MCQOPTIONS
Saved Bookmarks
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. |
To maintain the constant true strain rate of a sample, the crosshead velocity should increase with the increase in the length of the specimen. What will be the optimum velocity with the change in length to keep the true strain rate constant? (True strain rate= , L=length of sample, t=time). |
| A. | v= |
| B. | v= *L |
| C. | v= *L*exp( t) |
| D. | v= *L*exp( /t) |
| Answer» D. v= *L*exp( /t) | |
| 2. |
If the crosshead velocity of the machine is kept constant, the true strain rate of the sample will _________ with an increase in the length of the sample. |
| A. | increase |
| B. | decrease |
| C. | remain constant |
| D. | vary |
| Answer» C. remain constant | |
| 3. |
The true strain rate is given as , and conventional strain rate is given as . The engineering strain is equal to e. The relationship between conventional strain rate and true strain rate is _______ |
| A. | = |
| B. | = /e |
| C. | = /(1+e) |
| D. | = *e |
| Answer» D. = *e | |
| 4. |
The strain rate calculated from engineering strain and correct strain gives the same result. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
If the crosshead velocity of the UTM machine is v, the strain rate is given as , and the initial length of the sample is L, find the strain rate of the specimen in terms of crosshead velocity and sample length? |
| A. | v |
| B. | v/L |
| C. | L/v |
| D. | v*L |
| Answer» C. L/v | |
| 6. |
The low carbon steel does not show yield point phenomena, but if the strain rate is sufficiently high, the yield point might appear in the flow curve. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
The dependence of the flow stress on the strain rate is _________ |
| A. | more prominent at higher strain |
| B. | is more prominent at lower strain |
| C. | constant at all the strain values |
| D. | no relationship |
| Answer» C. constant at all the strain values | |
| 8. |
Increasing the strain rate ______________ the flow stress. |
| A. | increases |
| B. | decreases |
| C. | does not change |
| D. | no relationship |
| Answer» B. decreases | |
| 9. |
The dependence of the strain rate on the strength of the material _____________ with the increase in temperature. |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | no relationship |
| Answer» B. decreases | |
| 10. |
The unit of strain rate is ____________ |
| A. | sec |
| B. | sec<sup>-1</sup> |
| C. | sec<sup>-2</sup> |
| D. | unit less |
| Answer» C. sec<sup>-2</sup> | |