Recycle
What temperature divides air conditioning applications from refrigeration?
60 degrees°F (16 degrees°C)
Cooling units that typically contain a compressor, condenser coil, condenser fan, and devices for compressor control and operation are called ________.
Condensing units
Recovery is a process in which a refrigerant is _____.
removed and stored
The expansion device in the mechanical refrigeration cycle _____.
lowers the refrigerant pressure entering the evaporator
In a hydronic heating system, the heat exchange medium is _____.
water
Which element of a mechanical refrigeration system transfers heat from a refrigerant to air or water flowing over it, enabling the change of state from a vapor to a liquid?
Condenser
To ________ a refrigerant means to remove it from a system and place it in containers approved for that purpose.
Recover
A company must ________ any used refrigerant to meet the standards of purity required of new refrigerant before it can be resold.
Reclaim
A(n) ________ is a heat exchanger that transfers heat from the refrigerant flowing inside it to the air or water flowing over it, enabling the change of state from a vapor to a liquid.
Condenser
To be resold to other customers, a refrigerant must have been _____.
reclaimed
In a typical mechanical refrigeration system, heat is transferred from the indoor air to the refrigerant at the _____.
evaporator
The equipment that is able to extract heat from the outside air by reversing the refrigeration cycle is called a(n) _____.
heat pump
Before attempting to restart the burner when servicing an oil furnace, what can you do to avoid a possible explosion?
Allow accumulated oil to vaporize and leave the chamber.
Units that can produce heat by reversing the mechanical refrigeration cycle are called ________.
Heat pumps
A refrigerant metering device is commonly referred to as a(n) ________.
Expansion device
What program identifies energy efficient products and designs?
ENERGY STAR
Before starting work on a building, a contractor must apply for a ______.
permit
A refrigerant compound that contains chlorine, fluorine, and carbon is called a(n) ________.
Chlorofluorocarbon (CFC)
________ describes the uncontrolled entry of outside air into a building or occupied space
Infiltration
Which element of a mechanical refrigeration system creates the pressure differential necessary for refrigerant to flow?
Compressor
The growth of bacteria and other harmful organisms can be reduced or eliminated by _____.
ultraviolet (UV) light
The ________ results in heat being trapped below Earth’s atmosphere instead of allowing it to radiate into space.
Greenhouse effect
The process that depends on machinery and phase-changing refrigerants to absorb heat from one location and transfer it to another location is called the ________.
Mechanical refrigeration cycle
Systems that use water or steam as the primary heat-exchange medium are known as _____.
hydronic
Mandatory directives that regulate construction are called _____.
building codes
An ERV uses cooled or heated air exiting the building to _____.
pre-condition fresh air being forced into the occupied space
A refrigerant compound that contains hydrogen, chlorine, fluorine, and carbon is called a(n) ________.
Hydrochlorofluorocarbon (HCFC)
In a common residential forced-air furnace, heat is transferred from the ________.
heat exchangers to the air
A person who handles refrigerants must pass a written examination to become certified by which organization?
EPA
A person must have EPA certification to _____.
buy or use refrigerant
A funded performance guarantee, called a(n) ________, might have to be posted by a contractor to gain licensure.
Surety bond
