MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Phase Transformation knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For an ideal solution the diffusive coefficient in terms of atomic mobility is given as_______ |
| A. | D = MRT |
| B. | D = M/RT |
| C. | D = M/T |
| D. | D = M+RT |
| Answer» C. D = M/T | |
| 2. |
Mobility in terms of drift velocity and driving force can be described as __________ |
| A. | V/F |
| B. | F*V |
| C. | F+V |
| D. | F/V |
| Answer» B. F*V | |
| 3. |
If the atomic mobility is given as 5(sec/Kg) and the potential gradient is given as 4(Kg*m/sec ), Then calculate the drift velocity from the given data? (In m/sec) |
| A. | 1.25 |
| B. | 9 |
| C. | -20 |
| D. | 20 |
| Answer» D. 20 | |
| 4. |
Diffusion in the vicinity of the defects is affected by______ |
| A. | Concentration gradient and gradient of interaction energy |
| B. | Velocity |
| C. | Interaction energy and Speed of diffusion |
| D. | Gradient of potential energy and Composition |
| Answer» B. Velocity | |
| 5. |
What can be done to the strain energy if the atom is located near the dislocations? |
| A. | Can be reduced |
| B. | Can be increased |
| C. | Can be maintained at a constant value |
| D. | Cannot say |
| Answer» B. Can be increased | |
| 6. |
The atoms diffusing towards regions of high concentration can be found when diffusion occurs in the presence of an electric field or a temperature gradient. These are known as_____ |
| A. | Electro-migration and Thermo-migration |
| B. | Electric-migration and Thermal-migration |
| C. | Electro-migration and Thermal-migration |
| D. | Electric-migration and Thermo-migration |
| Answer» B. Electric-migration and Thermal-migration | |
| 7. |
The value of Atomic mobility is given as M and the potential gradient is given as ( u/ x) .Calculate the value of drift velocity? |
| A. | V = -M *( u/ x) |
| B. | V = M /( u/ x) |
| C. | V = M +( u/ x) |
| D. | V = M *( u/ x) |
| Answer» B. V = M /( u/ x) | |
| 8. |
The segregation of impurities such as Sb, Sn, P and As to grain boundaries in low-alloy steels produces____________ |
| A. | Ageing |
| B. | Strain hardening |
| C. | Temper embrittlement |
| D. | Red brittleness |
| Answer» D. Red brittleness | |
| 9. |
The diffusion of carbon or nitrogen to dislocations in mild steel is responsible for strain ageing and blue brittleness. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
The potential energy of the atom will then be relatively high due to the strain in the surrounding matrix. However, this strain energy can be reduced if the atom is located in a position where it better matches the space available. |
| A. | False |
| B. | True |
| Answer» C. | |