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. |
Calculate the shear modulus for steel in GPa, if given that young modulus is 215 GPa and possion’s ratio is 0.33? |
| A. | 40 GPa |
| B. | 50 GPa |
| C. | 80 GPa |
| D. | 100 GPa |
| Answer» D. 100 GPa | |
| 2. |
A strain gauge measurement made on the free aluminum surface indicates the principle strains 0.003 and 0.002. What are the principal stresses? (Given that poison’s ratio for aluminum=0.33, young modulus = 70 GPa) |
| A. | σ1=965 MPa, σ2=235 MPa |
| B. | σ1=857.8 MPa, σ2=125.86 MPa |
| C. | σ1=305 MPa, σ2=458 MPa |
| D. | σ1=287.5 MPa, σ2=233.96 MPa |
| Answer» E. | |
| 3. |
In case of plane strain, the strain(ε3=0) in one of the principal directions is zero, but the stress is non-zero (σ3 is nonzero) in this direction. σ3= _____________ |
| A. | ν (σ1+ σ2) |
| B. | E (1- ν2) (σ1+ σ2) |
| C. | σ1+σ2 |
| D. | {E/(1- ν2)} (σ1+ σ2) |
| Answer» B. E (1- ν2) (σ1+ σ2) | |
| 4. |
Which of the following relation is not correct? |
| A. | Δ={(1-2ν)/E}3σm |
| B. | K = E/3(1-2ν) |
| C. | G = E/2(1+ν) |
| D. | ν = {1+(2G/3K)} / {1- (2G/3K)} |
| Answer» E. | |
| 5. |
Bulk modulus or volumetric modulus of elasticity(K) is equal to ____________ |
| A. | τxy / σx |
| B. | γxy / σx |
| C. | σm / Δ |
| D. | Δ / σm |
| Answer» D. Δ / σm | |
| 6. |
Modulus of elasticity defines the relationship between shear stress and shear strain. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Consider a unit cube subjected to normal stress σx, σy, σz. Assume normal stress does not produce any shear stress on planes x, y, z. What will be the net strain along x direction? |
| A. | 1/E [σx-ν(σy+σz)] |
| B. | 1/E [σy-ν(σx+σz)] |
| C. | 1/E [σz-ν(σy+σx)] |
| D. | 1/E [σx] |
| Answer» B. 1/E [σy-ν(σx+σz)] | |
| 8. |
For most isotropic metal the value of Poisson’s ratio is equal to ___________ |
| A. | 0.5 |
| B. | 1 |
| C. | 0.33 |
| D. | 0 |
| Answer» D. 0 | |
| 9. |
The transverse strain is a constant fraction of the strain in the longitudinal direction. This ratio is known as __________ |
| A. | poisson’s ratio |
| B. | pilling-Bedworth ratio |
| C. | concentration ratio |
| D. | reduction ratio |
| Answer» B. pilling-Bedworth ratio | |
| 10. |
The tension force along x-direction produces extension along the x-axis; it also produces contraction in transverse y and z-directions. |
| A. | True |
| B. | False |
| Answer» B. False | |