HVAC (Gas Heat) Master Test Exam Questions with Correct Answers
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The division of air into primary and secondary types is a matter of which of the following - Answer-Pressure of gas available, burner design, type of flame desired (all of them)
In the air stream leaving direct gas fired units, concentrations of carbon monoxide as per ANSI shall not be more than...
the division of air into primary and secondary typ
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HVAC (Gas Heat) Master Test Exam
Questions with Correct Answers
The division of air into primary and secondary types is a matter of which of the following
- Answer-Pressure of gas available, burner design, type of flame desired (all of them)
In the air stream leaving direct gas fired units, concentrations of carbon monoxide as
per ANSI shall not be more than __________ - Answer-5 PPM
Gas Burners approved by the ________ should be used in a heating system - Answer-
AGA
Current Flow - Answer-The flow of electrons
Impedance - Answer-Opposition of current flow
Conducter - Answer-Material that will readily release electrons
Symbol for current - Answer-I
The Primary air is admitted at a ratio of about __________ parts primary air to 1 part
gas, for manufactured gas - Answer-5
An __________ is characterized by a burner tube that extends horizontally from the unit
and then bends to assume a vertical position - Answer-Upshot gas burner
What cannot be carried out to identify leaks in gas piping - Answer-Flame Test
The Bunsen burner flame is __________ in color - Answer-Bluish
No more than _______ of Carbon monoxide is allowed in furnace flue gases air
measurement - Answer-400 ppm
Natural gas has a heating value of approximately ________ Btu per cubic foot -
Answer-1000
Joint Compound in gas piping is applied sparingly to the threads only - Answer-male
LPG has a specific gravity of _____ - Answer-1.5
Too much ________________ causes the flame to lift off the burner ports - Answer-
Primary Air
_______________ is regulated by means of an adjustable shutter - Answer-Primary Air
, ________________ will also control back-drafts that tend to extinguish the gas burner
flame and the amount of excess air. - Answer-Draft Hood
Which of the following fuel is used Direct Gas-Fired Heating Systems - Answer-Natural
Gas
The maximum allowable concentration of continuous 24hr exposure of Carbon
monoxide according to ASHRAE is about ___________ - Answer-0.009 ppm
When burning natural gas, the air adjustment is generally made to secure as
__________ a flame as possible - Answer-Blue
___________ on pipes and pipe fittings should be located by spreading a soap solution
over the surface - Answer-Gas Leaks
Which of the following gas is the main constituent in Natural gas - Answer-Methane
A yellow flame indicates dependence entirely on ______ air for combustion - Answer-
Secondary
The primary air is admitted at a ratio of about _______ parts primary air to 1 part gas for
natural gas - Answer-10
During incomplete combustion which of the following is produced - Answer-CO
Propane is ______ than air - Answer-Heavier
Natural gas has a specific gravity of _____ - Answer-0.6
Which fittings should NOT be used for the main gas line - Answer-Aluminum tubing
OSHA standards prohibit worker exposure to Carbon monoxide not more than _____
PPM air averaged during an 8 hour period - Answer-50
Install the main manual gas shutoff valve on the riser at least _______ above the floor
level - Answer-4 ft
The Bunsen burner flame is practically _________ - Answer-Nonluminous
The burner tube of an ________ is commonly a straight, adjustable venturi that extends
horizontally from the unit - Answer-Inshot Gas Burner
A ___________ is used to ensure the maintenance of constant lowdraft conditions in
the combustion chamber with a resultant stability of air supply - Answer-Draft Hood
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