Interview question based on skill :
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Total Questions: 14
1. Acid number of a lubricating oil is_________required to neutralise all acidic constituents of 1 g of oil.
Correct Answer is : Mgs of KOH
2. The fatty oils mostly constitute _________
Correct Answer is : Glycerol
3. The acid content ______ with time.
Correct Answer is : Increases
4. Periodic determination of acid number is useful to indicate the progress of________
Correct Answer is : Oxidation number
5. The acid value of the lubricating oil is must be less than _______
Correct Answer is : 0.1
6. The unblended petroleum oils must have ______ neutralisation values.
Correct Answer is : Very low
7. Compounded oils have higher neutralisation values.
Correct Answer is : TRUE
8. The higher values of blended oils is because of the presence of ___________
Correct Answer is : Additives
9. Darkening of the oil colour takes place due to ________
Correct Answer is : Oxidation
10. The neutralisation number cannot give the __________ of the lubricating oil.
Correct Answer is : Corrosive nature
11. The total acid number of an oil is given by ______
Correct Answer is : Acid value= (volume of 0.1N KOH used*56)/(weight of oil taken)
12. The corrosion problems are caused by _____ in lubricating oil.
Correct Answer is : Naphthenic acid
13. The other parameters apart from the acid number can also determine by the process _______
Correct Answer is : Spectroscopic methods
14. In potentiometric titration, the sample is dissolved in _____ and ______
Correct Answer is : Toulene, propanol
