GPT System Inspection & Maintenance 5

Question 1

A technician is performing an annual inspection and finds a gas appliance with a yellow or orange flame instead of the expected blue flame. What does this indicate?

Accepted Answer

Incomplete combustion, likely from insufficient air supply or dirty burner

Answer

The appliance is operating at peak efficiency

Answer

The gas pressure is too high

Answer

The thermocouple is failing

Question 2

What is the purpose of a tracer wire installed alongside a non-metallic gas pipe underground?

Accepted Answer

To enable electronic locating of the non-metallic pipe from the surface

Answer

To provide a ground path for lightning strikes

Answer

To reinforce the pipe against soil movement

Answer

To carry low-voltage monitoring signals

Question 3

When inspecting a gas regulator vent line, a technician finds the vent is obstructed by a wasp nest. What is the correct action?

Accepted Answer

Clear the obstruction and install a screened vent cap to prevent recurrence

Answer

Leave it in place and schedule removal for next season

Answer

Plug the vent opening permanently since it rarely needs to vent

Answer

Increase regulator setpoint to compensate for back-pressure

Question 4

A pressure test on a newly maintained section of gas piping holds for 10 minutes but drops slightly in the last 2 minutes. What should the technician do?

Accepted Answer

Investigate for leaks; even a slight drop indicates the system is not leak-free

Answer

Accept the test as passing since most of it held

Answer

Attribute the drop to temperature change and pass the test

Answer

Re-pressurize and begin the 10-minute timer again

Question 5

When decommissioning a gas appliance, what must be done with the open gas supply stub that remains?

Accepted Answer

Cap or plug it with an approved gas-tight fitting

Answer

Leave it open and tag it for future use

Answer

Insert a rubber stopper as a temporary measure

Answer

Tie a knot in a flexible connector to seal it

Question 6

What does the term 'over-pressurization' refer to in a gas distribution system, and what component is the primary defense against it?

Accepted Answer

Pressure exceeding safe system limits; a pressure relief valve or regulator is the primary defense

Answer

Gas flowing in reverse; a check valve prevents it

Answer

Excess gas velocity causing erosion; a flow limiter prevents it

Answer

Low pressure at the appliance; a booster pump compensates

Question 7

Which record-keeping requirement applies after completing a gas system inspection and any subsequent repairs?

Accepted Answer

A written inspection report must be completed, signed, and retained per applicable codes

Answer

No documentation is required for routine maintenance

Answer

Only failed tests need to be documented

Answer

Documentation is only required if the utility company requests it