Lubricants interview questions part 3
Lubricants interview questions part 3
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. The lubricating oils must be refined to remove ___________
Correct Answer is : Wax
2. Easily oxidised impurities cause ___________
Correct Answer is : Sludge formation
3. To improve the refined petroleum oils ______ are added.
Correct Answer is : Additives
4. A dispersion system consisting of two immiscible liquids is called ________
Correct Answer is : Emulsions
5. In oil in water emulsions, how much water is present _______
Correct Answer is : 3-20%
6. The emulsifiers in water in oil type emulsions are ________
Correct Answer is : Alkaline earth soaps
7. The lowest temperature at which the oils gives enough vapour.
Correct Answer is : Flash point
8. The fire point is the lowest temperature at which the vapour of oil burns continuously for at least ________ when a small flame is brought near to it.
Correct Answer is : 5 Seconds
9. The fire point of an oil is about ________ higher than the flash point.
Correct Answer is : 5-40oC
10. The lubricating oil is volatilises then the formed vapour _____
Correct Answer is : Non- inflammable
11. Pensky -Marten’s apparatus is used to find out the ________
Correct Answer is : Flash point
12. Oil cup in Pensky-marten’s apparatus is made with __________
Correct Answer is : Brass
13. The location of the cup in air bath can be known using __________
Correct Answer is : Flange
14. Flame exposure device is connected with _______
Correct Answer is : Shutter
15. Transformer oils must have _________
Correct Answer is : Good dielectric strength
16. For refrigerator system, the oils with the low viscosity, high cloud point and low pour point are used.
Correct Answer is : FALSE
17. The maximum pour-point requirements for refrigerator system are about ________ for lightest grade.
Correct Answer is : -40oF
18. For heavy cutting, the effective lubricants are _________
Correct Answer is : cutting oils
19. The reduction in friction is only when _____ of the oil film is ______ than that of the metal.
Correct Answer is : shear strength, less
20. The friction is needed to be reduced because _____
Correct Answer is : it will be reducing the excess heat generation
