Diesel index serves as an alternative metric for quantifying diesel quality and is defined as_______________?
Show answer Hide answer
Answer: C. Equal to cetane number plus 3
Explanation
Diesel index is calculated from API gravity and aniline point, correlating closely with cetane number plus a constant offset.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Crude distillation topping columns operate under ________________ pressure conditions?
Show answer Hide answer
Answer: A. Atmospheric
Crude distillation topping columns operate under atmospheric pressure to separate volatile light fractions safely. Maintaining ambient pressure avoids the expensive compression equipment needed for high-pressure gas proc...
Q2. Navigational diesel fuels are specified to have a minimum cetane number of ___________________?
Show answer Hide answer
Answer: C. 45
Navigational and marine diesel fuels are specified to maintain a minimum cetane number of forty-five. A minimum cetane rating of forty-five ensures reliable ignition in large marine engines. Marine engine standards requi...
Q3. The deoiling of paraffin wax is carried out via its _________________?
Show answer Hide answer
Answer: D. Both B. & C.
Chilling the wax mixture forces high-melting paraffin crystals to precipitate out of the liquid solution. Solvent extraction uses selective chemicals to dissolve and wash away remaining oil impurities effectively. Combin...
Q4. During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) ________________ with increase in the amount of water?
Show answer Hide answer
Answer: B. Increases
Increasing the water content in the crude-water emulsion increases its electrical conductivity. Water droplets act as conductive pathways suspended within the continuous insulating oil medium. Higher water concentrations...
Q5. Diesel index is mathematically defined as_________________?
Show answer Hide answer
Answer: A. (°API) × (Aniline Point, °F)/100
The standard mathematical formula multiplies API gravity by aniline point in Fahrenheit and divides by one hundred. This empirical calculation correlates crude oil gravity and aromatic content with ignition quality. Engi...
Q6. Treating petroleum products with clay results in__________________?
Show answer Hide answer
Answer: D. All A., B. & C.
Clay treatment of petroleum products decolorizes cracked stocks and removes polar impurities. Active clay minerals adsorb colored bodies, gum-forming compounds, and trace sulfur species. Contacting fuels with adsorbent c...