G3 G3 - Gas Technician Level 3 Appliance Installation and Service Questions and Answers 2

Question 1

When servicing a gas burner with an intermittent pilot ignition (IPI) system, if the pilot fails to ignite, the technician should first check:

Accepted Answer

The spark igniter gap and electrode condition

Answer

The main burner orifice size

Answer

The flue size

Answer

The gas meter pressure

Question 2

What is the purpose of a thermocouple in a standing pilot gas appliance?

Accepted Answer

Generate a millivolt signal to hold the gas valve open when the pilot flame is present

Answer

Measure room temperature for the thermostat

Answer

Regulate gas pressure to the burner

Answer

Ignite the pilot automatically

Question 3

During annual service of a gas water heater, a technician notices a yellow-tipping flame. This most likely indicates:

Accepted Answer

Insufficient primary air causing incomplete combustion

Answer

Excess primary air

Answer

Correct air-to-gas ratio

Answer

High gas pressure

Question 4

A gas appliance heat exchanger should be inspected annually primarily to detect:

Accepted Answer

Cracks or holes that could allow combustion gases to mix with circulated air

Answer

Rust on the outer casing

Answer

Correct burner color

Answer

Thermostat calibration errors

Question 5

When replacing a gas valve on a furnace, the technician must verify the new valve:

Accepted Answer

Has the same inlet/outlet pressure ratings and voltage specifications as the original

Answer

Is painted the same color as the original

Answer

Is the least expensive available option

Answer

Has a longer warranty than the original

Question 6

After completing a gas appliance service call, the technician should always:

Accepted Answer

Perform a leak test on all disturbed connections using approved leak detection solution

Answer

Leave the gas supply off until the homeowner returns

Answer

Only test the main shutoff valve

Answer

Skip testing if the repair seemed straightforward