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JOURNEYMAN OIL EXAM QUESTIONS WITH ANSWERS #7
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JOURNEYMAN OIL EXAM QUESTIONS WITH ANSWERS #7The use of furnace cement or other materials to seal a cracked heat exchanger or parts
which provide closure shall be for _________ repairs only. - correct answer Temporary
repairs
If a fuel storage tank is permanently removed from service for whatever reason, the tank
and all the piping connected to it, including the outside fill and vent piping and any
supply piping connected to the appliance, shall be: - correct answer -Emptied of all
liquid contents and sludge.
-Cleaned and rendered free of combustible vapors.
-Removed from premises or property.
-Properly disposed of in accordance with all applicable local, state, and federal rules
and regulations.
What is an indicator that you may have a plugged fuel filter? - correct answer -High
vacuum on the oil line.
-Tripped control.
What is the normal fuel pressure delivered to the nozzle? - correct answer -Older
burners = 100psi
-Newer burners= 140psi
Oil lines need about ______ to ______ Hg of vacuum for each foot we lift of oil. _____
inch of vacuum for each 10 feet of horizontal run and ______ inch for a clean oil filter. -
correct answer .75' to 1" Hg for each foot of lifted oil.
1" of vacuum for each 10 feet of horizontal run.
1/2" of vacuum for a clean oil filter.
To calculate the vacuum, figure about ____ of vacuum for each foot of oil lift, _____ of
vacuum for each _____ feet of horizontal run, and ______ for a clean oil filter. - correct
answer 1" inch
1" inch
10' feet
1/2" inch
What is the calculated vacuum for a two stage pump operating with 7ft of lift and 30ft of
horizontal offset? - correct answer 10.5 Hg
What is the radius of a pipe? - correct answer Half the diameter.
What is the diameter of a pipe? - correct answer Distance across the the pipe.
What is the circumference of a pipe? - correct answer Diameter x PI
,The technician may install the branch circuit overcurrent device, provided a space in the
electrical panel is available. The technician may also install the associated low voltage
wiring provided its power supply is fed from the heating branch circuit. True/False? -
correct answer Ture
Warm air ducts can have a heat loss as great as? - correct answer 40%
Direct vent heating units less than 50,000 BTU's may be vented _______ from a
window. - correct answer 9" inches
One pound of water pressure is good for how many feet of height in pipe? - correct
answer 2.3 feet
Can a chimney connector pass through a wall? - correct answer Yes.
If all combustible materials in the wall are cut away from the chimney connector a
sufficient distance to provide the clearance required and a non combustible material is
used to close up the opening.
Appliances requiring a negative chimney draft, the chimney connector shall be not
longer than ______% of the portion of the chimney above the chimney connector inlet. -
correct answer 75%
The resistance of a chad cell should be around _______ ohms or more when sensing
darkness. - correct answer 100,000 ohms
What is the main reason for chamberless firing? - correct answer Better heat transfer.
When doing an efficiency test, the burner must run for a minimum of 5 minutes to
allow... - correct answer The appliance to reach a steady state.
How many times do you pump a "wet" tester for a proper CO2 sample? - correct answer
18-20 times.
What are the normal ohms readings of a cad cell when the burner is running? - correct
answer 300 - 1000 ohms.
Controls that are reverse acting operate in what manner? - correct answer Close on
rise.
Name the function of a fan/limit switch on a warm air furnace. - correct answer -Monitors
heat/temp.
-High limit.
On multi-unit installations the emergency and thermal electrical switches shall be wired
in series through individual unit relays so that if one switch is opened, all the equipment
, will be rendered inoperable whenever the emergency switch is opened. True/false? -
correct answer True.
Vent pipes shall terminate no more than ____ feet from the fill pipe and at a point visible
from the fill point. - correct answer 12 feet.
All vent pipes shall terminate outside of a building at a point no less than ______ from
any building opening. - correct answer 2 feet.
What type of ignition turns off after flame is established? - correct answer Interrupted
ignition.
What type of ignition stays on while the burner is running? - correct answer Intermittent
ignition.
To change the air ratio for different firing rates on an adjustable head burner, you must
do this: - correct answer Adjust the position of the draw assembly in the air tube.
Air is ____% oxygen, ____% nitrogen, and ____% other gases. - correct answer -20.9%
oxygen.
-78% Nitrogen.
-1.1% other gases.
What is the normal fuel pump pressure of a high pressure oil burner? - correct answer -
100psi for older burners.
-140psi for newer burners.
Where fed directly from a storage oil tank, the fuel supply system shall be designed so
that the burner fuel unit operates with less than _____ in H.G. - correct answer 10 in
H.G.
What is the purpose of the OSV devise? - correct answer -Limits pressure on burner
pumps to a max 3psi.
-Automatic shut off if line is broken.
What is the maximum running vacuum for a single stage fuel pump? - correct answer 6"
H.G.
If the top of the oil supply source is more than __(1)__ feet above the fuel unit you need
to install a __(2)__ valve.
The NFPA rating for the head pressure on a fuel unit is only __(3)__ PSI, about __(4)__
feet of head.
If the tank head is greater than __(5)__ feet, the supply oil pressure may exceed
__(6)__ PSI, and therefore, shorten shaft seal life.
A __(7)__ valve or __(8)__ valve should be used in the oil supply line. - correct answer
1.) 8 Feet
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