MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
Which of the following hardness is least affected by surface scratched and local inhomogeneity of the material? |
| A. | Brinell hardness |
| B. | Mayer hardness |
| C. | Rockwell hardness |
| D. | Vickers hardness |
| Answer» B. Mayer hardness | |
| 2. |
Suppose Brinell hardness measurement is made from a nonstandard ball of diameter 5 mm. If the load applied in 10 mm standard ball is 3000 kg, then what load should be applied on the 5 mm ball to get the consistent reading in hardness measurement? |
| A. | 500 kg |
| B. | 250 kg |
| C. | 750 kg |
| D. | 1500 kg |
| Answer» D. 1500 kg | |
| 3. |
A major load of 3000 kg is applied on steel, the diameter of ball is 10 mm and width of indentation is 2 mm. Find the Brinell hardness number of the given steel? |
| A. | 350.5 |
| B. | 589.25 |
| C. | 636.94 |
| D. | 452.2 |
| Answer» D. 452.2 | |
| 4. |
The unit of Brinell hardness number is ____________ |
| A. | kg |
| B. | kg/mm2 |
| C. | kg-mm |
| D. | unitless |
| Answer» C. kg-mm | |
| 5. |
The Brinell hardness number is given by:\(\frac{P}{(\frac{πD}{2})[D-\sqrt{(D^2-d^2)}]}\) Where P is load applied in kg,D-diameter of the ball, in mmd-diameter of the indentation, in mm |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
How is Brinell hardness measured? |
| A. | Using a dial gauge showing hardness reading |
| B. | The graph obtained from machine showing hardness |
| C. | Using an indentation profile which will be checked in a microscope for indentation diameter |
| D. | By checking the deformation of the ball |
| Answer» D. By checking the deformation of the ball | |
| 7. |
For hard materials, the indenter of the Brinell hardness tester is made of __________ |
| A. | steel |
| B. | diamond |
| C. | tungsten carbide |
| D. | copper |
| Answer» D. copper | |
| 8. |
The diameter of the steel ball used in Brinell hardness is ________ |
| A. | 10 mm |
| B. | 10 cm |
| C. | 1 mm |
| D. | 3.6 mm |
| Answer» B. 10 cm | |
| 9. |
The Brinell Hardness measurement is a concept based on __________ |
| A. | indentation |
| B. | shearing |
| C. | rebound |
| D. | scratch |
| Answer» B. shearing | |
| 10. |
The Shore hardness test measurement uses the concept of _____________ |
| A. | indentation |
| B. | deformation |
| C. | rebound |
| D. | scratch |
| Answer» D. scratch | |
| 11. |
Hardness of most metals fall in the range of __________ in Mohr’s scale. |
| A. | 1-3 |
| B. | 3-6 |
| C. | 4-8 |
| D. | 7-10 |
| Answer» D. 7-10 | |
| 12. |
The hardness value of martensite according to Mohr’s scale is ___________ |
| A. | 1 |
| B. | 10 |
| C. | 3 |
| D. | 7 |
| Answer» E. | |
| 13. |
The scratch hardness range is ______________ |
| A. | 1-10 |
| B. | 1-100 |
| C. | 10-1000 |
| D. | 100-110 |
| Answer» B. 1-100 | |
| 14. |
Which of the following is not a measurement method for hardness? |
| A. | Scratch hardness |
| B. | Indentation hardness |
| C. | Rebound hardness |
| D. | Elongation hardness |
| Answer» E. | |
| 15. |
The stress concentration and notch sensitivity are the same phenomena in the material. |
| A. | True |
| B. | False |
| Answer» C. | |