Question 1: Zero wear increases performance because
| A. It causes polishing of surface. |
| B. Size of surface asperities increases. |
| C. It removes lubrication from the surface. |
| D. It increases load bearing capacity of the surface. |
(A)
(B)
(C)
(D)
Question 2: Which of the following is NOT true about measurable wear?
| A. Measurable wear is undesirable. |
| B. It can cause vibration and noise. |
| C. Measurable wear may roughen the surfaces. |
| D. It polishes the surfaces. |
(A)
(B)
(C)
(D)
Question 3: Which of the following is NOT true about pitting on the gear surface?
| A. It is a surface fatigue failure. |
| B. It occurs due to repeated loading of the tooth surface. |
| C. It occurs because contact stress exceeds than the surface fatigue strength of the material.
|
| D. It occurs because contact stress exceeds the compressive strength of material. |
(A)
(B)
(C)
(D)
Question 4: With increase in bearing clearance the load capacity of the bearing
| A. Increases. |
| B. Decreases. |
| C. Does not change. |
| D. First decreases and then increases. |
(A)
(B)
(C)
(D)
Question 5: Which among the following is not an adhesive wear mechanism?
| A. Galling
|
| B. Scoring. |
| C. Scuffing. |
| D. Polishing. |
(A)
(B)
(C)
(D)
Question 6: To minimize the sliding friction, shear strength of the lubricant compared to the shear strength of the tribo-surfaces should be:
| A. Higher. |
| B. Lower. |
| C. Insignificant. |
| D. Equal. |
(A)
(B)
(C)
(D)
Question 7: As per Archard’s wear equation, wear volume in adhesive wear is independent of
| A. Sliding distance of travel. |
| B. Load. |
| C. Hardness of the soft material. |
| D. Rolling distance. |
(A)
(B)
(C)
(D)
Question 8: Seizure refers to
| A. Binding and fastening together of the material. |
| B. Cracking on the surface. |
| C. Significant wear on the surface. |
| D. Significant plastic deformation. |
(A)
(B)
(C)
(D)
Question 9: Causes of seizure are
| A. Poor heat dissipation. |
| B. Poor lubrication. |
| C. Smaller clearances. |
| D. All of above. |
(A)
(B)
(C)
(D)
Question 10: The thickness of the oxide layer formed on the surface is dependent upon
| A. Rate of rupture of the oxide layer. |
| B. Time available to re-oxidise. |
| C. Rate of formation of oxide layer. |
| D. All of the above. |
(A)
(B)
(C)
(D)
Question 11: Scratching is a form of
| A. Abrasive wear. |
| B. Adhesive wear. |
| C. Corrosive wear. |
| D. Fatigue wear. |
(A)
(B)
(C)
(D)
Question 12: Wear rate is lesser in 3-body abrasion as compared to 2-body abrasion because
| A. Energy is consumed in rolling motion of free hard particles. |
| B. Only spherical asperities are involved in 3-body abrasion. |
| C. Size of the asperities is smaller in 3-body abrasion. |
| D. Generally hardness of free particles is very low. |
(A)
(B)
(C)
(D)
Question 13: The property of MR fluid is
| A. Viscosity thickening due to magnetic attraction among particles. |
| B. Viscosity thinning due to relative sliding. |
| C. Reduction in viscosity due to increase in temperature. |
| D. All of above. |
(A)
(B)
(C)
(D)
Question 14: Which of the following represents correct sequence of corrosive wear?
i. Mechanical sliding at interface.
ii. Chemical reaction and formation of a reaction product (oxide, chloride).
iii. Wearing away of reaction product film.
| A. (ii),(i),(iii) |
| B. (ii), (iii), (i) |
| C. (i), (iii), (ii) |
| D. (i), (ii), (iii) |
(A)
(B)
(C)
(D)
Question 15: Erosive wear is a function of
| A. Particle velocity. |
| B. Impact angle. |
| C. Size of abrasive. |
| D. All of above. |
(A)
(B)
(C)
(D)
Check Score