Subtopic: Bio-fuels and their use in farm mechanization
Question Statement:
Which of the following statements comparing commercial B100 biodiesel with conventional petroleum diesel is/are correct?
Options:
(A) Biodiesel has higher kinematic viscosity than petrodiesel, which can affect fuel spray droplet atomization at cold ambient temperatures.
(B) Biodiesel has a significantly higher flash point (>130°C) than petrodiesel (~55–65°C), making it safer to handle and store.
(C) Biodiesel possesses inherent lubricity that protects fuel injection pumps from premature wear compared to ultra-low sulfur diesel (ULSD).
(D) Biodiesel contains significantly higher sulfur content than petroleum diesel, leading to higher sulfur oxide ($SO_2$) emissions.
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
• Biodiesel has higher kinematic viscosity ($4.0 - 6.0\text{ cSt}$ vs $2.0 - 4.5\text{ cSt}$ for diesel) (A is correct).
• Flash point of B100 exceeds 130°C, classified as non-hazardous for storage (B is correct).
• Oxygenated esters in biodiesel provide natural boundary lubrication for high-pressure injection equipment (C is correct).
• Biodiesel contains virtually zero sulfur, greatly reducing $SO_2$ emissions (D is false).