Question 1: When two surfaces are placed in contact they touch only at points where asperities meet. Areas of all the contact spots constitute the real (true) area of contact. Which one of the following is INCORRECT?

A. Real area of contact depends on the apparent area of contact.

B. Real area of contact depends on the surface textures of contacting surfaces.

C. Real area of contact depends on the material properties of contacting surfaces.

D. Real area of contact depends on the interfacial loading on contacting surfaces.

(A)
(B)
(C)
(D)

Question 2: Archard’s theory is related to:

A. Wear

B. Friction

C. Lubrication

D. All of above

(A)
(B)
(C)
(D)

Question 3: Which one of following is INCORRECT?

A. Wear rate due to 3-body abrasion is always higher than 2-body abrasion.

B. In 2-body abrasion hard asperities act like cutting tools to remove materials from the surfaces.

C. To reduce the damage caused by 3-body abrasion, particles of approximately the operating clearance size range must be removed.

D. Abrasive wear occurs when harder material rubs against a softer material.

(A)
(B)
(C)
(D)

Question 4: Which one of the following is CORRECT?

A. Corrosive wear is defined as the degradation of materials in which both the corrosion and wear mechanisms are involved.

B. Corrosive wear occurs when the sliding in in mechanical contact of surfaceshappens in corrosive environment.

C. Corrosive wear occurs when there is a combination of a wear (abrasion, adhesion or similar rubbing) situation and a corrosive environment.

D. All of above.

(A)
(B)
(C)
(D)

Question 5: Which one of the following is INCORRECT?

A. Erosive wear is the material loss from a solid surface due to its mechanical interaction with impinging liquid.

B. Erosive wear is the material loss from a solid surface due to its mechanical interaction with impinging solid particles.

C. Erosive wear is the material loss from a solid surface due to its mechanical interaction with impinging solid particles suspended in the liquid.

D. None of above.

(A)
(B)
(C)
(D)

Question 6: Fretting wear is the loss of material from one or both the surfaces due to:

A. High frequency low amplitude vibrations.

B. High frequency high amplitude vibrations.

C. Low frequency high amplitude vibrations.

D. Low frequency low amplitude vibrations.

(A)
(B)
(C)
(D)

Question 7: Fatigue surface wear is caused by

A. Multiple reversal of contact stress.

B. Tensile loading.

C. Lubricants.

D. Purity of materials.

(A)
(B)
(C)
(D)

Question 8: Which of the following is the most severe mode of wear?

A. Three body abrasion.

B. Two body abrasion.

C. Adhesion.

D. Fatigue.

(A)
(B)
(C)
(D)

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