MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Materials Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
___________ is a method of obtaining diverse properties by varying thermal histories of various regions. |
| A. | Selective Hardening |
| B. | Carbonitriding |
| C. | Annealing |
| D. | Austenizing |
| Answer» B. Carbonitriding | |
| 2. |
Flame hardening technique is suitable for ____________ |
| A. | Plain carbon steels |
| B. | Alloy steels |
| C. | Cast irons |
| D. | Pig iron |
| Answer» B. Alloy steels | |
| 3. |
How is the heating of surface done in flame hardening technique? |
| A. | Oxy-acetylene torch |
| B. | Carburizing flame |
| C. | Electrode |
| D. | Direct sunlight |
| Answer» B. Carburizing flame | |
| 4. |
____________IS_A_METHOD_OF_OBTAINING_DIVERSE_PROPERTIES_BY_VARYING_THERMAL_HISTORIES_OF_VARIOUS_REGIONS.?$ |
| A. | Selective Hardening |
| B. | Carbonitriding |
| C. | Annealing |
| D. | Austenizing |
| Answer» B. Carbonitriding | |
| 5. |
What is the hardness achieved by flame hardening? |
| A. | H<sub>RC</sub> 30-40 |
| B. | H<sub>RC</sub> 50-60 |
| C. | H<sub>RC</sub> 80-100 |
| D. | H<sub>RC</sub> 120-140 |
| Answer» C. H<sub>RC</sub> 80-100 | |
| 6. |
Which of the following is true for induction hardening? |
| A. | Requires less time |
| B. | Hardness and depth is difficult to control |
| C. | Only external surfaces can be hardened |
| D. | It gives a scaling effect |
| Answer» B. Hardness and depth is difficult to control | |
| 7. |
What is the frequency used for depths of 2 to 3 mm in induction hardening? |
| A. | 1200 Hz |
| B. | 3000 Hz |
| C. | 5400 Hz |
| D. | 9600 Hz |
| Answer» E. | |
| 8. |
How does induction hardening differ from flame hardening? |
| A. | Electric current is used |
| B. | Higher quenching time |
| C. | Low-temperature operation |
| D. | Results In fine grain structure |
| Answer» B. Higher quenching time | |
| 9. |
Which of the following is an application for flame hardening? |
| A. | Distortion occurs |
| B. | Expensive equipment |
| C. | Suitable for larger quantities |
| D. | Overheating causes cracks |
| Answer» E. | |
| 10. |
Flame hardening technique is suitable for____________ |
| A. | Plain carbon steels |
| B. | Alloy steels |
| C. | Cast irons |
| D. | Pig iron |
| Answer» B. Alloy steels | |
| 11. |
How is heating of surface done in flame hardening technique? |
| A. | Oxy-acetylene torch |
| B. | Carburizing flame |
| C. | Electrode |
| D. | Direct sunlight |
| Answer» B. Carburizing flame | |
| 12. |
Flame hardening can only be performed on steels with a minimum of ______ carbon. |
| A. | 0.4% |
| B. | 0.8% |
| C. | 1.2% |
| D. | 1.8% |
| Answer» B. 0.8% | |