Tribology (MCQ : MODULE - 3)


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 Archardís 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)

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