Deck 31: Gas Heat

Question 1

Spark ignition is important for roof top or package units located outdoors because of ____________________ problems.

Answer 1

wind

Question 2

If flue gases are not vented properly, carbon monoxide poisoning could result.

Answer 2

True

Question 3

The horizontal furnace is positioned on its side, and it is usually installed in locations where it takes ____________________.

Answer 3

no floor space

Question 4

A furnace with a vertical air flow through the heat exchanger and the blower compartment beneath the heat exchanger is called a(n) ____.

A) upflow
B) downflow
C) low boy
D) horizontal

Question 5

The proper color of a gas flame is ____.

A) sharp all blue
B) lazy all blue
C) blue with slight orange tips
D) lazy with yellow tips

Question 6

The dangerous by-product of poor combustion of gas is _________________________.

Question 7

A gas furnace designed for use with natural gas can be used with liquified petroleum (LP) with no system modifications.

Question 8

Primary air adjusters on atmospheric type gas burners are usually ____.

A) butterfly shutters
B) sliding sleeves
C) spoiler screws
D) all of the above

Question 9

The orifice is a precisely sized hole in the ____.

A) manifold
B) spud
C) burner tube
D) combustion chamber

Question 10

Butterfly shutters and sliding sleeves are examples of _________________________ and are used on atmospheric type gas burners.

Question 11

Liquified petroleum (LP) is heavier than air and can cause suffocation if not handled properly.

Question 12

What is the difference between a yellow gas flame and an orange gas flame?

Question 13

The gas flame will lift off the burner and be noisy if it receives too much primary air.

Question 14

In the USA, natural gas suppliers supply gas with a heat content of about 1,050 Btu/cu. ft.

Question 15

Most gas furnaces and appliances use a(n) ____ burner.

A) compressed
B) hybrid
C) pressurized
D) atmospheric

Question 16

Why is "inches of water column" used to measure gas pressure instead of psig?

Question 17

A condensing gas furnace uses ____ from a condensing type heat exchanger to increase the furnace efficiency.

A) sensible heat
B) latent heat
C) superheat
D) subcooling

Question 18

Three products of complete combustion of natural and LP gas are carbon dioxide, water vapor, and _________________________.

Question 19

In a conventional gas furnace, the hot flue gases are ____.

A) forced out a PVC vent with a blower
B) recycled through a secondary heat exchanger and then vented through a draft diverter
C) forced through a type B vent by a blower
D) vented by natural convection

Question 20

Another name for a downflow heating unit is ____________________.

Question 21

The flame in a gas fired furnace is burning with heavy yellow tips. What is the problem?

Question 23

Why do propane and butane gas furnaces require 100% shut off in the event of pilot outage?

Question 24

On a gas furnace, what energizes the blower motor in the heat mode?

Question 25

When the burners ignite, the burner flame is normal until the blower starts. At this time, continuous roll out occurs. What is the problem?

Question 26

While the furnace is operating, heated air and flue products spill out of the burner compartment. What is the problem?

Question 27

When a gas furnace ignites and is under "full-fire," why does the fan not come on immediately?