DSL-202 Alt Final Exam

High levels of sulfur in a diesel fuel can ________.

• cause corrosion

• create acids (corrosives)

• cause components to stick

• All of the above

The RFS group is advocating for diesel engine manufacturers to approve the use of what percentage of a biodiesel to petroleum diesel mix?

• 25%

• 29%

• 20%

• 24%

What is the home heating oil grade number set by the ASTM?

• 2

• 4

• 1

• 5

Which of the following statements is correct with regard to fuel-handling additives?

• They are primarily for de-icing and pour point depressants

• They are primarily for smoke suppressants

• Both A and B

  
  

• Neither A nor B

Technician A says that a purpose-made fuel hydrometer is used to measure the API number of diesel fuel. Technician B says fuel's API number is

directly related to the fuels grade. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

Which of the following statements is correct with regard to the maintenance of diesel fuel?

• Petroleum diesel requires maintenance, but biodiesel does not.

• Biodiesel requires maintenance, but petroleum diesel does not

• Both A and B

• Neither A nor B

Technician A says that diesel engine combustion efficiency is typically less than 75% when using fuel without additives. Technician B says that when

clean, good-quality fuel is used, there is no need to add anything to fuel. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

A cetane boosting additive will ________.

• accelerate ignition point

• not change ignition point

• decrease ignition point

• None of the above

Technician A says that biodiesel, when compared to conventional diesel, has reduced emissions across all the indicators. Technician B says that a notable exception to the benefits of biodiesel is it can produce higher levels of NO in some engines. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

Technician A says that a small amount of gasoline mixed with diesel is still okay to use. Technician B says that provided the mixture is less than 2%, it

is still fine to use. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B