Licensed Trades of America 410A Certification Exam

80% is required to pass--a maximum of 5 questions may be missed to achieve a passing score. You may close and reopen the exam to retake it if necessary--however, please be aware that closing the exam before submitting your results will cause your test data to be lost.

1. Which of the following is true of Polyolester (POE) lubricants?

Readily absorb moisture from the atmosphere
May cause skin irritation
Transfer heat better than mineral oils
All answers are correct

2. When charging an operating 410A system:

Charge witha vapor to avoid compressor damage
Charge with a liquid that is throttled into the low side of the system to avoid compressor damage
Charge with a vapor in order to speed up charging process
Charge with a liquid in order to speed up charging process

3. Gauge manifold set hoses must be rated to what?

900 psig
800 psig
700 psig
600 psig

4. Guage manifold sets for 410A require a range to what on the low side?

250 psig to a 550 psig retard
250 psig to a 660 psig retard
350 psig to a 550 psig retard
150 psig to a 550 psig retard

5. 407C has a high temperature glide.

True
False

6. Why are some 410A cylinders outfitted with a dip tube?

To allow VAPOR refrigerant th be removed with the cylinder UPRIGHT
To allow LIQUID refrigerant to be removed with the cylinder UPRIGHT
To allow VAPOR refrigerant to be removed from the cylinder INVERTED
To allow LIQUID refrigerant to be removed from the cylinder INVERTED

7. 407C is purely azeotropic and may not separate into its component refrigerants.

True
False

8. R22 service equipment may NOT be used on 410A systems.

True
False

9. Superheating to check for proper charge is recommended if charging:

A 410A system with a capillary tube or fixed metering device
A 407C system
A 410A system that used a thermostatic expansion valve
No answers are correct

10. The disposable cylinder color used for R410A is what?

Chocolate
Green
Yellow
Rose

11. Near azeotropic refrigerant blends:

Should be transferred from cylinders as a liquid to avoid fractionation
Should be tansferred from cylinders as a vapor to avoid fractionation
Have a high potential for fractionation
Have zero potential for fractionation

12. R410A may have which of the following trade names?

Suva 410A
AZ-20
Puron
All answers are correct

13. A purely azeotropic blend

1. Will not separate or fractionate
2. Has a high temperature glide
3. Acts as a single component refrigerant
4. Answers 1 & 3 are correct

14. Disposable cylinder color used for R407C is what?

Chocolate
Green
Yellow
Rose

15. Suction and discharge pressures of __________ systems are 40-70% higher than R-22.

All blended refrigerant
410A only
407C only
Both 410A and 407C

16. What is recommended for POE systems?

Use appropriate gloves and safety glasses when handling POE lubricants
Liquid and suction line filter driers to remove moisture
Use a pump to transfer lubricants
All answers are correct

17. When converting an R-22 system to 410A, the evaporator or indoor coil should be replaced with what?

One that meets the low service pressure ratings required by 410A
One that meets the high pressure service ratings required by 410A
One that has been approved by CNAP
No change out is required for the conversion

18. The discharge temperature of _________ is lower than R-22.

Both 410 and 407C
All blended refrigerant
407C only
410A only

19. 410A has a high temperature glide.

True
False

20. If a 410A system develops a leak, the remaining refrigerant in the system is:

Okay to use because of it's low fractional potential
Must be reclaimed because of it's high fractional potential
Is NOT okay to use because it is a blend of refrigerants, the components of which may leak at different rates
No answers are correct

21. Gauge manifold sets for 410A require a range up to what?

550 psig
600 psig
700 psig
800 psig

22. Which of the following is true of 407C?

It is a good choice for retrofitting an R-22 system
Somewhat similar pressures and temperatures as R-22
It is near azeotropic
All anwers are correct

23. Both 407C and 410A are _________-based and therefore do not deplete the __________.

Chlorine; Atmosphere
HFC; Ozone
Carbon; Ozone
CHFC; Atmosphere

24. Service Technicians must do what with Polyolester (POE) lubricants?

1. Store in plastic containers
2. Minimize lubricant's exposure to the atmosphere
3. Store in metal or glass containers
4. Answers 2 & 3 are correct

25. Subcooling to check for poper charge is recommended if charging:

A 410A system witha capillary tube or fixed metering device
An 407C system
A 410A system that uses a thermostatic expansion valve
No anwers are correct

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