Core

Question 1

What is the significance of an azeotropic mixture?

Answer 1

The mixture combines to act like a single-component refrigerant.

Question 2

CFCs are more likely to reach the stratosphere than other chlorine-containing compounds because _____.

Answer 2

They are chemically stable.

1) They do not dissolve or breakdown in water.
2) They are heavier than air.
3) Typically NOT toxic
4) They do not decompose.

Question 3

Chlorofluorocarbons, or CFCs, consist of which of the following chemicals?

Answer 3

Chlorine, fluorine, carbon

Question 4

Which compounds are the most damaging of the ozone layer and have the highest ozone depletion potential rating?

Answer 4

CFCs

Question 5

_________ tests methods are assumed by the EPA as the most effective methods for locating the general area of SMALL LEAKS.

Answer 5

Electronic and Ultrasonic

Question 6

If a reclamation company is shipping a cylinder contains mixed refrigerants they may _________.

Answer 6

Agree to destroy the refrigerant but typically a substantial fee is charged.

Question 7

One chlorine atom in the stratosphere is capable of destroying how many ozone molecules?

Answer 7

100,000 ozone molecules.

Question 8

______ is s CFC.

Answer 8

R-502

R-141b & R-123 are HCFCs

R-134a is a HFC.

Question 9

HCFC refrigerants cause ________ damage to the stratospheric ozone layer in comparison to CFC refrigerants.

Answer 9

Less

1) HCFCs contain hydrogen, making it chemically less stable than CFCs.
2) HCFCs decompose faster, causing very little to make it to the ozone layer.

Question 10

The system vacuum gauge should be connected _______.

Answer 10

As far as possible from the vacuum pump.

1) This assists in getting the most accurate reading from the vacuum pump.

Question 11

Manufacture of CFCs was banned as of December 31, ________.

Answer 11

1995

1) Supplies of CFC refrigerants for servicing and only come from recovery, recycling and reclamation.

Question 12

Positive evidence that CFCs are in the stratosphere comes from _______.

Answer 12

Measurements of CFCs in air samples taken from the stratosphere

Question 13

Under EPAs regulations, reclaimed refrigerant must meet _______ standards for purity before it can be resold.

Answer 13

ARI 700

Question 14

_________ recovery devices are so named because they depend on components of the system. That is, they capture refrigerant with the assistance of components in the air conditioning or refrigeration equipment they are emptying.

Answer 14

System-dependent or passive-recovery devices

Question 15

All devices used for refrigerant recovery must meet _____ standards.

Answer 15

EPA

Question 16

List one HCFC refrigerant:

Answer 16

R-22

R-134a is a HFC

R-12 and R-113 are CFCs

Question 17

Which refrigerant contain no chlorine?

Answer 17

HFCs

Question 18

Which refrigerant is an HFC?

Answer 18

R-134a

R-123 & R-22 are HCFCs

R-11 is a CFC

Question 19

Ozone in the stratosphere consists of molecules containing ______ oxygen atom(s).

Answer 19

3

Question 20

________ in refrigerant causes ozone depletion.

Answer 20

Chlorine and Bromine

Question 21

Recovery devices that can capture liquid and/or vapor refrigerant without the assistance of components in the air conditioning or refrigeration equipment are known as _______.

Answer 21

Self-contained or active recovery devices

Question 22

Technicians are certified to recover refrigerant during the maintenance, service, or repair of packaged A/C or refrigeration equipment with five pounds or less of refrigerant if they receive a passing grade on ______ examinations.

Answer 22

Type I

Question 23

Technicians are certified to recover refrigerant during the maintenance, service, or repair of high-pressure equipment if they receive a passing grade on ______ examinations.

Answer 23

Type II
High-pressure certification

Such as:
High-pressure CFC-12, HCFC-22, CFC-500, CFC-502, CFC-114
Very high-pressure CFC-13 & CFC-502

Question 24

Technicians are certified to recover refrigerant during the maintenance, service, or repair of low-pressure equipment if they receive a passing grade on ______ examinations.

Answer 24

Type III
Low-pressure certification

Such as:
CFC-11, CFC-123

Question 25

________ refrigerants leak at uneven rates due to the differences in the vapor pressures.

Answer 25

Blended

Non-azeotropic must be charged as a liquid.