EPA Type III New Quiz

1. A typical setting for the high pressure cut-out control on a recovery unit used for evacuating the refrigerant from a low pressure chiller is:

• A) 2 psig.

• B) 5 psig.

• C) 10 psig.

• D) 15 psig.

2. A charged low pressure refrigeration system can be efficiently leak checked by:

• A) adding compressed air, since it will be removed from the system by the Purging unit.

• B) operating the purge system.

• C) adding HCFC-22.

• D) raising system pressure by heating with circulated hot water or heating blankets.

3. The existence of air in a low pressure system, causes __________.

• A) low head pressure.

• B) low suction pressure.

• C) high head pressure.

• D) high liquid level.

4. Which safety precaution should be adhered to for low pressure systems?

• A) Do not siphon refrigerant by mouth.

• B) Avoid spilling liquid refrigerant on the skin.

• C) Use gloves and safety goggles when working with liquid refrigerant.

• D) all of the above

5. Refrigerant-11 at 14.7 PSIA will boil at about:

• A) 60.3F.

• B) 74.5F.

• C) 79.7F.

• D) 80.2F.

6. When there is excessive moisture collecting in the purge unit of a low pressure refrigeration system, this indicates that the __________.

• A) the system was charged with contaminated refrigerant.

• B) the condenser or chiller barrel tubes are leaking.

• C) the purge unit is not operating properly.

• D) the purge unit needs adjustment.

7. ASHRAE Standard 15 - 1994 requires equipment room refrigerant sensors for what safety group classification? A) A1 B) B2 C) A2 D) All refrigerant safety groups

• A) A1

• B) B2

• C) A2

• D) All refrigerant safety groups

8. When recharging a refrigeration system with R-11, what vapor pressure is necessary in the shells before charging with liquid?

• A) 21.1" Hg vacuum

• B) 19.7" Hg vacuum

• C) 18.1" Hg vacuum

• D) 16.9" Hg vacuum

9. After reaching the required recovery vacuum on a chiller, you should:

• A) Immediately disconnect the recycling or recovery equipment and open the system for service.

• B) Wait for at least a few minutes to see if the system pressure rises, indicating that there is still refrigerant in liquid form or in the oil.

• C) Immediately break the vacuum with nitrogen and open the system for service.

• D) Immediately pressurize the system with nitrogen and perform a leak check.

10. A hydrostatic tube test kit is used to:

• A) blow all water from the tubes.

• . B) remove any water from the machine.

• C) vent refrigerant.

• D) determine if a tube leaks.