MCQOPTIONS
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MCQOPTIONS
This section includes 10 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 following curve represents the relation between the normalized creep rate with normalized stress. In which of the the region, the Harper-Dorn Creep law is valid? |
| A. | I |
| B. | II |
| C. | III |
| D. | Any |
| Answer» B. II | |
| 2. |
The below curve represents the relation between the normalized creep rate with normalized stress. In which of the following region the power law is valid? |
| A. | I |
| B. | II |
| C. | III |
| D. | Any |
| Answer» C. III | |
| 3. |
The Sellars-Tegart equation of creep rate determination is used during __________ |
| A. | very high stress |
| B. | very temperature |
| C. | low stress and low temperature |
| D. | low stress and high temperature |
| Answer» B. very temperature | |
| 4. |
At higher temperature, the lattice diffusion is predominant whereas at lower temperature diffusion along the dislocation core is predominant. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
Which equation describes the power law of creep? |
| A. | εs = Bσn exp(-Q/RT) |
| B. | εs = σn exp(-Q/RT) |
| C. | εs = exp(-Q/RT) |
| D. | εs = Bσn |
| Answer» B. εs = σn exp(-Q/RT) | |
| 6. |
The power-law relation is used for which type of creep mechanism? |
| A. | Dislocation glide |
| B. | Dislocation creep |
| C. | Diffusional Creep |
| D. | Grain boundary sliding |
| Answer» C. Diffusional Creep | |
| 7. |
The power-law relation is used to describe the ____________ |
| A. | creep elongation |
| B. | creep mechanism |
| C. | creep rate |
| D. | fracture behavior |
| Answer» C. creep rate | |
| 8. |
In the dislocation creep mechanism of the creep, the rate-controlling step is ____________ |
| A. | rate of recovery |
| B. | rate strain hardening |
| C. | atomic diffusion |
| D. | dislocation glide |
| Answer» D. dislocation glide | |
| 9. |
In a material, if several mechanisms are operating in series to creep the material, then the creep rate will be decided by the __________ |
| A. | slowest operating mechanism |
| B. | fastest operating mechanism |
| C. | sum of creep rate of all the mechanisms |
| D. | multiplication of creep rate of all the mechanisms |
| Answer» B. fastest operating mechanism | |
| 10. |
In a material, if several mechanisms are operating in parallel to creep the material, then the creep rate will be decided by the __________ |
| A. | slowest operating mechanism |
| B. | fastest operating mechanism |
| C. | sum of creep rate of all the mechanisms |
| D. | multiplication of creep rate of all the mechanisms |
| Answer» C. sum of creep rate of all the mechanisms | |