This set of Chemical Process Technology Multiple Choice Questions & Answers (MCQs) focuses on “Natural Products – Petroleum – 1”.
1. Which of the following series comprises the largest fraction of petroleum crude?
a) n-paraffin series
b) Naphthene series
c) Asphalts
d) Isoparaffin series
View Answer
Explanation: n-paraffin series comprises the largest fraction of petroleum crude; second abundant series in crude is Naphthene series followed by others. Naphthene series are saturated.
2. Asphaltenes are soluble in paraffin’s.
a) True
b) False
View Answer
Explanation: The statement is false as Asphaltenes are soluble in aromatics. They are brownish black solids chemically composed of carbon, hydrogen along with sulfur, oxygen, and nitrogen.
3. What is the relationship between octane number and power number?
a) \(Octane \,number = \frac{power \, number+100}{3}- 100\)
b) \(Octane \,number = \frac{power \, number-100}{3}* 100\)
c) \(Octane \,number = \frac{power \, number-100}{3}+ 100\)
d) \(Octane \,number = \frac{power \, number+100}{3}+ 100\)
View Answer
Explanation: \(Octane \, number = \frac{power \, number-100}{3}+ 100\) is the relationship between octane number and power number. Power extracted from the system is the basis for power number.
4. __________________ causes knocking.
a) Low expansion
b) Low compression
c) High expansion
d) High compression
View Answer
Explanation: High compression is the cause of knocking effect. Some anti-knocking agents are used such as lead tetra methyl, lead tetra ethyl and so on which slow down the burning rate and hence reduce the knocking effect.
5. Which of the following is not an intermediate distillate product in petroleum refining?
a) Heavy fuel oils
b) Diesel oils
c) Lubricating oil
d) Gas oil
View Answer
Explanation: Petroleum refining products constitute light ends, light heating oil’s, intermediate distillates, heavy distillates, Residues, and also by-products. Diesel oils, Heavy fuel oils, Gas oil are the intermediate distillates where Lubricating oil is a heavy distillate.
6. Residue formed in the petroleum refining is ______________
a) Waxes
b) Asphalt
c) Ammonia
d) Gas oil
View Answer
Explanation: Residues formed during petroleum refining are lubricants, fuel oil, petrolatum, asphalt, road oil, greases, and petroleum coke. Waxes are heavy distillates, ammonia is a byproduct, and gas oil is an intermediate distillate.
7. Which of the following is not produced as heavy distillate in petroleum refinery process?
a) Waxes
b) Frothing oil
c) Lubricating oil
d) Petroleum coke
View Answer
Explanation: Floating and frothing oil, mineral oil, waxes, and lubricating oil are the heavy distillates produced in petroleum refinery process where petroleum coke is a residue.
8. Which residue of petroleum refinery process is used as electrodes?
a) Petroleum coke
b) Ammonia
c) Wax
d) Fuel oil
View Answer
Explanation: Petroleum coke, one of the residues of petroleum refinery process is used in electrodes and also used for aluminium plants. Fuel oil is a residue, Wax is a heavy distillate, and Ammonia is a by-product.
9. Which of the following is a by-product of petroleum refining process?
a) Fuel oil
b) Diesel oil
c) Ammonia
d) Lubricating oil
View Answer
Explanation: Ammonia, detergents, sulfur and its derivatives are the byproducts produced in the petroleum refinery process. There are different types of refineries to refine petroleum.
10. Which of the following unit operation is based on relative solubility in different solvents?
a) Extraction
b) Adsorption
c) Distillation
d) Crystallization
View Answer
Explanation: Extraction is a separation technique used to separate mixture basing on relative solubility in different solvents. This technique is mostly used in lube oil manufacture.
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