GPT Tools & Equipment Operation 4

Question 1

What is the purpose of a manometer during gas appliance commissioning?

Accepted Answer

Measuring gas supply and manifold pressures precisely

Answer

Testing pipe joints for leaks with soapy water

Answer

Detecting carbon monoxide in flue gases

Answer

Verifying that the gas valve is fully open

Question 2

When a technician uses a flaring tool on copper tubing for a gas connection, what must be done BEFORE flaring?

Accepted Answer

Slide the fitting nut onto the tubing

Answer

Apply pipe dope to the tubing end

Answer

Anneal (soften) the copper with a torch

Answer

Ream and deburr the cut end only

Question 3

Which detection method is preferred for locating underground gas pipe before excavation?

Accepted Answer

Electronic line locator (pipe/cable locator)

Answer

Visual surface inspection for pipe markers

Answer

Digging test holes every 10 feet

Answer

Acoustic listening device for gas flow noise

Question 4

A pressure test gauge shows an initial reading of 10 psig on a new gas piping system. After 15 minutes, the gauge reads 9.5 psig. What does this indicate?

Accepted Answer

A leak exists somewhere in the system

Answer

Normal thermal contraction of the pipe

Answer

The gauge is defective and needs calibration

Answer

Acceptable pressure drop within code tolerance

Question 5

What is the correct technique for applying PTFE (Teflon) tape to a male NPT gas pipe thread?

Accepted Answer

Wrap clockwise, leaving the first thread exposed

Answer

Wrap clockwise (in the direction of thread engagement) starting at the first thread

Answer

Wrap counterclockwise starting at the pipe end, covering 4–5 threads

Answer

Apply two layers in both directions for maximum seal

Question 6

Which tool is used to confirm that gas piping is electrically bonded and grounded correctly?

Accepted Answer

Milliohm/continuity meter (ohmmeter)

Answer

Non-contact voltage tester

Answer

Clamp-style ammeter

Answer

Megohmmeter (insulation tester)

Question 7

What is the safe practice when regulator outlet pressure must be adjusted in the field?

Accepted Answer

Shut off all downstream appliances, adjust, then relight in sequence

Answer

Adjust while downstream appliances are operating at full load

Answer

Increase pressure rapidly to purge any air from lines

Answer

Use a screwdriver to bypass the regulator spring tension screw