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Hvac > Section 2 unit 9 Refrigeration And Oil Chemistry > Flashcards

Section 2 unit 9 Refrigeration And Oil Chemistry Flashcards

1
Q

Ozone is a type of

A

Oxygen

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2
Q

Depletion of the earth’s ozone shield will __________
-the sun’s ultraviolet rays on the
earth’s surface

A

Increase

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3
Q

__________ reacts with the

earth’s stratospheric ozone layer

A

Carbon

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4
Q

(CFCs) means

A

Chlorofluorocarbons

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5
Q

Chlorofluorocarbons abbreviations is

A

CFC

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6
Q

(HCFCs) means

A

Hydrochlorofluorocarbons

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7
Q

Hydrochlorofluorocarbons abbreviations is

A

HCFC

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8
Q

(HFCs) means

A

Hydrofluorocarbons

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9
Q

Hydrofluorocarbons abbreviations is

A

HFC

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10
Q

(HCs) means

A

Hydrocarbons

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11
Q

Hydrocarbons abbreviations is

A

HC

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12
Q

(HFOs) means

A

Hydrofluoro-olefins

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13
Q

Hydrofluoro-olefins abbreviations is

A

HFO

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14
Q

The refrigerant R-11 is a(n)

A

CFC. Chlorofluorocarbons

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15
Q

The refrigerant R-22 is a n)

A

Hydrofluorocarbons (HFCs)

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16
Q

When refrigerant is removed from a system, it

must be

A

Recovered

17
Q

Before a refrigerant that has been removed from a
system can be sold to another customer, it must be
processed to the

A

ODP 720. Ozone depletion process

18
Q

Cylinders used in the recovery of refrigerant must

be approved by the

A

environmental protective agency EPA

19
Q

A micron is a measurement of a level of

A

positive pressure

20
Q

The number-one contributor to global warming

A

carbon dioxide, CO

21
Q

true or false. most refrigerants are heavier than air

A

True

22
Q

The refrigerants that are thought to be the most
damaging to the earth stratospheric ozone layer
are the

A

Chlorofluorocarbons (CFCs)

23
Q

The azeotropic mixture refrigerants are

A

R-500 and R-502.

24
Q

True or false. Does the near-azeotropic refrigerant blends experience temperature glides

A

True

25
Q

True or false. The correct refrigerant oils must be chosen for all
refrigerants.

A

True

26
Q

The refrigerant blends R-404A and R-410A are

A

Hydrofluorocarbons (HFCs)

27
Q

Propane, Butane, Isobutane, Isopentane, Methane, Ethane R-44 are all what refrigerant

A

Hydrocarbons (HCs)

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