Question 1

Two methods of igniting the main burner exist today.

Accepted Answer

There are more than two methods for igniting the main burner, including pilot lights, electronic ignition, and hot surface ignition, among others.

Question 2

A &#34;flame rod&#34; senses the presence of a gas flame by using ionized particles in the flame as a ____.&#10;A) conductor&#10;B) resistor&#10;C) regulator&#10;D) extinguisher

Accepted Answer

A flame rod works by using the ionized particles in the flame as a conductor to complete a circuit, allowing the flame sensing control module to know that a flame is present.

Question 3

Many of the newer gas-operated appliances and heating systems use a(n) ____ to ignite the gas flame.&#10;A) thermocouple&#10;B) electric arc&#10;C) fire eye&#10;D) pilot light

Accepted Answer

Electric arcs are commonly used in modern gas-operated appliances and heating systems to ignite the gas flame, as they provide a reliable and immediate source of ignition without the need for a constantly burning pilot light.

Question 4

In a pressure type of flame sensor, a ____-filled bulb is located in the pilot flame.&#10;A) solvent&#10;B) mercury&#10;C) refrigerant&#10;D) solution

Accepted Answer

In a pressure type of flame sensor, a refrigerant-filled bulb is used to detect the presence of a pilot flame.

Question 5

The &#34;fire eye&#34;gas flame sensor detects the heat of a flame.

Accepted Answer

The "fire eye" gas flame sensor detects the presence of a flame using ultraviolet or infrared light, not heat.

Question 6

The ultraviolet radiation of the gas flame causes the gas in the fire eye to ____ and conduct electricity.&#10;A) ionize&#10;B) fuse&#10;C) synthesize&#10;D) deactivate

Accepted Answer

Ultraviolet radiation can cause the gas molecules in the fire eye to lose an electron and become ionized, creating positively charged ions and free electrons that can conduct electricity.

Question 7

The thermocouple can produce enough current to reopen the valve if it is closed.

Accepted Answer

A thermocouple generates a small voltage in response to temperature differences, not enough current to actuate or reopen valves; it is primarily used for temperature measurement or as a safety device in gas appliances to ensure the gas valve remains closed if the pilot light is out.

Question 8

Gas control valves direct the flow of gas to the main burner and the pilot light, if used.

Accepted Answer

Gas control valves are responsible for directing the flow of gas to both the main burner and the pilot light, if present.

Question 9

Probably the oldest method of automatically igniting a main burner is with a pilot light.

Accepted Answer

Pilot lights have been used for many years to ignite the main burner in gas appliances such as ovens, water heaters and furnaces. The pilot light is a small flame that burns continuously and is used to ignite the gas when the burner is turned on. However, newer appliances often use electronic ignition systems instead of pilot lights.

Question 10

The thermocouple is a device that produces a ____ when heated.&#10;A) current&#10;B) spark&#10;C) spike&#10;D) voltage

Accepted Answer

A thermocouple produces a voltage when heated.

Deck 38: Gas Burner Controls