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

A) True
B) False

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

Correct Answer

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


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

E) C) and D)
F) B) and C)

Correct Answer

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

Correct Answer

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"Inches of water col...

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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

E) B) and C)
F) A) and D)

Correct Answer

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The orifice is a precisely sized hole in the ____.


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

E) A) and D)
F) B) and C)

Correct Answer

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

Correct Answer

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