MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The hydrostatic stress influence the crack propagation but not the crack initiation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
The Hydrostatic stress __________________ the dislocation pileup in the material. |
| A. | increases |
| B. | decreases |
| C. | does not increase |
| D. | sometimes increases and then decreases |
| Answer» D. sometimes increases and then decreases | |
| 3. |
The hydrostatic component of stress exerts no __________ |
| A. | shear stress |
| B. | tensile stress |
| C. | compressive stress |
| D. | triaxial stress |
| Answer» B. tensile stress | |
| 4. |
The hydrostatic compressive state of stress __________ the fracture strength of the material. |
| A. | increases |
| B. | decreases |
| C. | does not alter |
| D. | no relationship |
| Answer» B. decreases | |
| 5. |
In the case of 3-dimension state of stress, if one of the stress values, say, principal stress direction becomes compressive, the fracture stress reduces significantly. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Which of the following does not influence the ductile to the brittle transition of a material? |
| A. | Stress state |
| B. | Temperature |
| C. | Strain rate |
| D. | Shape of specimen |
| Answer» E. | |
| 7. |
The fracture strain in the following diagram will be equal to ______ |
| A. | A |
| B. | B |
| C. | C |
| D. | Zero |
| Answer» D. Zero | |
| 8. |
The fracture of material occurs when the flow curve _______________ |
| A. | is under the fracture curve |
| B. | intersects the fracture curve |
| C. | is parallel to fracture curve |
| D. | is perpendicular to fracture curve |
| Answer» C. is parallel to fracture curve | |
| 9. |
In which way, the notch decreases the tendency of brittle failure? |
| A. | By producing high local stresses |
| B. | By introducing triaxial tensile state of stress |
| C. | By providing low local strain hardening and cracking |
| D. | By creating a local magnification to the strain rate |
| Answer» D. By creating a local magnification to the strain rate | |