Question 1: The purpose of lubrication is
| A. To reduce friction. |
| B. To reduce wear. |
| C. Transfer heat produced. |
| D. All of above. |
(A)
(B)
(C)
(D)
Question 2: Which of the following is NOT a function of lubricant in IC engine?
| A. Form a film to separate the surfaces. |
| B. Adhere to surface. |
| C. Withstand high temperature inside the cylinder. |
| D. Reduce the size of the asperities and improve the surface finish. |
(A)
(B)
(C)
(D)
Question 3: Synovial fluid is a lubricant that is found in
| A. Human bone joints. |
| B. Gearboxes. |
| C. IC engines. |
| D. Rolling element bearings. |
(A)
(B)
(C)
(D)
Question 4: Which one of them is a correct combination?
1. Boundary lubrication.
2. Hydrodynamic lubrication.
3. Mixed lubrication.
4. Elastohydrodynamic lubrication.
(i) Dimensionless film thickness < 1.
(ii) Dimensionless film thickness lies between 1 and 3.
(iii) Dimensionless film thickness lies between 3 & 5.
(iv) Dimensionless film thickness is greater than 5.
| A. 1-(i), 2-(iv), 3-(ii), 4-(iii). |
| B. 1-(iv), 3-(iii), 2-(i), 4-(ii). |
| C. 2-(i), 3-(iv), 4-(iii), 1-(ii). |
| D. 3-(iv), 2-(iii), 1-(i), 4-(ii). |
(A)
(B)
(C)
(D)
Question 5: As the temperature is increased, the coefficient of friction
| A. Increases. |
| B. Reduces. |
| C. Remains unchanged. |
| D. Increase or decrease based on the lubrication regime. |
(A)
(B)
(C)
(D)
Question 6: Which of the following is a desirable property of boundary lubricant?
| A. Dissolvability in lubricating oils. |
| B. Affinity to metallic surfaces. |
| C. Low shear strength and high melting point. |
| D. All of above. |
(A)
(B)
(C)
(D)
Question 7: The major disadvantage with extreme pressure lubricants is
| A. Carcinogenic nature of the lubricant. |
| B. Low melting point. |
| C. It is ineffective. |
| D. All of above. |
(A)
(B)
(C)
(D)
Question 8: In hydrodynamic lubrication the major source of friction is
| A. Shearing of lubricant film. |
| B. Abrasion due to asperities on tribo-surfaces. |
| C. Abrasion of tribo-surfaces due to free particles. |
| D. All of the above. |
(A)
(B)
(C)
(D)
Question 9: Which of the following statements is true about viscosity?
| A. Dynamic viscosity is the ratio of shear stress to the resultant shear rate. |
| B. Kinematic viscosity is equal to dynamic viscosity divided by density. |
| C. The CGS unit of dynamic viscosity is Centipoise and CGS unit of kinematic viscosity is Centistokes. |
| D. All of above. |
(A)
(B)
(C)
(D)
Question 10: Film thickness in elastohydrodynamic lubrication depends on
| A. Applied load and relative velocity. |
| B. Lubricant properties. |
| C. Properties of contacting materials. |
| D. All of above. |
(A)
(B)
(C)
(D)
Question 11: Viscosity of multigrade oils
| A. Reduces with temperature but at higher sensitivity compare to monograde oil. |
| B. Increases with temperature but at higher sensitivity compare to monograde oil. |
| C. Reduces with temperature but at lower sensitivity compare to monograde oil. |
| D. Increases with temperature but at lower sensitivity compare to monograde oil. |
(A)
(B)
(C)
(D)
Question 12: Viscosity Index denotes
| A. Relationship between the dynamic and kinematic viscosities. |
| B. Sensitivity of lubricants viscosity with respect to temperature. |
| C. Both (a) and (b). |
| D. There is no sliding and only rolling motion involved between cage and balls. |
(A)
(B)
(C)
(D)
Question 13: Which of the following is true in modelling viscosity temperature relationship?
| A. Dynamic viscosity is expressed by Vogel relation. |
| B. Kinematic viscosity is expressed by Walther’s relation. |
| C. Both (a) & (b). |
| D. None of the above. |
(A)
(B)
(C)
(D)
Question 14: Viscosity Index of the mineral oil can be improved by?
| A. Removing aromatics components during refining stage. |
| B. Blending with high viscous index oils. |
| C. Using polymeric additives. |
| D. All of the above. |
(A)
(B)
(C)
(D)
Question 15: Which one is the common system for oil classification?
| A. SAE (Society of Automobile Engineers). |
| B. API (American Petroleum Institute). |
| C. ISO (International Organization for Standardization). |
| D. All of the above. |
(A)
(B)
(C)
(D)
Question 16: Barus relation, shows the relationship between
| A. Lubricant viscosity and temperature. |
| B. Lubricant viscosity and pressure. |
| C. Dynamic viscosity and kinematic viscosity. |
| D. Lubricant temperature and lubricant pressure. |
(A)
(B)
(C)
(D)
Question 17: Which of the following is not an advantage/benefit of solid lubricant?
| A. More effective at high loads. |
| B. Resistance to deterioration. |
| C. Good heat dissipation. |
| D. Highly stable in extreme temperature and environment. |
(A)
(B)
(C)
(D)
Question 18: Out of the following which is NOT an example of solid lubricant?
| A. Graphite lubricant. |
| B. Molybdenum Sulphite lubricant. |
| C. Polytetrafluoroethylene lubricant. |
| D. Multigrade lubricant. |
(A)
(B)
(C)
(D)
Question 19: Which of the following is/are the constituents of grease?
| A. Base oil. |
| B. Additive. |
| C. Thickness fibre. |
| D. All of above. |
(A)
(B)
(C)
(D)
Question 20: Which of the following is NOT the advantage of grease?
| A. Remains at application point and adhere to the surface. |
| B. Less frequent application needed. |
| C. Good for inclined/vertical shaft. |
| D. Good dissipation of heat. |
(A)
(B)
(C)
(D)
Question 21: The common friction modifiers used in grease is
| A. Tricresyl phosphate (TCP). |
| B. Dibenzyl disulphite. |
| C. Zinc dialbyl dithiophosphate (ZDDP). |
| D. Molybdenum disulphide. |
(A)
(B)
(C)
(D)
Question 22: Synthetic oils are used in aerospace applications because
| A. They can withstand very high range of temperature from -1200 F to 5000 F. |
| B. Very high shaft rpm of the order of 60,000 rpm. |
| C. They have shorter carbon chains which are more resistant to heat and stress. |
| D. All of the above. |
(A)
(B)
(C)
(D)
Question 23: Identify the INCORRECT statement about the additives.
| A. The purpose of dispersant is to suspend harmful products like dirt and sludge. |
| B. Anti-wear additives typically contain zinc and phosphorus compounds. |
| C. Anti-foaming agents tend to lower the surface tension between air and liquid to the point where bubbles collapse. |
| D. Pour point additives increase the pour point of the lubricants. |
(A)
(B)
(C)
(D)
Question 24: Apart from reducing friction and wear, the secondary purpose(s) of lubricants is/are
| A. Heat dissipation. |
| B. Reducing corrosion. |
| C. Both (a) & (b). |
| D. None of these. |
(A)
(B)
(C)
(D)
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