Question Bank • QB_FP_107 MSQ • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Fuels and combustion

Question Statement:

Which of the following statements comparing pure biodiesel (B100) with petroleum diesel fuel are CORRECT?

Options:

  • (A) Biodiesel has a higher cetane number than standard fossil diesel
  • (B) Biodiesel has approximately $8\%$ to $10\%$ lower lower calorific value (energy density) per unit mass
  • (C) Biodiesel contains oxygen molecules in its ester chemical structure
  • (D) Biodiesel produces higher carbon monoxide ($CO$) emissions in engine exhaust

Answer Key:

A, B, C

Step-by-Step Solution & Explanation

- A is correct: Methyl/ethyl esters have higher cetane ratings (often > 50). - B is correct: LCV of biodiesel is ~38-40 MJ/kg compared to 42.5-43 MJ/kg for petro-diesel. - C is correct: Biodiesel contains ~10-11% oxygen by mass (oxygenated fuel). - D is incorrect: Due to intrinsic oxygen, combustion is more complete, resulting in lower CO and unburnt hydrocarbon emissions.
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