Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part4 : 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.Materials after cold working are subjected to following process to relieve stresses |
| hot working |
| tempering |
| normalising |
| annealing |
| special heat treatment. |
7.Which is false statement about annealing. Annealing is done to |
| relieve stresses |
| harden steel slightly |
| improve machining characteristic |
| soften material |
| permit further cold working. |
8.Tungsten in steel |
| improves wear resistance, cutting ability and toughness |
| refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties |
| improves cutting ability and reduces hardenability |
| gives ductility, toughness, tensile strength and anticorrosion properties |
| raises its melting point. |
9.Dislocations in materials refer to the following type of defect |
| point defect |
| line defect |
| plane defect |
| volumetric defect |
| chemical defect. |
10.Vanadium in high speed steels |
| promotes decarburisation |
| provides high hot hardness |
| forms very hard carbides and thus in-creases wear resistance |
| promotes retention of austenite |
| increases toughness. |
More Engineering Materials QUESTIONS AND ANSWERS available in next pages
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