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2 Safe Service of Low-Pressure Chillers Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Safe Service of Low-Pressure Chillers, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

True or false: A leak in a below-atmospheric section of a low-pressure chiller can draw air and moisture into the refrigerant circuit.

A
True
B
False

Choose one

1 point

A charged low-pressure chiller needs a leak check that requires raising system pressure. Which approach is generally preferred?

A
Pressurize the system with compressed air until the leak becomes audible.
B
Use controlled heating, following the applicable procedure and pressure limits.
C
Raise pressure without monitoring it, then inspect only the rupture disc.
D
Use nitrogen for every leak check, regardless of the applicable procedure.

Choose one

1 point

A technician is reviewing the function of a low-pressure chiller's purge unit. What does the unit remove from the system?

A
It removes liquid refrigerant to speed up recovery.
B
It prevents water-side tubes from freezing during evacuation.
C
It removes noncondensable gases from the system.
D
It measures whether a leak is located at a heat-exchanger tube.

Fill in the blank

1 point

When applicable, EPA Type III guidance calls for heating oil to about before removal to reduce refrigerant release from the oil.

Choose all

1 point

Select all actions that follow the material's safety guidance for preparing for service and responding to a suspected significant refrigerant leak.

A
Identify the refrigerant and review site emergency procedures before work.
B
Enter a space after a release to check whether it is safe before calling for help.
C
If an alarm sounds or a significant leak is suspected, leave, alert others, and follow the evacuation plan.
D
Attempt an unprotected rescue if someone may be in the affected area.

Choose one

1 point

When recovering refrigerant from a chiller, which sequence is recommended when liquid recovery is possible?

A
Recover liquid only; vapor recovery is unnecessary once the liquid is removed.
B
Recover liquid first when possible, then recover the remaining vapor.
C
Release the vapor before recovering the liquid.
D
Recover vapor first and leave liquid in the chiller for the repair.

True or false

1 point

True or false: During evacuation, excessive cooling can freeze water in a chiller's tubes and damage the heat exchanger.

A
True
B
False

Written response

1 point

For a suspected water-side tube leak, the manufacturer's procedure should guide isolation and inspection of which chiller component?

Fill in the blank

1 point

After reaching the required evacuation level, a pressure rise during the wait may indicate .

Written response

1 point

When an EPA evacuation level is required, what value in mm Hg absolute does the table specify for a low-pressure appliance?

Choose all

1 point

Select all actions that the material identifies as meeting a part of EPA's definition of a major repair.

A
Removing certain heat-exchange or compressor components.
B
Replacing a service label without opening the appliance.
C
Opening a sufficiently large flow area for more than 15 minutes.
D
Inspecting a gasket externally without opening the appliance.

Choose one

1 point

A technician is considering EPA's alternative procedure for opening a low-pressure appliance. Which situation matches the material's stated conditions for considering it?

A
For every repair, regardless of scope, open the appliance while it is under vacuum.
B
Use the alternative whenever the appliance has a purge unit, even if it will be evacuated to the atmosphere after service.
C
For a qualifying non-major repair when the appliance will not be evacuated to the atmosphere after service, follow the specified procedure to bring it to 0 psig before opening.
D
Bring the appliance to any pressure below its nameplate limit; no further conditions apply.

Open ended

1 point

A low-pressure chiller has unusually frequent purge operation and recurring moisture. Explain what these clues may indicate, why they are not enough to locate the leak, and how a technician should proceed to identify its location.

True or false

1 point

True or false: Unusually frequent or prolonged purge operation in a low-pressure chiller identifies the exact location of a leak.

A
True
B
False

Choose one

1 point

During evacuation of a chiller that contains water in its tubes, why should water be circulated or removed as directed by the manufacturer?

A
It helps locate refrigerant leaks in the water box.
B
It helps prevent water in the tubes from freezing and damaging the heat exchanger.
C
It ensures all refrigerant leaves the oil without heating.
D
It allows the system to be opened without checking recovery requirements.

Choose one

1 point

A low-pressure chiller’s purge unit begins operating unusually often. What is the most appropriate interpretation of this clue?

A
It proves that the leak is at the purge unit.
B
It confirms that refrigerant is escaping from an above-atmospheric section.
C
It can signal air infiltration, but does not identify the leak location.
D
It shows that the system has reached its required evacuation level.

Choose one

1 point

A technician needs to raise pressure on a charged low-pressure chiller for a leak check. Which approach follows the general guidance?

A
Use controlled heating, and stay within the chiller’s pressure limit.
B
Pressurize with nitrogen in every case, up to the pressure needed to find the leak.
C
Raise pressure until the purge unit stops operating.
D
Use any pressure that does not exceed the recovery cylinder’s rating.

Written response

1 point

When applicable, to about what temperature should oil be heated before removal to reduce refrigerant release from the oil? Enter the value in °F.

Written response

1 point

After a chiller reaches its required evacuation level, pressure rises during the wait-and-check period. Name either of the two possible causes identified in the service guidance.

Choose one

1 point

Which statement correctly describes using nitrogen to raise pressure during a leak check on a low-pressure chiller?

A
Nitrogen may always be used, provided the chiller is below atmospheric pressure.
B
Nitrogen may be used only when the applicable procedure allows it.
C
Nitrogen is required for every leak check on a low-pressure chiller.
D
Nitrogen may be used without regard to the chiller’s pressure limit.

2 Safe Service of Low-Pressure Chillers Online Quiz Questions

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