Materials Science and Manufacturing Engineering Miscellaneous
- Flash and gutter are provided in drop forging dies at the following stage:
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Finishing
Correct Option: C
Finishing
- Cold shut (lap) may occur in products obtained by
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Casting when molten metal is not able to reach in corners.
Correct Option: E
Casting when molten metal is not able to reach in corners.
- Consider the following steps in forging a connecting rod from the bar stock
1. blocking
2. trimming
3. finishing
4. edging
Select the correct sequence of these operations using the codes given below:
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Edging – blocking – Finishing – Trimming.
Correct Option: D
Edging – blocking – Finishing – Trimming.
- Cold working produces the following effects
1. Stresses are set up in the material
2. Grain structure get distorted
3. Strength and hardness of the metal are increased
4. Surface finish is reduced
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Stress are build up due to strain hardening & Grain structure distortion.
Correct Option: A
Stress are build up due to strain hardening & Grain structure distortion.
- An annealed copper wire of 25 mm diameter is drawn into a wire of 5 mm diameter. The average yield stress in this operation if the curve of the material is given, σ = 315 ε 0.54 MPa
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True strain
ε = In Ai = In di = In 25 Af df 5
ε = 3.22
σ = 315 ε0.54 = 315 (3.22)0.54
σ 592 MPaCorrect Option: A
True strain
ε = In Ai = In di = In 25 Af df 5
ε = 3.22
σ = 315 ε0.54 = 315 (3.22)0.54
σ 592 MPa