Progress Test 1 Terms

Question 1

Annualized average efficiency of a fuel fired appliance, taking into account the effect of on-off operation.

Answer 1

AFUE (annual fuel utilization efficiency)

Question 2

The velocity at which a flame propagates through a flammable gas-air mixture

Answer 2

Burning Speed

Question 3

They have a sharp penetrating odor and can irritate the membranes of the nose and throat

Answer 3

Aldehydes

Question 4

The unit of measure of the volume rate of air flow

Answer 4

CFM (cubic feet per minute)

Question 5

Products of combustion plus excess air dilution air that passes through a vent

Answer 5

Flue Gas

Question 6

Air that enters a draft hood of a natural draft gas-fired furnace and mixes with the combustion products

Answer 6

Dilution Air

Question 7

Condition which exists when the flame of a combustion reaction comes into contact with a colder interior surface of the combustion chamber

Answer 7

Flame Impingement

Question 8

The rate at which a device can add heat to a substance, expressed in BTUs

Answer 8

Heating Capacity

Question 9

The minimum temperature at which a gas and air mixture will ignite

Answer 9

Ignition Temperature

Question 10

Those fuel gases that remain a liquid under pressure, including butane and propane

Answer 10

LP Gas (liquified petroleum)

Question 11

The approximate heating value of butane gas

Answer 11

3200 BTU/Cu. Ft.

Question 12

Small flame that is utilized to ignite the gas at the main burners

Answer 12

Pilot

Question 13

Combustion air that is mixed with the gas in a Bunsen-type burner before leaving the port

Answer 13

Primary Air

Question 14

Combustion air that mixes with the burning gas primary air mixture in the flame zone

Answer 14

Secondary Air

Question 15

Positive change in temperature of air passing through a heat exchanger as a result of heat transfer

Answer 15

Temperature Rise

Question 16

Device which keeps the pilot lit

Answer 16

Thermocouple

Question 17

Control device that opens or closes an electrical circuit in response to changes in temperature

Answer 17

Thermostat

Question 18

Ratio of the weight of a given volume of the gas to the weight of the same volume of standard air

Answer 18

Specific Gravity

Question 19

Approximate heating value of natural gas (methane)

Answer 19

995 BTU/Cu. Ft.

Question 20

Precision drilled hole in a spud that is issued to control the flow of gas to a burner

Answer 20

Orifice

Question 21

Rapid oxidation of fuel-gas accompanied by the production of heat, and or light

Answer 21

Combustion

Question 22

Scale used to measure gas pressure using a manometer

Answer 22

Inches Water Column

Question 23

Highly toxic gas that is odorless, colorless, has no taste, and will kill

Answer 23

Carbon Monoxide

Question 24

Added to fuel gases to help detect small leaks by smell

Answer 24

Odorants

Question 25

The amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit

Answer 25

BTU (British thermal unit)

Question 26

True or False. Excess air is required to assure that there will be more than enough oxygen present to prevent incomplete combustion. True or false

Answer 26

True. Excess air