OHIO BIOFUEL TECHNICIAN EXAM
PRACTICE QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT
DOWNLOAD
1. What is the primary feedstock used in biodiesel production in the United
States?
a) Corn starch
b) Soybean oil
c) Sugarcane
d) Switchgrass
Soybean oil is the most common feedstock for biodiesel in the U.S. due to its
high oil yield and availability.
2. Which process is used to convert oils and fats into biodiesel?
a) Fermentation
b) Transesterification
c) Hydrogenation
d) Pyrolysis
Transesterification converts triglycerides into methyl esters (biodiesel) and
glycerol.
3. What is the main byproduct of biodiesel production?
a) Methanol
b) Ethanol
c) Glycerin
d) Carbon dioxide
Glycerin is a byproduct formed when triglycerides react with alcohol during
biodiesel synthesis.
,4. What is the energy content of biodiesel compared to petroleum diesel?
a) Higher
b) Slightly lower
c) Equal
d) Twice as much
Biodiesel contains about 8–10% less energy per gallon than petroleum
diesel.
5. Ethanol is primarily produced by fermenting which material?
a) Vegetable oils
b) Cellulose
c) Sugars and starches
d) Algae
Ethanol production relies on fermentable sugars or starches from corn,
sugarcane, or grains.
6. Which microorganism is most commonly used in ethanol fermentation?
a) Bacteria
b) Yeast (Saccharomyces cerevisiae)
c) Algae
d) Fungi
Yeast converts sugars into ethanol and carbon dioxide during fermentation.
7. What is the flash point of biodiesel compared to petroleum diesel?
a) Lower
b) Higher
c) Same
d) Unstable
Biodiesel’s higher flash point makes it safer to store and handle.
8. Which federal agency regulates biofuel quality standards in the U.S.?
a) USDA
b) DOE
c) EPA
d) DOT
The U.S. Environmental Protection Agency (EPA) enforces renewable fuel
standards and quality compliance.
, 9. What ASTM standard applies to biodiesel fuel quality?
a) D975
b) D5798
c) D6751
d) D7467
ASTM D6751 sets the specification for biodiesel (B100) used in blends.
10. What is the term for blending 20% biodiesel with 80% petroleum diesel?
a) B10
b) B20
c) B80
d) B5
B20 refers to a blend containing 20% biodiesel and 80% petroleum diesel.
11. What is the main benefit of using biodiesel in diesel engines?
a) Higher NOx emissions
b) Reduced particulate matter and CO emissions
c) Lower lubricity
d) Reduced fuel economy
Biodiesel burns cleaner, reducing carbon monoxide and particulate
emissions.
12. Which alcohol is most commonly used in biodiesel production?
a) Ethanol
b) Methanol
c) Butanol
d) Propanol
Methanol reacts with triglycerides to produce methyl esters (biodiesel).
13. What is the primary goal of the Renewable Fuel Standard (RFS)?
a) To increase petroleum imports
b) To reduce ethanol use
c) To promote renewable fuel production and reduce greenhouse gas
emissions
d) To tax biodiesel production
The RFS encourages the blending of renewable fuels into transportation
fuel.
PRACTICE QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT
DOWNLOAD
1. What is the primary feedstock used in biodiesel production in the United
States?
a) Corn starch
b) Soybean oil
c) Sugarcane
d) Switchgrass
Soybean oil is the most common feedstock for biodiesel in the U.S. due to its
high oil yield and availability.
2. Which process is used to convert oils and fats into biodiesel?
a) Fermentation
b) Transesterification
c) Hydrogenation
d) Pyrolysis
Transesterification converts triglycerides into methyl esters (biodiesel) and
glycerol.
3. What is the main byproduct of biodiesel production?
a) Methanol
b) Ethanol
c) Glycerin
d) Carbon dioxide
Glycerin is a byproduct formed when triglycerides react with alcohol during
biodiesel synthesis.
,4. What is the energy content of biodiesel compared to petroleum diesel?
a) Higher
b) Slightly lower
c) Equal
d) Twice as much
Biodiesel contains about 8–10% less energy per gallon than petroleum
diesel.
5. Ethanol is primarily produced by fermenting which material?
a) Vegetable oils
b) Cellulose
c) Sugars and starches
d) Algae
Ethanol production relies on fermentable sugars or starches from corn,
sugarcane, or grains.
6. Which microorganism is most commonly used in ethanol fermentation?
a) Bacteria
b) Yeast (Saccharomyces cerevisiae)
c) Algae
d) Fungi
Yeast converts sugars into ethanol and carbon dioxide during fermentation.
7. What is the flash point of biodiesel compared to petroleum diesel?
a) Lower
b) Higher
c) Same
d) Unstable
Biodiesel’s higher flash point makes it safer to store and handle.
8. Which federal agency regulates biofuel quality standards in the U.S.?
a) USDA
b) DOE
c) EPA
d) DOT
The U.S. Environmental Protection Agency (EPA) enforces renewable fuel
standards and quality compliance.
, 9. What ASTM standard applies to biodiesel fuel quality?
a) D975
b) D5798
c) D6751
d) D7467
ASTM D6751 sets the specification for biodiesel (B100) used in blends.
10. What is the term for blending 20% biodiesel with 80% petroleum diesel?
a) B10
b) B20
c) B80
d) B5
B20 refers to a blend containing 20% biodiesel and 80% petroleum diesel.
11. What is the main benefit of using biodiesel in diesel engines?
a) Higher NOx emissions
b) Reduced particulate matter and CO emissions
c) Lower lubricity
d) Reduced fuel economy
Biodiesel burns cleaner, reducing carbon monoxide and particulate
emissions.
12. Which alcohol is most commonly used in biodiesel production?
a) Ethanol
b) Methanol
c) Butanol
d) Propanol
Methanol reacts with triglycerides to produce methyl esters (biodiesel).
13. What is the primary goal of the Renewable Fuel Standard (RFS)?
a) To increase petroleum imports
b) To reduce ethanol use
c) To promote renewable fuel production and reduce greenhouse gas
emissions
d) To tax biodiesel production
The RFS encourages the blending of renewable fuels into transportation
fuel.
