MCQOPTIONS
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MCQOPTIONS
This section includes 106 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. |
ECM is usually characterized as low accuracy machining, for which of the following reason? |
| A. | Narrow gap width |
| B. | Wider gap width |
| C. | High current densities |
| D. | All of the mentioned |
| Answer» C. High current densities | |
| 2. |
Which of the following processes can be done using ECM? |
| A. | Die sinking |
| B. | Profiling and contouring |
| C. | Drilling and trepanning |
| D. | All of the mentioned |
| Answer» E. | |
| 3. |
ECM is used to _____ the sharp edges produced after rough cuts? |
| A. | Enhance |
| B. | Dull |
| C. | Improve |
| D. | None of the mentioned |
| Answer» C. Improve | |
| 4. |
Micro ECM is used to machine which type of parts? |
| A. | Large parts |
| B. | Micro parts |
| C. | Normal sized parts |
| D. | All of the mentioned |
| Answer» C. Normal sized parts | |
| 5. |
Which of the following material cannot be machined using ECM? |
| A. | High strength alloys |
| B. | Hardened steels |
| C. | Nonconductive materials |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 6. |
Which of the following produces small indents and cavities using micro ECM? |
| A. | Moving the work piece |
| B. | Switching the pulse current |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 7. |
Which of the following use ECM for different applications? |
| A. | Gas turbines |
| B. | Jet engines |
| C. | Bio medical implants |
| D. | All of the mentioned |
| Answer» E. | |
| 8. |
In micro ECM, which of the following is used as micro tool? |
| A. | Electrolyte jet |
| B. | Electrodes |
| C. | Power supply |
| D. | All of the mentioned |
| Answer» B. Electrodes | |
| 9. |
Which type of damage is caused by deterioration which is caused by spark? |
| A. | Reparable |
| B. | Irreparable |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |
| 10. |
If there is an increase in the electrolyte flow, what happens to the rate of film formation? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | All of the mentioned |
| Answer» C. Remains same | |
| 11. |
What are the typical dimensional tolerances obtained in ECM when there is proper control of machining? |
| A. | ± 0.01 mm |
| B. | ± 0.025 mm |
| C. | ± 0.13 mm |
| D. | ± 0.25 mm |
| Answer» C. ± 0.13 mm | |
| 12. |
What happens when current density is low in ECM? |
| A. | Pitting occurs |
| B. | Etching occurs |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 13. |
Tool insulation that _____ the side machining action is needed in the process of ECM. |
| A. | Limits |
| B. | Enhances |
| C. | Maintains |
| D. | None of the mentioned |
| Answer» B. Enhances | |
| 14. |
If the current density is high as required, what type of machining occurs? |
| A. | Pitting |
| B. | Polishing |
| C. | Etching |
| D. | All of the mentioned |
| Answer» C. Etching | |
| 15. |
It is difficult to machine inner radii smaller than ______ and outer radii less than ____ in ECM. |
| A. | 0.1 mm, 0.2 mm |
| B. | 0.5 mm, 0.8 mm |
| C. | 0.8 mm, 0.5 mm |
| D. | 0.2 mm, 0.1 mm |
| Answer» D. 0.2 mm, 0.1 mm | |
| 16. |
What are the tolerance values for the side gap in ECM? |
| A. | ± 0.01 mm |
| B. | ± 0.025 mm |
| C. | ± 0.13 mm |
| D. | ± 0.25 mm |
| Answer» E. | |
| 17. |
What are the typical dimensional tolerances for frontal gaps in ECM? |
| A. | ± 0.01 mm |
| B. | ± 0.025 mm |
| C. | ± 0.13 mm |
| D. | ± 0.25 mm |
| Answer» D. ± 0.25 mm | |
| 18. |
Passivation is done on electrolytes in order to form which of the following? |
| A. | Passive layer on machined parts |
| B. | Passive layer on cathode |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» B. Passive layer on cathode | |
| 19. |
Fine dimensional control can be obtained if throwing power of electrolyte is ____. |
| A. | Low |
| B. | Medium |
| C. | High |
| D. | Very high |
| Answer» B. Medium | |
| 20. |
State whether following statement is true or false regarding the process control of ECM.'In Electrochemical machining, increase in unmanned machining hours reduces the possibility of integration of process with CAD/CAM systems.' |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
What is the value of overcut that is obtained using ECM? |
| A. | 0.3 mm |
| B. | 0.5 mm |
| C. | 0.7 mm |
| D. | 0.9 mm |
| Answer» C. 0.7 mm | |
| 22. |
Which properties of electrolyte does not affect the accuracy of the process? |
| A. | Temperature |
| B. | Concentration |
| C. | Non-reactive |
| D. | Pressure |
| Answer» D. Pressure | |
| 23. |
Between which values does the frontal gap's surface roughness vary? |
| A. | 0.02 to 0.13 µm |
| B. | 0.30 to 1.90 µm |
| C. | 1.93 to 2.64 µm |
| D. | 2.73 to 4.26 µm |
| Answer» C. 1.93 to 2.64 µm | |
| 24. |
What must be the working voltage in Electrochemical machining? |
| A. | 10 V |
| B. | 20 V |
| C. | 30 V |
| D. | 40 V |
| Answer» C. 30 V | |
| 25. |
For high process accuracy, which of the following factors are needed? |
| A. | High feed rate |
| B. | High conductivity |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 26. |
Accuracy of machining is affected by, which of the following factors? |
| A. | Material |
| B. | Gap voltage |
| C. | Feed rate |
| D. | All of the mentioned |
| Answer» E. | |
| 27. |
For a better surface finish, which type of current distribution is required? |
| A. | Even |
| B. | Uneven |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» B. Uneven | |
| 28. |
Between which values does the side gap's surface roughness vary? |
| A. | >1 µm |
| B. | >3 µm |
| C. | >5 µm |
| D. | >7 µm |
| Answer» D. >7 µm | |
| 29. |
Surface roughness depend on which of the following quantities? |
| A. | Crystallographic irregularities |
| B. | Alloy composition |
| C. | Distribution of current density |
| D. | All of the mentioned |
| Answer» E. | |
| 30. |
Which type of gap width is necessary for higher degree of accuracy? |
| A. | Very small |
| B. | Small |
| C. | Medium |
| D. | High |
| Answer» C. Medium | |
| 31. |
Selection of electrolyte does not depend on which of the following factors? |
| A. | Work piece material |
| B. | Dimensional tolerance |
| C. | Heat affected zones |
| D. | Machining productivity |
| Answer» D. Machining productivity | |
| 32. |
Which type of electrical conductivity is necessary for electrolytic solution? |
| A. | Low |
| B. | Medium |
| C. | High |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 33. |
How much should be the electrolytic solution? |
| A. | Highly expensive |
| B. | Inexpensive |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |
| 34. |
What must be the value of electrolytic temperature in ECM? |
| A. | 2 to 14oC |
| B. | 22 to 45oC |
| C. | 46 to 57oC |
| D. | 62 to 76oC |
| Answer» C. 46 to 57oC | |
| 35. |
What must be the value of the pressure of electrolytic solution used in ECM? |
| A. | 1 to 10 kPa |
| B. | 10 to 80 kPa |
| C. | 100 to 200 kPa |
| D. | 300 to 400 kPa |
| Answer» D. 300 to 400 kPa | |
| 36. |
What must be the value of velocity of the electrolytic solution? |
| A. | 10 to 15 m/s |
| B. | 25 to 50 m/s |
| C. | 60 to 100 m/s |
| D. | 120 to 200 m/s |
| Answer» C. 60 to 100 m/s | |
| 37. |
What the most common electrolytes used in Electrochemical machining? |
| A. | Sodium chloride |
| B. | Sodium nitride |
| C. | Sodium hydroxide |
| D. | All of the mentioned |
| Answer» E. | |
| 38. |
What are the other features of electrolytic solution in ECM? |
| A. | Non toxic |
| B. | Less erosive |
| C. | Less viscous |
| D. | All of the mentioned |
| Answer» E. | |
| 39. |
When local metal removal rates are high, how will be the current density and current efficiency? |
| A. | High |
| B. | Medium |
| C. | Low |
| D. | Very low |
| Answer» B. Medium | |
| 40. |
Local metal removal rates are high at which gap locations mentioned below? |
| A. | Small gap |
| B. | Medium gap |
| C. | Large gap |
| D. | None of the mentioned |
| Answer» B. Medium gap | |
| 41. |
What is the approximate value of faraday's constant? |
| A. | 65,200 C |
| B. | 53,800 C |
| C. | 96,500 C |
| D. | 85,600 C |
| Answer» D. 85,600 C | |
| 42. |
During ECM drilling, decrease in feed rates lead to which type of machining gaps? |
| A. | Wider |
| B. | Narrow |
| C. | Small |
| D. | None of the mentioned |
| Answer» B. Narrow | |
| 43. |
If the gap thickness is greater than equilibrium thickness what will be MRR? |
| A. | MRR is less than feed rate |
| B. | MRR is greater than feed rate |
| C. | MRR is equal to feed rate |
| D. | None of the mentioned |
| Answer» B. MRR is greater than feed rate | |
| 44. |
State whether following statement is true or false regarding the working principles.'In ECM, grain boundary attacks remove the grains through electrolytic forces.' |
| A. | True |
| B. | False |
| Answer» B. False | |
| 45. |
Of the following ratios of metal dissolved amounts, which one represent the current efficiency? |
| A. | Observed to theoretical |
| B. | Theoretical to observed |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» B. Theoretical to observed | |
| 46. |
In ECM, gap increase proportional to which relation of time below? |
| A. | Square of time |
| B. | Square root of time |
| C. | Cube of time |
| D. | Cube root of time |
| Answer» C. Cube of time | |
| 47. |
Current efficiency depends on which of the following in ECM? |
| A. | Anodic material |
| B. | Electrolyte |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 48. |
State whether following statement is true or false regarding the electrolytes in ECM.'In Electrochemical machining, electrolytes should deposit on cathode electrodes.' |
| A. | True |
| B. | False |
| Answer» C. | |
| 49. |
Apparent current efficiency is due to which of the following factors? |
| A. | Choice of wrong valence |
| B. | Passivation of anodic surface |
| C. | Gas evolution at anode |
| D. | All of the mentioned |
| Answer» E. | |
| 50. |
At constant feed rates what happens to gap thickness? |
| A. | Increases |
| B. | Decreases |
| C. | Becomes constant |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |