Core

Question 1

Which of the following refrigerants has the lowest global warming potential

Answer 1

R-600a

Question 2

Which of the following gases is used as the baseline measurement for global warming potential

Answer 2

Carbon dioxide

Question 3

Which type of refrigerant typically has the lowest global warming potential

Answer 3

HFOs

Question 4

Why are HFO refrigerants less flammable hydrocarbon refrigerants

Answer 4

They contain fluorine

Question 5

Which of the following refrigerants is an HFO

Answer 5

R-1234yf

Question 6

Which of the following refrigerants have an ozone depletion potential of more than zero

Answer 6

R-134a and R-410a

Question 7

Which of the following is an HFC refrigerant

Answer 7

R-134a

Question 8

What is one of the most serious result of damage to the stratospheric ozone layer

Answer 8

Increased rates of skin cancer in humans

Question 9

What is the strongest evidence that HCFCs are in the stratosphere

Answer 9

Measurement of chlorine and air samples from the lower atmosphere

Question 10

Distributors must verify which of the following before they can sell HFC or HCFC refrigerant

Answer 10

The purchaser is or employees a section 608 certified technician

Question 11

After the phase out of a refrigerant where will supplies of that refrigerant for equipment servicing come from

Answer 11

Recovery and reclaimed gas

Question 12

Which one of the following is a lawful use of HCFC 22

Answer 12

Servicing existing R-22 Systems

Question 13

When do EPA’s refrigerant management regulations exempt refrigerant from the venting prohibition

Answer 13

When the epa has determined that the refrigerant in that type of appliance does not pose a threat to the environment if released

Question 14

Which of the following refrigerant releases is considered a violation of the prohibition on venting

Answer 14

Release of mixtures of nitrogen and refrigerant that result from adding nitrogen to a fully charged appliance to leak check the appliance

Question 15

Which of the following is a low-pressure refrigerant under EPA’s refrigerant recycling regulations

Answer 15

R-123

Question 16

The term retrofit refers to a change to the appliance in order to do what

Answer 16

Convert it to use a different refrigerant

Question 17

Which of the following releases of a refrigerant is illegal

Answer 17

Venting refrigerant from a recovery machine or recovery cylinder

Question 18

In what state does the refrigerant enter the metering or expansion device of a refrigeration system

Answer 18

Liquid

Question 19

Which word applies to the process that returns refrigerant to new product specifications and that requires chemical analysis

Answer 19

Reclaim

Question 20

Which of the following leak detection methods is considered to be the most effective for locating the general area of a small leak

Answer 20

Electronic or ultrasonic tester

Question 21

What should a technician do if they discover that some R-410a was added to an R-22 System

Answer 21

Recover the mixture in a separate recovery tank

Question 22

When is a system considered dehydrated

Answer 22

The vacuum indicator shows you had reached and held a vacuum of 500 microns or less

Question 23

Why should refrigerant vapor or missed in high concentrations not be inhaled

Answer 23

They may cause heart irregularities or unconsciousness

Question 24

Why must containers designated refillable by DOT be used for transporting recovered pressurized refrigerant

Answer 24

To meet safety requirements

Question 25

Although the saturation pressure temperature behavior of two refrigerant might be similar of all the following characteristics of the refrigerant being compared what must also be considered

Answer 25

Latent heat of evaporation