Quiz 29-Version W 7. What is case-hardening? 1. What determines the maximun pres
ID: 2268777 • Letter: Q
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Quiz 29-Version W 7. What is case-hardening? 1. What determines the maximun pressure at which a bearing material can operate? A. B. Toughness C. Hardness D. Heating A. Method used to toughen ceramic ball bear- B. Hardening of the exterkor of a steel compo- C. Method for improving the embeddability of D. Hardening method developed by the Case 8. Which is not an advantage of a soft bearing a steel component 2. According to the text, why do skis slide on snow Lock Company of New Haven with low friction? A. Ice asperities adhering to the ski are sbeared material? A. Boundary lubrication B. Resistance to wear off. B. Pressure melts the snow, creating a thin liq- C. Frictional heating melts the snow, creating D. Metal edges quickly conduct heat away from 9. What is ment by the conformability of a bear- uid layer beneath the ski. a thin liquid layer beneath the ski. the snow D. ing? A. High load-bearing ability B. Flexibility of the steel backing strip C. Use of an easily replaceable split shell 3. What can be done to reduce the friction of skis at very low temperatures? A. Add exposed metal edges to the skis. B. Coat the ski with a polymer such as PTFE C. Coat the ski with a lead-bronze bearing ma- Ability to adjust to minor misalignments 10. What determines the maximum velocity at which a bearing material can operate? A. Embeddability B. Toughness C. Hardness D. Heating terial. D. Increase the pressure to lower the ice melt- ing point. 4. What property of rubber explains why the work of compression is not completely recovered when the rubber relaxes to its original length? 11. Where is "low-loss" rubber used in automobile Anel B. Elasticity C. Ductility D. Creep tires, and why? A. In the tread, to improve skid resistance B. In the tread, to reduce frictional heating C. In the tire wall, to improve skid resistance D. In the tire wall, to reduce frictional heating 5. What is hydrodymamic lubrication? A. Lubrication by electromagnetic suspension B. Lubrication by a magnetohydrodynamic flow 12. Where is "high-hysteresis" ("high-loss") rubber Lubrication by a full viscous film betwonused in automobile tires, and why? two surfaces D. Labrication between two surfaces by adsorbedB. In the tread, to reduce frictional heating A. In the tread, to improve skid resistance active molecules C. In the tire wall, to improve skid resistance D. In the tire wall, to reduce frictional heating 6. What is boundary lubrication? A. Lubrication by electromagnetic suspension B. Lubrication by a magnetohydrodynamie Bow C. Lubrication by a full viscous film between two surfaces D. Lubrication between two surfaces by adsorbed active moleculesExplanation / Answer
1.Heating..so option D.
2.Low friction is due to the frictional heating.so option C.
3.By coating PTFE.. so option B.
6.Lubrication between two surfaces by absorbed active molecules. So option D.
7.Case hardening is process of hardening only the surface leaving interior soft. So option B.
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