OBT3_CERTIFICATION_EVALUATION_TEST_PAPER_2026_COMPLETE_QUESTIONS

OBT3 CERTIFICATION EVALUATION TEST
PAPER 2026 COMPLETE QUESTIONS AND
SOLUTIONS GRADED A+

●● what percent of fuel oil do hydrogen and carbon make up. Answer:
96 to 99%


●● what does distillation do. Answer: separates crude oil into
component fractions


●● what happens after distillation in the refining process. Answer:
catalytic cracking


●● what are the two phases in the refining process. Answer: distillation
and catalytic cracking


●● what are the categories of refined fuel oils. Answer: distillation and
residuals


●● what is the flash point. Answer: the lowest temperature that No.2 oil
can ignite but it wont stay lit

, ●● what is the lowest temperature flash piont can be for NO. 2 fuel oil.
Answer: 104F


●● what is fire point/ ignition point. Answer: the lowest temp and rapid
combustion will take place in air


●● what is No.2 oils fire point. Answer: 437F


●● what is pour point. Answer: the point at which the fuel oil barely
flows


●● what will happen if you mix No.1 fuel oil with No.2 fuel oil.
Answer: the pour point will lower for the No. 2 fuel oil


●● what is the cloud point. Answer: the temperature at which crystals
will start to form in the fuel oil


●● what is viscosity. Answer: measurement of fluids resistance to flow


●● as temp goes down what will happen to viscosity. Answer: it will
increase


●● how many btu of heat are generated from one gallon of No. 2 fuel
oil. Answer: 140,000BTU