Title: Unit 6 Quiz
Course: ENGY 131 Biodiesel Production > Section: ENGY 131 Biodiesel Production

Q: Generally, biodiesel is not susceptible to oxidation upon exposure to air.
- True
- False
A: False

Q: The issue of oxidative stability affects biodiesel during extended storage.
- True
- False
A: True

Q: ASTM D 6078 is also known as the scuffing ball-on-cylinder lubricity evaluator.
- True
- False
A: True

Q: B100 possesses excellent lubricity.
- True
- False
A: True

Q: ULSD is an acronym for ultra-liquid sulfurous diesel.
- True
- False
A: False

Q: Which of the following tests is the most common method for assessing oxidative stability in biodiesel?
- Differental scanning calorimetry
- Rancimat test
- Standard Test Method for Distillate Fuel
- None of the above
A: Rancimat test

Q: Neat biodiesel is defined as B2.
- True
- False
A: False

Q: Engine oil dilution can increase engine wear, however fresh biodiesel may decrease wear, while aged biodiesel can increase engine wear.
- True
- False
A: True

Q: Diesel engines rely on the fuel itself to lubricate certain vital engine parts such as injectors and fuel pumps.
- True
- False
A: True

Q: Biodiesel oxidation has no effect on fuel quality.
- True
- False
A: False

Q: Viscosity is defined as:
- A measure of turbidity
- A measure of resistance of flow of a liquid due to internal friction.
- A measure of fuel properties relative to the scale of its cetane number.
- All of the above
A: A measure of resistance of flow of a liquid due to internal friction.

Q: NOx exhaust emissions usually increase slightly when operating a diesel engine with biodiesel.
- True
- False
A: True

Q: If a cetane number is too high, what happens in the engine?
- Combustion can occur before the fuel and air are properly mixed, resulting in incomplete combustion and smoke.
- Engine roughness, misfiring, higher air temperatures, slower engine warm-up, and also incomplete combustion occur.
- There are no operational problems.
A: Combustion can occur before the fuel and air are properly mixed, resulting in incomplete combustion and smoke.

Q: The CN scale is similar to the octane scale used for gasoline & was established for describing the ignition quality of petrodiesel or its components.
- True
- False
A: True

Q: The cetane number of a diesel fuel is determined by the ignition delay time.
- True
- False
A: True

Q: Modern engines equipped with injection systems that control the rate of injection are not highly sensitive to CN.
- True
- False
A: True

Q: The higher the viscosity, the greater the tendency of the fuel to cause problems.
- True
- False
A: True

Q: No. 2 (DF2) is obtained from the 170–270°C boiling range (as are kerosene and jet fuel) and is applicable to high-speed engines whose operation involves frequent and relatively wide variations in engine load and speed. It is required for use at abnormally low temperatures.
- True
- False
A: False

Q: Which of the following describes the cetane number?
- A dimensionless descriptor of the ignition quality of diesel fuel.
- An alpha-numeric, variable scale that describes diesel fuel quality.
- An ISO fuel quality scale relative to BV/h.
- None of the above
A: A dimensionless descriptor of the ignition quality of diesel fuel.

Q: Which of the following are standards for conventional DF? (Check all correct responses)
- ASTM D 613
- ISO 5165
- ASTM D 6751
- EN 14214
- All of the above
A: ASTM D 613; ISO 5165