MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Advanced Machining knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How are minimum energies required for plastics when compared to that required for metals? |
| A. | Lower than |
| B. | Higher than |
| C. | Same as |
| D. | None of the mentioned |
| Answer» B. Higher than | |
| 2. |
How much amount of incident radiation is reflected at lower power densities? |
| A. | 10 percent |
| B. | 20 percent |
| C. | 50 percent |
| D. | 90 percent |
| Answer» E. | |
| 3. |
Machining of LBM takes place when power density is ____________ than what is lost by conduction and radiation. |
| A. | Greater |
| B. | Smaller |
| C. | Lower |
| D. | Same as |
| Answer» B. Smaller | |
| 4. |
State whether the following statement is true of false regarding LBM.“In LBM, high intensity laser beams are recommended for more material.” |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
HOW_MUCH_AMOUNT_OF_INCIDENT_RADIATION_IS_REFLECTED_AT_LOWER_POWER_DENSITIES??$ |
| A. | 10 percent |
| B. | 20 percent |
| C. | 50 percent |
| D. | 90 percent |
| Answer» E. | |
| 6. |
Which of the following has high machining speeds in Laser Beam Machining?$ |
| A. | Metals |
| B. | Non metals |
| C. | Metal alloys |
| D. | All of the mentioned |
| Answer» C. Metal alloys | |
| 7. |
How are minimum energies required for plastics when compared to that required for metals?$ |
| A. | Lower than |
| B. | Higher than |
| C. | Same as |
| D. | None of the mentioned |
| Answer» B. Higher than | |
| 8. |
Reflectivity of the materials depends on which of the following factors? |
| A. | Wave length |
| B. | Properties of material |
| C. | Surface finish |
| D. | All of the mentioned |
| Answer» E. | |
| 9. |
What happens to the material removal rate when reflectivity is higher? |
| A. | Will decrease |
| B. | Will increase |
| C. | Will enhance |
| D. | Remains same |
| Answer» B. Will increase | |
| 10. |
Which of the following phenomenon take place before melting and evaporating in LBM? |
| A. | Conduction |
| B. | Reflection |
| C. | Absorption |
| D. | All of the mentioned |
| Answer» E. | |
| 11. |
Machining of LBM takes place when power density is ____ than what is lost by conduction and radiation. |
| A. | Greater |
| B. | Smaller |
| C. | Lower |
| D. | Same as |
| Answer» B. Smaller | |
| 12. |
What happens to the process efficiency if plasma plumes are formed in LBM? |
| A. | Increases |
| B. | Enhances |
| C. | Decreases |
| D. | Improves |
| Answer» D. Improves | |
| 13. |
State whether following statement is true of false regarding LBM. |
| A. | |
| B. | True |
| Answer» C. | |
| 14. |
What happens when the heat is diffused into bulk material? |
| A. | Phase change occurs |
| B. | Melting occurs |
| C. | Vaporization may take place |
| D. | All of the mentioned |
| Answer» E. | |
| 15. |
Physics of laser is very complex due to which of the reasons below? |
| A. | Scattering loss |
| B. | Reflection loss |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 16. |
What is the material removal mechanism of Laser beam machining process? |
| A. | Melt and evaporate |
| B. | Electro chemical corrosion |
| C. | Mechanical erosion of materials |
| D. | Electro chemical dissolution |
| Answer» B. Electro chemical corrosion | |