OBT3_EXAMS_SET_2026_FULL_SOLUTION_VIEW_AHEAD_QUESTIONS_AND_ANSWERS

OBT3 EXAMS SET 2026 FULL SOLUTION
VIEW AHEAD QUESTIONS AND ANSWERS
GRADED A+

●● Approximately 96% to 99.75% of fuel oil is composed of:
Select one:
a.
methane and propane
b.
sulphur, oxygen and nitrogen
c.
hydrogen and carbon
d.
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)


●● A fuel oil with a high temperature cloud point may cause:
Select one:
a.
Excessive corrosion of the appliance and vent
b.
The fuel oil to flow faster through the nozzle
c.
Filters, fuel lines or burner parts to become clogged with wax when the
fuel is cold
d.
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


●● 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 oil
Select one:
True
False. Answer: true


●● 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%


●● What are some of the symptoms of carbon monoxide poisoning?
Select one:
a.
Headaches, nausea, dizziness
b.
Disorientation, rapid heart rate, blue lips