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Module One - Introduction to HVACR > All Introduction to HVACR Cards > Flashcards

All Introduction to HVACR Cards Flashcards

1
Q

A(n) ________ is a heat exchanger that transfers heat from the air or liquid flowing over it to the cooler refrigerant flowing through it.

A

Evaporator

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2
Q

Designing a building that focuses on minimizing environmental impact and energy consumption means that​ you’ll need to use​ ________ techniques.

A

Sustainable construction

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3
Q

The metal plates that transfer heat to air in a​ forced-air heating system form an assembly called a​ _____.

A

heat exchanger

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4
Q

Which of these companies is most likely to install HVACR equipment during the construction of a large office​ building?

A

Mechanical contractor

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5
Q

One way ventilation can be defined as a​ _____.

A

means of introducing outside air into a building to improve air quality

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6
Q

What is the term for the introduction of fresh air into an enclosed space to improve air​ quality?

A

Ventilation

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7
Q

A substance that contains no water can be referred to as​ ________.

A

Anhydrous

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8
Q

Which of the following produces carbon​ monoxide?

A

Furnaces burning natural gas or propane

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9
Q

Releasing refrigerants to the atmosphere is​ _____.

A

prohibited by federal law

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10
Q

The device that lowers the temperature of the refrigerant before it enters the evaporator is the​ _____.

A

expansion device

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11
Q

Water or steam is often used in heating systems as​ a(n) _____.

A

​heat-exchange medium

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12
Q

​________ is a flexible sealant used to seal duct and insulation joints.

A

Mastic

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13
Q

Ventilation is the process of​ _____.

A

introducing fresh air into a building

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14
Q

Exposure to​ ________ can reduce or eliminate bacteria and viruses.

A

Ultraviolet (UV) light

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15
Q

The mechanical device that converts​ low-pressure, low-temperature refrigerant vapor into​ high-temperature, high-pressure vapor is the​ ________.

A

Compressor

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16
Q

The two heat exchangers in the mechanical refrigeration cycle are the​ _____.

A

evaporator and condenser

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17
Q

In an​ electric-resistance heating​ system, electricity is used to heat​ _______.

A

coils of heavy wire

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18
Q

According to OSHA​ regulations, technicians must use personal fall protection equipment when working at heights above​ ____.

A

​6’ (1.8​ m)

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19
Q

The term mechanical refrigeration cycle refers to​ _____.

A

the process by which circulating refrigerant absorbs heat in one location and moves it to another location

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20
Q

The movement of heat energy from a warmer substance to a cooler substance is known as​ ________.

A

Heat transfer

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21
Q

A​ colorless, tasteless, and odorless toxic gas that is a common byproduct of combustion processes is​ ________.

A

Carbon monoxide (CO)

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22
Q

A substance harmful to your health and potentially lethal is said to be​ ________.

A

Noxious

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23
Q

The size of HVACR equipment has no impact on the LEED certification standards.

A

FALSE

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24
Q

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?

A

Evaporator

25
Q

Compared to the outdoor​ air, the refrigerant entering the condenser is​ _____.

A

warmer

26
Q

An important difference between codes and standards is​ that_______.

A

codes are enforced by law

27
Q

​________ systems use water as a​ heat-transfer medium.

A

Hydronic

28
Q

To​ ________ a refrigerant means to circulate it through filtering devices to remove​ moisture, acid, and other​ contaminants, in the shop or in the field.

A

Recycle

29
Q

What temperature divides air conditioning applications from​ refrigeration?

A

60 degrees°F ​(16 degrees°​C)

30
Q

Cooling units that typically contain a​ compressor, condenser​ coil, condenser​ fan, and devices for compressor control and operation are called​ ________.

A

Condensing units

31
Q

Recovery is a process in which a refrigerant is​ _____.

A

removed and stored

32
Q

The expansion device in the mechanical refrigeration cycle​ _____.

A

lowers the refrigerant pressure entering the evaporator

33
Q

In a hydronic heating​ system, the heat exchange medium is​ _____.

A

water

34
Q

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?

A

Condenser

35
Q

To​ ________ a refrigerant means to remove it from a system and place it in containers approved for that purpose.

A

Recover

36
Q

A company must​ ________ any used refrigerant to meet the standards of purity required of new refrigerant before it can be resold.

A

Reclaim

37
Q

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.

A

Condenser

38
Q

To be resold to other​ customers, a refrigerant must have been​ _____.

A

reclaimed

39
Q

In a typical mechanical refrigeration​ system, heat is transferred from the indoor air to the refrigerant at the​ _____.

A

evaporator

40
Q

The equipment that is able to extract heat from the outside air by reversing the refrigeration cycle is called​ a(n) _____.

A

heat pump

41
Q

Before attempting to restart the burner when servicing an oil​ furnace, what can you do to avoid a possible​ explosion?

A

Allow accumulated oil to vaporize and leave the chamber.

42
Q

Units that can produce heat by reversing the mechanical refrigeration cycle are called​ ________.

A

Heat pumps

43
Q

A refrigerant metering device is commonly referred to as​ a(n) ________.

A

Expansion device

44
Q

What program identifies energy efficient products and​ designs?

A

ENERGY STAR

45
Q

Before starting work on a​ building, a contractor must apply for a​ ______.

A

permit

46
Q

A refrigerant compound that contains​ chlorine, fluorine, and carbon is called​ a(n) ________.

A

Chlorofluorocarbon (CFC)

47
Q

​________ describes the uncontrolled entry of outside air into a building or occupied space

A

Infiltration

48
Q

Which element of a mechanical refrigeration system creates the pressure differential necessary for refrigerant to​ flow?

A

Compressor

49
Q

The growth of bacteria and other harmful organisms can be reduced or eliminated by​ _____.

A

ultraviolet​ (UV) light

50
Q

The​ ________ results in heat being trapped below​ Earth’s atmosphere instead of allowing it to radiate into space.

A

Greenhouse effect

51
Q

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​ ________.

A

Mechanical refrigeration cycle

52
Q

Systems that use water or steam as the primary​ heat-exchange medium are known as​ _____.

A

hydronic

53
Q

Mandatory directives that regulate construction are called​ _____.

A

building codes

54
Q

An ERV uses cooled or heated air exiting the building to​ _____.

A

pre-condition fresh air being forced into the occupied space

55
Q

A refrigerant compound that contains​ hydrogen, chlorine,​ fluorine, and carbon is called​ a(n) ________.

A

Hydrochlorofluorocarbon (HCFC)

56
Q

In a common residential​ forced-air furnace, heat is transferred from the​ ________.

A

heat exchangers to the air

57
Q

A person who handles refrigerants must pass a written examination to become certified by which​ organization?

A

EPA

58
Q

A person must have EPA certification to​ _____.

A

buy or use refrigerant

59
Q

A funded performance​ guarantee, called​ a(n) ________, might have to be posted by a contractor to gain licensure.

A

Surety bond

Module One - Introduction to HVACR (5 decks)

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