OBT3 CERTIFICATION SCRIPT 2026
QUESTIONS WITH SOLUTIONS
GRADED A+
◍ As the ratio of carbon to hydrogen atoms increases in comparing
hydrocarbon molecules then the heavier the molecule, the slower it burns
and the more heat per volume it producesSelect one:TrueFalse.
Answer: true
◍ Which of the following should be worn when using power tools? a) Safety
glasses b) A hard hat c) Leather gloves d) Safety boots.
Answer: A
◍ What is the minimum acceptable type of respiratory protection to be used
when cleaning a soot filled furnace?.
Answer: Disposable Filter Masks
◍ Approximately 96% to 99.75% of fuel oil is composed of:Select
one:a.methane and propaneb.sulphur, oxygen and nitrogenc.hydrogen and
carbond.manufactured oil.
Answer: hydrogen and carbon
◍ The minimum flash point of No. 2 fuel oil allowed by Standard is:Select
one:a.38°C (100°F)b.68°C (155°F)c.150°C (300°F)d.100°C (212°F).
Answer: 38C (100F)
◍ What is the proper vertical to horizontal distance ratio for ladder
placement?.
Answer: 3:1 or 4:1
◍ A fuel oil with a high temperature cloud point may cause:Select
one:a.Excessive corrosion of the appliance and ventb.The fuel oil to flow
, faster through the nozzlec.Filters, fuel lines or burner parts to become
clogged with wax when the fuel is coldd.Filters, fuel lines or burner parts to
become clogged with clouds when the fuel is hot.
Answer: filters, fuel lines, or burner parts to become clogged with wax when
fuel is cold
◍ What muscles or parts of your body should you primarily use to lift a weight
from the floor?.
Answer: Stomach muscles and legs
◍ When changing a drill bit or saw blade on a power tool, what is first action
that you should take?.
Answer: Disconnect from the power source
◍ Smoke and soot produced by the combustion of oil are unburnt ______
(carbon or hydrogen) atoms which indicates that __________ (complete or
incomplete) combustion is occurring..
Answer: carbon & incomplete
◍ Excess air is necessary for complete combustion of fuel oilSelect
one:TrueFalse.
Answer: true
◍ Name two safety concerns created by the customer's housekeeping
practices?.
Answer: Messy and poor lit work areas
◍ Name two areas that each of the following substances may be encountered
in the oil heat trade: Asbestos and Silica:.
Answer: Insulation, older ceiling tileRefactory material, cement
◍ You must never use a chisel with a ______________ head.
Answer: Mushroomed
◍ Name three types of pliers:.
Answer: Side lockedLinesmanNeedle-nose
◍ A _____________ wrench is better suited to loosening tight nuts..
, Answer: Box
◍ Name three types of snips:.
Answer: CombinationCompoundStraight
◍ A masonry drill bit is suited for drilling into concrete due to its
____________ tip.
Answer: Carbide
◍ The ultimate CO2 from the combustion of No.2 fuel oil and air is:Select
one:a.11.9%b.15.3%c.25.6%d.9.9%.
Answer: 15.3%
◍ ______________ hammers are best suited for striking chisels..
Answer: Ball Peen
◍ Name three types of screwdrivers:.
Answer: PhillipsRobertsonSlotted
◍ What are some of the symptoms of carbon monoxide poisoning?Select
one:a.Headaches, nausea, dizzinessb.Disorientation, rapid heart rate, blue
lipsc.Deathd.All of the available choices.
Answer: all of the above
◍ The products of complete combustion of fuel oil and air are:Select
one:a.Carbon monoxideb.Carbon trioxidec.Carbon dioxided.Soot.
Answer: carbon dioxide
◍ ___________ should be used when making sharp turn cuts in sheet metal?.
Answer: Compound Snips (Aviation Snips)
◍ What is the approximate composition of air?Select one:a.21% oxygen and
79% nitrogenb.16% oxygen and 84% nitrogenc.79% oxygen and 21%
nitrogend.50% oxygen and 50% nitrogen.
Answer: 21% oxygen & 79% nitrogen
◍ Name four types of wrenches.
Answer: Open end, box end, cominations , adjustable
QUESTIONS WITH SOLUTIONS
GRADED A+
◍ As the ratio of carbon to hydrogen atoms increases in comparing
hydrocarbon molecules then the heavier the molecule, the slower it burns
and the more heat per volume it producesSelect one:TrueFalse.
Answer: true
◍ Which of the following should be worn when using power tools? a) Safety
glasses b) A hard hat c) Leather gloves d) Safety boots.
Answer: A
◍ What is the minimum acceptable type of respiratory protection to be used
when cleaning a soot filled furnace?.
Answer: Disposable Filter Masks
◍ Approximately 96% to 99.75% of fuel oil is composed of:Select
one:a.methane and propaneb.sulphur, oxygen and nitrogenc.hydrogen and
carbond.manufactured oil.
Answer: hydrogen and carbon
◍ The minimum flash point of No. 2 fuel oil allowed by Standard is:Select
one:a.38°C (100°F)b.68°C (155°F)c.150°C (300°F)d.100°C (212°F).
Answer: 38C (100F)
◍ What is the proper vertical to horizontal distance ratio for ladder
placement?.
Answer: 3:1 or 4:1
◍ A fuel oil with a high temperature cloud point may cause:Select
one:a.Excessive corrosion of the appliance and ventb.The fuel oil to flow
, faster through the nozzlec.Filters, fuel lines or burner parts to become
clogged with wax when the fuel is coldd.Filters, fuel lines or burner parts to
become clogged with clouds when the fuel is hot.
Answer: filters, fuel lines, or burner parts to become clogged with wax when
fuel is cold
◍ What muscles or parts of your body should you primarily use to lift a weight
from the floor?.
Answer: Stomach muscles and legs
◍ When changing a drill bit or saw blade on a power tool, what is first action
that you should take?.
Answer: Disconnect from the power source
◍ Smoke and soot produced by the combustion of oil are unburnt ______
(carbon or hydrogen) atoms which indicates that __________ (complete or
incomplete) combustion is occurring..
Answer: carbon & incomplete
◍ Excess air is necessary for complete combustion of fuel oilSelect
one:TrueFalse.
Answer: true
◍ Name two safety concerns created by the customer's housekeeping
practices?.
Answer: Messy and poor lit work areas
◍ Name two areas that each of the following substances may be encountered
in the oil heat trade: Asbestos and Silica:.
Answer: Insulation, older ceiling tileRefactory material, cement
◍ You must never use a chisel with a ______________ head.
Answer: Mushroomed
◍ Name three types of pliers:.
Answer: Side lockedLinesmanNeedle-nose
◍ A _____________ wrench is better suited to loosening tight nuts..
, Answer: Box
◍ Name three types of snips:.
Answer: CombinationCompoundStraight
◍ A masonry drill bit is suited for drilling into concrete due to its
____________ tip.
Answer: Carbide
◍ The ultimate CO2 from the combustion of No.2 fuel oil and air is:Select
one:a.11.9%b.15.3%c.25.6%d.9.9%.
Answer: 15.3%
◍ ______________ hammers are best suited for striking chisels..
Answer: Ball Peen
◍ Name three types of screwdrivers:.
Answer: PhillipsRobertsonSlotted
◍ What are some of the symptoms of carbon monoxide poisoning?Select
one:a.Headaches, nausea, dizzinessb.Disorientation, rapid heart rate, blue
lipsc.Deathd.All of the available choices.
Answer: all of the above
◍ The products of complete combustion of fuel oil and air are:Select
one:a.Carbon monoxideb.Carbon trioxidec.Carbon dioxided.Soot.
Answer: carbon dioxide
◍ ___________ should be used when making sharp turn cuts in sheet metal?.
Answer: Compound Snips (Aviation Snips)
◍ What is the approximate composition of air?Select one:a.21% oxygen and
79% nitrogenb.16% oxygen and 84% nitrogenc.79% oxygen and 21%
nitrogend.50% oxygen and 50% nitrogen.
Answer: 21% oxygen & 79% nitrogen
◍ Name four types of wrenches.
Answer: Open end, box end, cominations , adjustable
