Obt3 Exam Script Tested Questions Full Solution Premium Study Material

OBT3 EXAM SCRIPT TESTED QUESTIONS
FULL SOLUTION PREMIUM STUDY
MATERIAL

●● approximately 96% to 99.75% of the fuel oil is composed of:
a) methane and propane
b)sulphur, oxygen and nitrogen
c) hydrogen and carbon
d)manufactured oil
Answer: c) hydrogen and carbon


●● that two general categories of refined fuel oils are:
a) distillates and residuals
b)light and dark
c)natural and manufactured
d)cracked and uncracked
Answer: a) distillates and residuals


●● true or false
kerosene is classified separately from fuel oil but considered as fuel oil
under the fuel oil code
Answer: true

,●● what are the 6 grades of fuel oil established by Canadian standards
and their common applications
Answer: gas --> 1-5
gasoline --> 6-10
leerosene --> 11-16
light fuel oil --> 13-17
heavy fuel oil --> 18-32
residuals --> 28-70


●● degrees of API gravity is a measurement scale of a fuel oil's
____________
Answer: density or weight


●● what is the API range of no. 2 fuel oil
Answer: 30 to 36


●● the commonly accepted heat valve of no.2 fuel oil is __________
btu/U.S.
Answer: 140,000


●● if the input rating of an appliance is 91,000 btu/h, the correct nozzle
size would be:

, a).50 gph
b).60 gph
c).65 gph
d).75 gph
Answer: .65 gph


●● viscosity is a measure of a fluid's:
a) density
b) heat content
c) resistance to flow
d) colour
Answer: c) resistance to flow


●● a fuel oil's viscosity _________ (increases or decreases) as the
temperature of the oil decreases
Answer: increases


●● the distillate characteristics of a fuel oil indicate its:
a) density
b) volatility and ability to vaporize
c)viscosity
d) flashpoint and fire point