Lubricants MCQ Questions and Answers for Practice

1. Viscosity index can be defined as

1. (L-U / L-H) X 100
2. (L+U / L-H) X 100
3. (L-H / L-U) X 100
4. (L-H / L+U) X 100

2. Animal and vegetable oils are also used as

1. Oiliness carrier
2. Blending agent
3. Solvent agent
4. Extreme pressure additives

3. Animal and vegetable oils possess

1. Good oiliness
2. Poor oiliness
3. Optimum oiliness
4. None of above

4. Antiwear additive in extreme pressure additive is

1. Soapstone
2. Tricresyl phosphate
3. Mica
4. Graphite

5. Calcium soap base grease is also called as

1. Soap grease
2. Greases
3. Axle grease
4. Cup grease

6. Coefficient of friction for boundary lubrication is

1. 0.5 to 15
2. 0.005 to 0.05
3. 0.5 to 0.15
4. 0.05 to 0.15

7. Coefficient of friction in fluid film or hydrodynamic lubrication is

1. 0.1 to 0.3
2. 0.01 to 0.03
3. 0.001 to 0.03
4. None of above

8. Ethanol is used as

1. Polymeric thickener
2. Polymer
3. Polymeric thinner
4. None of above

9. Graphite is .............. lubricant.

1. Solid
2. Liquid
3. Semi solid
4. None of above

10. Identify liquid lubricant from the following

1. Graphite
2. Lubricating oil
3. Mo Disulphide
4. Soapstone

11. Identify the odd type of lubricant from following

1. Semi solid
2. Liquid
3. Gaseous
4. Solid

12. Important extreme pressure additives contains functional group from following

1. Chlorides
2. Sulphides
3. Phosphides
4. All of above

13. Length of hydrocarbon chain in petroleum oils varies between about

1. 0 to 12 Carbon atoms
2. 0 to 50 Carbon atoms
3. 21 to 30 Carbon atoms
4. 12 to 50 Carbon atoms

14. Minimum separating distance in hydrodynamic lubrication is

1. 100 A⁰
2. 1000 A⁰
3. 10000 A⁰
4. 10 A⁰

15. Special additives added to mineral oils are known as

1. Extreme pressure additives
2. Special additives
3. Mineral additives
4. Lubricating additives