MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Behaviour knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Grain size strengthening can be understood by __________ |
| A. | Orowan mechanism |
| B. | Hall-Petch equation |
| C. | Schmid’s law |
| D. | Bragg’s law |
| Answer» C. Schmid’s law | |
| 2. |
Grain refinement decreases ductility of the material. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
The number of dislocations is directly proportional to ___ and inversely proportional to ___ |
| A. | Shear modulus, Burgers vector |
| B. | Shear modulus, Stress |
| C. | Stress, Shear modulus |
| D. | Burgers vector, Stress |
| Answer» D. Burgers vector, Stress | |
| 4. |
A material shows maximum strength when it consists of ____ dislocations. |
| A. | No |
| B. | Large number of |
| C. | Very less number of |
| D. | Intermediate number of |
| Answer» B. Large number of | |
| 5. |
Which property doesn’t improve on grain refinement? |
| A. | Fatigue strength |
| B. | Tensile strength |
| C. | Hardness |
| D. | Creep strength |
| Answer» E. | |
| 6. |
Which factor doesn’t promote fine grain structure? |
| A. | Fast cooling rates |
| B. | Inoculating agents |
| C. | Mechanical vibrations |
| D. | Longer holding times at high temperature |
| Answer» E. | |
| 7. |
THE_NUMBER_OF_DISLOCATIONS_IS_DIRECTLY_PROPORTIONAL_TO_____AND_INVERSELY_PROPORTIONAL_TO____?$ |
| A. | Shear modulus, Burgers vector |
| B. | Shear modulus, Stress |
| C. | Stress, Shear modulus |
| D. | Burgers vector, Stress |
| Answer» D. Burgers vector, Stress | |
| 8. |
Grain size strengthening can be understood by __________$ |
| A. | Orowan mechanism |
| B. | Hall-Petch equation |
| C. | Schmid’s law |
| D. | Bragg’s law |
| Answer» C. Schmid‚Äö√Ñ√∂‚àö√ë‚àö¬•s law | |
| 9. |
Grain_refinement_decreases_ductility_of_the_material.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
A coarse grained material shows better strength at higher temperatures. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
A material shows maximum strength when it consists of ____ dislocations? |
| A. | No |
| B. | Large number of |
| C. | Very less number of |
| D. | Intermediate number of |
| Answer» B. Large number of | |
| 12. |
Which property doesn’t improve on grain refinement?$ |
| A. | Fatigue strength |
| B. | Tensile strength |
| C. | Hardness |
| D. | Creep strength |
| Answer» E. | |
| 13. |
What term is used for the temperature at which the strength of grain boundary and strength of grain is equal? |
| A. | Equicohesive temperature |
| B. | Curie temperature |
| C. | Recrystallization temperature |
| D. | Hardening temperature |
| Answer» B. Curie temperature | |
| 14. |
Which symbol represents frictional stress in the Hall-Petch equation? |
| A. | σ<sub>0</sub> |
| B. | σ<sub>i</sub> |
| C. | K<sub>y</sub> |
| D. | d |
| Answer» C. K<sub>y</sub> | |
| 15. |
Hall-Petch equation gives the relation between grain size and ___ |
| A. | Toughness |
| B. | Ductility |
| C. | Yield strength |
| D. | Tensile strength |
| Answer» D. Tensile strength | |
| 16. |
What is the ASTM grain size number for 1024 grains per square inch at 100x magnification? |
| A. | 10 |
| B. | 11 |
| C. | 12 |
| D. | 13 |
| Answer» C. 12 | |
| 17. |
For ASTM grain size number 10, give the number of grains per square inch at a magnification of 100x. |
| A. | 512 |
| B. | 1024 |
| C. | 2048 |
| D. | 200 |
| Answer» B. 1024 | |
| 18. |
Which factor doesn’t promote fine grain structure? |
| A. | Fast cooling rates |
| B. | Inoculating agents |
| C. | Mechanical vibrations |
| D. | Longer holding times at high temperature |
| Answer» E. | |