Intro refrigeration Test 3 (week 11)

The willful purging or venting of certain refrigerants to the atmosphere is

• encouraged by the EPA as it helps to protect tropospheric ozone.

• desirable as this process helps improve food preservation efforts.

• illegal as set forth by EPA regulations.

• essential to the preservation of the stratospheric ozone layer.

What is the difference between an oxygen molecule and an ozone molecule?

• An oxygen molecule has two oxygen atoms, while an ozone molecule has one.

• An oxygen molecule has one oxygen atom, while an ozone molecule has two.

• An oxygen molecule has three oxygen atoms, while an ozone molecule has two.

• An oxygen molecule has two oxygen atoms, while an ozone molecule has three.

Tags

NGSS.MS-PS1-1

It is estimated that a single chlorine atom can destroy up to ______ ozone molecules.

• 1000

• 10,000

• 100,000

• 1,000,000

Which of the following sets of refrigerant classifications has a zero ODP?

• CFCs and HFOs

• CFCs and HFCs

• HCFCs and HFCs

• HFOs and HFCs

CFCs are more harmful to the stratospheric ozone layer than HFCs because CFCs contain

• hydrogen.

• carbon.

• chlorine.

• fluorine.

Tags

NGSS.HS-PS1-2

HFO refrigerants are classified as having

• low GWPs and high ODPs.

• low GWPs and low ODPs.

• high GWPs and low ODPs.

• high GWPs and high ODPs.

The total phaseout for all HCFC refrigerants is scheduled for the year

• 2035

• 2025

• 2040

• 2030

Which of the following classes of refrigerants is potentially dangerous because of its high flammability?

• HCFC

• CFC

• HC

• HFO

Of the following refrigerants, which is best suited as a retrofit refrigerant for an R-22 residential air-conditioning system?

• R-134a

• R-407C

• R-123

• R-410A

Tags

NGSS.HS-ETS1-3

NGSS.HS-ESS3-4

Refrigerants R-11, R-12, and R-22 all have what in common?

• They are all methane-based refrigerants.

• They are all CFC refrigerants.

• They are all HCFC refrigerants.

• They are all ethane-based refrigerants.