CDC 3E151 - HVAC/R JOURNEYMAN VOLUME 4 EXAM QUESTIONS
WITH COMPLETE SOLUTIONS VERIFIED GRADED A+
(601) How is static electricity best controlled?
Grounding, bonding, humidifying
(601) Grounded wires carrying off static charges
neutralizes the difference in electrical potential
(601) A fuel spill should be reported when how many gallons or more is leaked or
spilled?
25
(601) A leak of 35 gallons should be reported to the state regulator within
24 hours
(602) When the viscosity of an oil is decreased, how does it affect the oil?
Easier to pump
(602) Which type of condition could cause a blocked burner?
Sludge in oil
(603) Which procedure is best to use for efficiency if the tank is below the level of
the burner?
A two-stage pump with a two-pipe system
(603) Why is a galvanized pipe not used with fuel lines?
It can cause corrosion problems
(603) Why is a gate valve located on the tank side of the strainer?
So that the suction line is isolated when cleaning the strainer
(604) Liquefied petroleum gas (LPG) is stored and transported in
it liquid state
(604) Ten percent of a liquefied petroleum gas (LPG) tank is not filled to
accommodate for expansion
, (605) The action that happens to the safety shutoff valve in the main burner line
once a pilot flame is detected is it
is opened
(605) Which device removes any accumulated gas in the combustion chamber
burner?
Blower
(606) What are the three categories of gas supply systems?
Low, medium, and high
(607) Identify what you would use to determine if water is in the oil
Tank stick with water finding paste
(608) Identify all necessary elements that must be present for combustion?
Heat, air, and fuel
(608) How much of the flue gases are made up of nitrogen?
79%
(608) Why is carbon monoxide undesirable in flue gases, besides the fact that it is
dangerous?
Its presence in flue gases represents a waste of fuel
(608) The turndown of a burner is the ratio of the
maximum firing rate to the minimum firing rate
(609) Identify the relationship between excess air and complete combustion
Excess air is needed for complete combustion
(609) The condition that affects infiltration losses is the volume of
outside air that leaks through cracks and crevices
(610) A pressure-gun burner achieve flame turbulence by
causing the air to whirl as it leaves the gun tube
(611) The effect too much air has on a flame is that it makes it
short, noisy, and tends to pull away from the burner
(611) Identify the cause of a high CO2 reading during combustion
Insufficient draft and over firing
(612) Where does the signal to open and close a gas valve come from on modern
equipment?
WITH COMPLETE SOLUTIONS VERIFIED GRADED A+
(601) How is static electricity best controlled?
Grounding, bonding, humidifying
(601) Grounded wires carrying off static charges
neutralizes the difference in electrical potential
(601) A fuel spill should be reported when how many gallons or more is leaked or
spilled?
25
(601) A leak of 35 gallons should be reported to the state regulator within
24 hours
(602) When the viscosity of an oil is decreased, how does it affect the oil?
Easier to pump
(602) Which type of condition could cause a blocked burner?
Sludge in oil
(603) Which procedure is best to use for efficiency if the tank is below the level of
the burner?
A two-stage pump with a two-pipe system
(603) Why is a galvanized pipe not used with fuel lines?
It can cause corrosion problems
(603) Why is a gate valve located on the tank side of the strainer?
So that the suction line is isolated when cleaning the strainer
(604) Liquefied petroleum gas (LPG) is stored and transported in
it liquid state
(604) Ten percent of a liquefied petroleum gas (LPG) tank is not filled to
accommodate for expansion
, (605) The action that happens to the safety shutoff valve in the main burner line
once a pilot flame is detected is it
is opened
(605) Which device removes any accumulated gas in the combustion chamber
burner?
Blower
(606) What are the three categories of gas supply systems?
Low, medium, and high
(607) Identify what you would use to determine if water is in the oil
Tank stick with water finding paste
(608) Identify all necessary elements that must be present for combustion?
Heat, air, and fuel
(608) How much of the flue gases are made up of nitrogen?
79%
(608) Why is carbon monoxide undesirable in flue gases, besides the fact that it is
dangerous?
Its presence in flue gases represents a waste of fuel
(608) The turndown of a burner is the ratio of the
maximum firing rate to the minimum firing rate
(609) Identify the relationship between excess air and complete combustion
Excess air is needed for complete combustion
(609) The condition that affects infiltration losses is the volume of
outside air that leaks through cracks and crevices
(610) A pressure-gun burner achieve flame turbulence by
causing the air to whirl as it leaves the gun tube
(611) The effect too much air has on a flame is that it makes it
short, noisy, and tends to pull away from the burner
(611) Identify the cause of a high CO2 reading during combustion
Insufficient draft and over firing
(612) Where does the signal to open and close a gas valve come from on modern
equipment?
