Mechanical Engineering : Machine Design QUESTIONS AND ANSWERS :: part2 : 6 to 10
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
6.At low temperatures (say 75�C) the notched-bar impact value of steel |
| increases markedly |
| decreases markedly |
| remains same |
| depends on heat treatment carried out |
| none of the above. |
7.Residual stress in materials |
| acts when external load is applied |
| becomes zero when external load is removed |
| is independent of external loads |
| is always harmful |
| is always beneficial. |
8.Which is correct statement ? Stress concentration in cyclic loading is |
| very serious in brittle materials and less serious in ductile materials |
| very serious in ductile materials and less serious in brittle materials |
| equally serious in both types of materials |
| seriousness would depend on other factors |
| none of the above. |
9.For steel, the ultimate strength in shear as compared to ultimate strength in tension is |
| same |
| 1/2 |
| 1/3 |
| 1/4 |
| 2/3 |
10.For applications involving high stresses in one direction only the following type of thread would be best suited |
| ISO metric thread |
| acme thread |
| square thread |
| buttress thread |
| British Association thread. |
More Machine Design QUESTIONS AND ANSWERS available in next pages
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