Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part1 : 16 to 20
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
16.The elastic stress strain behavior of rubber is |
| linear |
| non-linear |
| plastic |
| no fixed relationship |
| unpredictable behavior. |
17.Stress relaxation is- the phenomenon |
| in which parts are not loaded |
| in which stress remains constant on increasing load |
| in which deformation tends to loosen the joint and produces a stress reduced |
| stress reduces on increasing load |
| none of the above. |
18.A material is known as allotropic or polymorphic if it |
| has a fixed structure under all conditions |
| exists in several crystal forms at different temperatures |
| responds to heat treatment |
| has its atoms distributed in a random pattern |
| none of the above. |
19.The ultimate tensile strength of low carbon steel by working at a high strain rate will |
| decrease |
| increase |
| remain constant |
| first increase and then decrease |
| first decrease and then increase. |
20.Isotropic materials are those which have the same |
| elastic properties in all directions |
| stresses induced in all directions |
| thermal properties in all directions |
| electric and magnetic properties in all directions |
| density throughout. |
More Engineering Materials QUESTIONS AND ANSWERS available in next pages
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