Lubricants Chemistry MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 23, 2025

1. Which of the following is the lowest temperature at which the soils give enough vapour?
(A) Flash point
(B) Cloud point
(C) Pour point
(D) Fire point

2. The formed vapour is ______ when the lubricating oil is volatilised.
(A) Non-inflammable
(B) Must be high
(C) Must be less
(D) Flammable

3. To find out the _____ Pensky Marten’s apparatus is used.
(A) Cloud point
(B) Pour point
(C) Fire point
(D) Flash point

4. The oil cup is made up of _____ in Pensky Marten’s apparatus.
(A) Copper
(B) Iron
(C) Brass
(D) Steel

5. By using _____, location of the cup in air bath can be known.
(A) Shutter
(B) Leaver
(C) Flange
(D) Pilot burner

6. By _____, flame exposure device is connected.
(A) Flange
(B) Oil cup
(C) Pilot burner
(D) Shutter

7. _____ must be present in transformer oils.
(A) Good dielectric strength
(B) More viscosity
(C) More oiliness
(D) Low dielectric strength

8. _____ for the lightest grade is the maximum pour point which is a requirement for a refrigerator system.
(A) -10°F
(B) -40°F
(C) -30°F
(D) -20°F

9. There are ____ mechanisms for lubrication.
(A) 3
(B) 2
(C) 1
(D) 4

10. Due to ____ property, liquid lubricants stick.
(A) Surface tension
(B) Mass of the liquid
(C) Temperature coefficient
(D) Viscosity

11. _____ is the range of coefficient of friction of the unlubricated surface.
(A) 0.1–1.0
(B) 0.1–0.5
(C) 0.1–1.5
(D) 1.5–2.0

12. Hydrodynamic lubrication’s effectiveness is not depending upon _____.
(A) Design of bearing
(B) Area of shaft
(C) Rate of rotation of the shaft
(D) Load

13. The coefficient of friction in boundary lubrication ranges _____.
(A) 0.05–0.1
(B) 0.5–0.15
(C) 1–1.5
(D) 0.05–0.15

14. ____ are formed in thin lubrication and wear and tear of metal surfaces are involved.
(A) P-n junctions
(B) Thin layers
(C) Layers
(D) Welded junctions

15. In _____ lubrication, generation of heat takes place.
(A) Thin lubrication
(B) Thick lubrication
(C) Boundary lubrication
(D) Extreme pressure lubrication

16. There is the possibility that the liquid lubricant can be _____.
(A) Boiled
(B) Heated
(C) Sublimated
(D) Evaporated