ASF ASF Tools and Equipment Usage 2

Question 1

Which type of wrench is preferred when tightening refrigerant line flare fittings to avoid over-tightening?

Accepted Answer

Torque wrench

Answer

A torque wrench allows the technician to apply the manufacturer-specified torque to flare fittings, preventing leaks from under-tightening or cracked fittings from over-tightening.

Question 2

What does an electronic leak detector primarily sense when checking a refrigeration system?

Accepted Answer

Trace amounts of refrigerant gas in the air

Answer

An electronic leak detector uses a heated diode or infrared sensor to detect trace concentrations of refrigerant vapor escaping from fittings, joints, or coils.

Question 3

Which tool would a technician use to cut copper refrigerant tubing cleanly without creating metal shavings inside the line?

Accepted Answer

Pipe cutter (tubing cutter)

Answer

A tubing cutter uses a hardened wheel to score and shear copper tubing cleanly, minimizing burrs and keeping metal debris out of the refrigerant circuit.

Question 4

What is the purpose of a nitrogen purge when brazing refrigerant lines?

Accepted Answer

To prevent internal oxidation and scale formation inside the tubing

Answer

Flowing dry nitrogen through the tubing during brazing displaces oxygen, preventing copper oxide scale that could later contaminate compressor valves and metering devices.

Question 5

A micron gauge is used during refrigeration system service to verify what?

Accepted Answer

Depth of vacuum achieved

Answer

A micron gauge measures vacuum depth in microns of mercury, confirming the system has been evacuated deep enough (typically below 500 microns) to remove moisture and non-condensables.

(ASF) Appliance Service Fundamentals Certification Practice Test

(ASF) Appliance Service Fundamentals Certification Practice Test

ASF ASF Tools and Equipment Usage 2