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Free Practice Quiz Question List

8 Type III: Low-Pressure Appliances Online Quiz Questions

Use this free practice quiz with 20 questions to review 8 Type III: Low-Pressure Appliances, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

A low-pressure chiller's purge unit separates and returns refrigerant from the purge stream while discharging noncondensable gases.

  1. A

    True

  2. B

    False

02
True or false
1 point

A leak in a section of a low-pressure chiller operating below atmospheric pressure will push air out of the system.

  1. A

    True

  2. B

    False

03
Choose one
1 point

Which condition identifies a low-pressure appliance for Type III certification?

  1. A

    Below 45 psia at 104°F

  2. B

    Below 45 psig at 104°F

  3. C

    Below 25 psia at 104°F

  4. D

    Below 45 psia at 100°F

04
Choose one
1 point

A technician is beginning recovery from a low-pressure chiller. Which sequence best speeds refrigerant removal while completing recovery?

  1. A

    Recover vapor first, then leave accessible liquid in the appliance.

  2. B

    Recover liquid only; removing visible liquid means the appliance is empty.

  3. C

    Recover liquid first, then recover the remaining vapor.

  4. D

    Open the appliance before recovery so the vapor can escape.

05
Choose one
1 point

A technician must raise pressure in a low-pressure chiller to search for a leak. Which approach is preferred?

  1. A

    Use controlled hot water or a built-in heating/pressurization device.

  2. B

    Raise pressure to the highest value the recovery equipment can produce.

  3. C

    Use nitrogen for every refrigerant and repair situation.

  4. D

    Open the appliance to atmospheric pressure before searching for leaks.

06
Written response
1 point

Before opening a Type III low-pressure appliance, what numerical absolute-pressure endpoint must it reach? Enter the value in mm Hg absolute.

07
Fill in the blank
1 point

To reduce the risk of freezing and damaging chiller tubes during evacuation, .

08
Choose all
1 point

For an appliance with a full charge of at least 50 pounds of ozone-depleting refrigerant, select all categories with a 10% annualized trigger leak rate under the Section 608 leak-repair rules.

  1. A

    Industrial process refrigeration: 30%

  2. B

    Commercial refrigeration: 20%

  3. C

    Comfort cooling: 10%

  4. D

    Other appliances: 10%

09
Choose all
1 point

A leak prevents a low-pressure appliance from reaching the required evacuation level. Select all actions consistent with the applicable requirements.

  1. A

    Isolate leaking components from non-leaking components where possible.

  2. B

    Evacuate non-leaking components to the required level.

  3. C

    Leave all components untreated if the leak prevents full evacuation.

  4. D

    Recover from leaking components to the lowest attainable pressure, no higher than 0 psig.

10
Written response
1 point

When changing oil in a low-pressure appliance, what is the highest pressure permitted for the appliance or isolated section? Enter the value in psig.

11
Fill in the blank
1 point

Under the Section 608 rules described here, an appliance containing at least 50 pounds of ozone-depleting refrigerant that leaks 125% or more of its full charge in a calendar year is subject to .

12
Open ended
1 point

A technician is preparing to open a low-pressure appliance for a non-major repair, and the appliance will not be evacuated to the atmosphere after the repair. Explain the pressure condition required before opening and how the permitted pressure-raising method depends on the refrigerant's normal boiling point.

13
Choose one
1 point

Which situation meets the stated definition of a major repair for a low-pressure appliance?

  1. A

    Any repair that requires adding refrigerant.

  2. B

    Removal of a listed major component, or an opening of more than 4 square inches of flow area left uncovered for more than 15 minutes.

  3. C

    Any repair performed while the appliance is under vacuum.

  4. D

    Any repair that takes more than 15 minutes, regardless of the size of the opening.

14
Choose one
1 point

When recovering refrigerant from a low-pressure chiller, which sequence best speeds refrigerant removal while ensuring the remaining refrigerant is recovered?

  1. A

    Recover vapor first and leave accessible liquid until the end.

  2. B

    Recover accessible liquid first, then recover the remaining vapor.

  3. C

    Open the appliance after recovering liquid, without recovering vapor.

  4. D

    Recover liquid only if the appliance is above atmospheric pressure.

15
Choose one
1 point

A technician is evacuating a low-pressure chiller. Which action helps protect the chiller tubes during evacuation?

  1. A

    Circulate or remove the water as appropriate to reduce the risk of freezing.

  2. B

    Add water to the chiller so it can absorb refrigerant vapor.

  3. C

    Keep the water stationary because circulation increases freezing risk.

  4. D

    Drain the water only after opening the appliance to the atmosphere.

16
True or false
1 point

True or false: An opening with more than 4 square inches of flow area that is left uncovered for 16 minutes qualifies as a major repair.

  1. A

    True

  2. B

    False

17
Choose one
1 point

After a low-pressure appliance reaches its required evacuation endpoint, the technician waits a few minutes and observes a pressure rebound. What should the technician conclude and do?

  1. A

    Open the appliance immediately because the evacuation endpoint has been reached.

  2. B

    Assume the pressure rise is normal and stop recovery.

  3. C

    Continue recovery as needed because refrigerant may remain or be coming out of oil.

  4. D

    Add nitrogen until the pressure returns to its original level.

18
Choose one
1 point

Before removing oil from a low-pressure appliance, what preparation helps reduce the amount of refrigerant dissolved in the oil?

  1. A

    Cool the oil below 85°F to release refrigerant safely.

  2. B

    Heat the oil to about 130°F to reduce dissolved refrigerant.

  3. C

    Add nitrogen directly to the oil before draining it.

  4. D

    Heat the oil until the appliance reaches atmospheric pressure.

19
Written response
1 point

To what absolute pressure must a low-pressure appliance be evacuated before it is opened? Enter the value in mm Hg absolute.

20
Written response
1 point

Under the Section 608 leak-repair rules described here, what annual leak-rate threshold applies to a qualifying comfort-cooling appliance with a full charge of at least 50 pounds of ozone-depleting refrigerant? Enter the percentage.