HVAC HVAC Tools and Equipment 2

Question 1

A clamp meter (clamp-on ammeter) measures current by detecting what around a conductor?

Accepted Answer

Magnetic field

Answer

A clamp meter senses the magnetic field produced by current flowing through a conductor, allowing non-contact amperage measurement.

Question 2

Which tool is specifically designed to detect refrigerant leaks in an HVAC system?

Accepted Answer

Electronic leak detector

Answer

An electronic leak detector uses a heated sensor or infrared technology to detect halogenated refrigerant molecules at very low concentrations.

Question 3

What does a digital manifold gauge set provide that an analog set does not?

Accepted Answer

Superheat and subcooling calculations

Answer

Digital manifold sets calculate superheat and subcooling automatically when connected to temperature clamps, eliminating manual chart lookups.

Question 4

Which tool is used to cut copper refrigerant tubing cleanly without leaving burrs that could damage a compressor?

Accepted Answer

Tubing cutter

Answer

A tubing cutter uses a hardened wheel to score and cut copper tubing squarely; the reamer attachment then removes the interior burr.

Question 5

A nitrogen tank and regulator are used during HVAC installation primarily to:

Accepted Answer

Pressure test and purge the refrigerant circuit before brazing

Answer

Dry nitrogen is used to pressure-test lines for leaks and to flow through copper tubing during brazing to prevent oxidation scale inside.

HVAC Practice Test