Petroleum Refinery Engineering - Study Mode

[#246] Sour crude means the __________ bearing crude.
Correct Answer

(B) Sulphur compounds

[#247] Penetration test determines the __________ of the grease.
Correct Answer

(A) Stiffness

[#248] Isomerisation converts the __________ tot-paraffins.
Correct Answer

(A) Paraffins

[#249] Which of the following additives improves the cetane number of diesel?
Correct Answer

(D) Tetra ethyl lead

Explanation

Solution: Option A: Amyl nitrate - Amyl nitrate is not commonly used as an additive to improve the cetane number of diesel. It is more commonly associated with other applications, such as as a vasodilator or in the production of explosives. Option B: Ethyl mercaptan - Ethyl mercaptan is a compound used primarily as an odorant in natural gas and propane. It is not used to improve the cetane number of diesel fuel. Option C: Napthenic acid - Napthenic acid is a type of organic acid found in petroleum. While it is sometimes used as an additive in lubricating oils, it is not used to improve the cetane number of diesel. Option D: Tetra ethyl lead - Tetra ethyl lead is the correct additive that improves the cetane number of diesel fuel. It enhances the ignition quality of diesel, leading to smoother engine operation and lower emissions. Conclusion: Among the options provided, Option D: Tetra ethyl lead is the correct additive used to improve the cetane number of diesel fuel. Therefore, the correct answer is Option D .

[#250] Which of the following is an additive used for improving the cetane number of diesel?
Correct Answer

(A) Tetraethyl lead

Explanation

Solution: In petroleum refinery engineering, the additive used for improving the cetane number of diesel is Tetraethyl lead (Option A). The cetane number is a measure of the ignition quality of diesel fuel. Higher cetane numbers indicate better ignition quality, leading to smoother engine operation, reduced noise, and lower emissions. Tetraethyl lead is one of the additives used to increase the cetane number of diesel fuel by improving its combustion characteristics. Therefore, the correct option is Option A: Tetraethyl lead .