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. |
In the case of plane strain, the relationship between the fracture toughness and crack extension force is given as _______ (where K is the fracture toughness, δ is the crack extension force, ν is the poison’s ratio, and E is the young’s modulus). |
| A. | K=δE |
| B. | K2=δE/(1-ν2) |
| C. | K=(δE)/ν |
| D. | K=δ/E |
| Answer» C. K=(δE)/ν | |
| 2. |
In the case of plane stress, the relationship between the fracture toughness and crack extension force is given as _______ (where K is the fracture toughness, δ is the crack extension force, and E is the young’s modulus). |
| A. | K=δE |
| B. | K2=δE |
| C. | K=(δE)2 |
| D. | K=δ/E |
| Answer» C. K=(δE)2 | |
| 3. |
The plane-strain value of critical stress intensity factor KIc is independent of the specimen thickness and describes the fracture toughness of the durable material. Here, in the KIc the I represents _____ |
| A. | mode of fracture |
| B. | number of stress state |
| C. | number of strain state |
| D. | the magnitude of fracture toughness |
| Answer» B. number of stress state | |
| 4. |
In the Crack Opening Mode-I, the extreme case is the thick plate which shows the condition of ____________ |
| A. | plane stress |
| B. | plane strain |
| C. | uniaxial stress |
| D. | uniaxial strain |
| Answer» C. uniaxial stress | |
| 5. |
In the Crack opening Mode-I, the extreme case is the thin plate which shows the condition of ____________ |
| A. | plane stress |
| B. | plane strain |
| C. | uniaxial stress |
| D. | uniaxial strain |
| Answer» B. plane strain | |
| 6. |
The following diagram shows crack deformation mode. Which mode of fracture is shown? |
| A. | Mode-I |
| B. | Mode-II |
| C. | Mode-III |
| D. | Need more information |
| Answer» B. Mode-II | |
| 7. |
In determining the fracture toughness, the Mode-III is defined as the _____________ |
| A. | crack opening mode |
| B. | forward shear mode |
| C. | parallel shear mode |
| D. | perpendicular shear mode |
| Answer» D. perpendicular shear mode | |
| 8. |
In determining the fracture toughness, the Mode-II is defined as the _____________ |
| A. | crack opening mode |
| B. | forward shear mode |
| C. | parallel shear mode |
| D. | perpendicular shear mode |
| Answer» C. parallel shear mode | |
| 9. |
In determining the fracture toughness, the Mode-I is defined as _____________ |
| A. | crack opening mode |
| B. | forward shear mode |
| C. | parallel shear mode |
| D. | perpendicular shear mode |
| Answer» B. forward shear mode | |
| 10. |
The value of the geometric parameter for a plate of width w loaded in tension with the centrally loaded crack of the length 2a __________ |
| A. | [w/2π tan(πa/w)]1/2 |
| B. | [wtan(πa/w)]1/2 |
| C. | [w/2π tan(πa/w)] |
| D. | [w/2π] |
| Answer» B. [wtan(πa/w)]1/2 | |