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 Ductile fracture depends strongly on strain rate compared with brittle fracture, which is relatively insensitive to strain rate. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The presence of notch in material will _______________ the ductile to brittle transition temperature of the material. |
| A. | increase |
| B. | decrease |
| C. | remain constant |
| D. | not dependent on notch |
| Answer» B. decrease | |
| 3. |
In the flow curve equation given below, if the value of strain hardening exponent is increased, what will be the effect on the ductility of material?σ=Kεn; Where n is strain hardening exponent. |
| A. | It increases |
| B. | It decreases |
| C. | It remains constant |
| D. | Not dependent on n |
| Answer» B. It decreases | |
| 4. |
The presence of second phase particle reduces the ductility of the material. The type of particle which has the least effect in lowering the ductility is __________ |
| A. | spherical precipitates |
| B. | platelike precipitates |
| C. | rodlike precipitates |
| D. | acicular precipitates |
| Answer» B. platelike precipitates | |
| 5. |
The ductility of true strain values _____________ with increase in second phase particles. |
| A. | increases |
| B. | decrease |
| C. | remains constant |
| D. | no relationship |
| Answer» C. remains constant | |
| 6. |
The preferred sites for void formation are inclusions, second-phase particles, or the fine oxide particles, while in pure metals it is grain-boundary triple points. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
The main cause of presence of dimple in ductile fracture surface is ___________ |
| A. | slip bands |
| B. | impurity atoms |
| C. | micro voids |
| D. | corrosion |
| Answer» D. corrosion | |
| 8. |
The crack growth in ductile material is by method of ______________ |
| A. | shearing |
| B. | void coalescence |
| C. | dislocation movement |
| D. | impurity segregation |
| Answer» C. dislocation movement | |
| 9. |
The formation of necking produces the state of _________________ |
| A. | triaxle stress |
| B. | biaxial stress |
| C. | uniaxial stress |
| D. | pure shear stress |
| Answer» B. biaxial stress | |
| 10. |
The necking begins when the ___________ |
| A. | true stress and engineering stress becomes equal |
| B. | true strain and engineering strain becomes equal |
| C. | the true strain becomes equal to the strain hardening coefficient |
| D. | strain hardening coefficient becomes equal to an engineering strain |
| Answer» D. strain hardening coefficient becomes equal to an engineering strain | |