MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In Magnetic abrasive finishing, which of the following particles do not contribute to the material removal? |
| A. | abrasive particles |
| B. | magnetic particles |
| C. | non-magnetic particles |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 2. |
Which of the following type of tools, are required for magnetic field assisted polishing? |
| A. | rigid tools |
| B. | expensive tools |
| C. | magnetic tools |
| D. | ultra precession tools |
| Answer» D. ultra precession tools | |
| 3. |
Pumping of electrolyte through the narrow gaps causes, which type of forces on tool and work piece? |
| A. | large |
| B. | small |
| C. | negligible |
| D. | no force |
| Answer» B. small | |
| 4. |
Electro chemical machining process cannot produce which of the following mentioned below? |
| A. | drilled holes |
| B. | deburred edges |
| C. | sharp edges |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 5. |
State whether the following statement is true or false regarding the limitations of ECM. “In electrochemical machining, duplicating the tool is easier.†|
| A. | true |
| B. | false |
| Answer» C. | |
| 6. |
How are material removal rates of ECM, when compared to that of conventional methods? |
| A. | slower |
| B. | faster |
| C. | same |
| D. | none of the mentioned |
| Answer» B. faster | |
| 7. |
How much amount of energy is consumed in Electro chemical machining? |
| A. | very small |
| B. | small |
| C. | medium |
| D. | large |
| Answer» E. | |
| 8. |
Which of the following are the limitations of electro chemical machining? |
| A. | removal of hydrogen |
| B. | handling the electrolyte |
| C. | energy consumption |
| D. | all of the mentioned |
| Answer» E. | |
| 9. |
What are the requirements of labour for machining purpose in Electrochemical machining? |
| A. | low |
| B. | medium |
| C. | high |
| D. | very high |
| Answer» B. medium | |
| 10. |
Which of the following materials can be machined using ECM? |
| A. | hard nonconductive materials |
| B. | hard conductive materials |
| C. | all nonconductive materials |
| D. | none of the mentioned |
| Answer» C. all nonconductive materials | |
| 11. |
Compared to other processes, machining is done at                      voltages for high rates of material removal. |
| A. | low |
| B. | medium |
| C. | high |
| D. | very low |
| Answer» D. very low | |
| 12. |
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. | passive layer on machined parts & cathode |
| D. | none of the mentioned |
| Answer» B. passive layer on cathode | |
| 13. |
130 mm. |
| A. | ± 0.01 mm |
| B. | ± 0.025 mm |
| C. | ± 0.13 mm |
| D. | ± 0.25 mm |
| Answer» E. | |
| 14. |
Fine dimensional control can be obtained if throwing power of electrolyte is |
| A. | low |
| B. | medium |
| C. | high |
| D. | very high |
| Answer» B. medium | |
| 15. |
What happens when the current density is low in ECM? |
| A. | pitting occurs |
| B. | etching occurs |
| C. | pitting & etching occurs |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 16. |
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 | |
| 17. |
For high process accuracy, which of the following factors are needed? |
| A. | high feed rate |
| B. | high conductivity |
| C. | high feed rate & high conductivity |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 18. |
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 | |
| 19. |
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 | |
| 20. |
Which properties of electrolyte does not affect the accuracy of the process? |
| A. | temperature |
| B. | concentration |
| C. | non-reactive |
| D. | pressure |
| Answer» D. pressure | |
| 21. |
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. | |
| 22. |
Which type of gap width is necessary for a higher degree of accuracy? |
| A. | very small |
| B. | small |
| C. | medium |
| D. | high |
| Answer» C. medium | |
| 23. |
In Electrochemical machining, larger grain size causes which type of finish? |
| A. | smoother |
| B. | rougher |
| C. | finer |
| D. | all of the mentioned |
| Answer» C. finer | |
| 24. |
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 | |
| 25. |
For a better surface finish, which type of current distribution is required? |
| A. | even |
| B. | uneven |
| C. | even & uneven |
| D. | none of the mentioned |
| Answer» B. uneven | |
| 26. |
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. | |
| 27. |
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 | |
| 28. |
When machining Ti, in Nacl electrolyte, what values of current efficiencies are obtained? |
| A. | 10 – 20 % |
| B. | 20 – 30 % |
| C. | 30 – 50 % |
| D. | 50 – 80 % |
| Answer» B. 20 – 30 % | |
| 29. |
State whether the following statement is true or false about electrolyte in ECM. “Machinability in ECM is enhanced, when electrolyte is heated.†|
| A. | true |
| B. | false |
| Answer» B. false | |
| 30. |
When the electrolyte flow is low, what happens to the current efficiency? |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | increase and then decrease |
| Answer» C. remains same | |
| 31. |
For alloys, which type of electrolyte is used in ECM? |
| A. | single component |
| B. | double component |
| C. | multi component |
| D. | triple component |
| Answer» D. triple component | |
| 32. |
Nickel can be machined with 100% current efficiency, when current density value is |
| A. | 10 a/cm2 |
| B. | 25 a/cm2 |
| C. | 45 a/cm2 |
| D. | 80 a/cm2 |
| Answer» C. 45 a/cm2 | |
| 33. |
Better surface finish and higher accuracy depend on which of the factors below? |
| A. | chemical composition of the electrolyte |
| B. | current density |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 34. |
Electro chemical dissolution phase starts with the movement of ions between which two components? |
| A. | cathode and anode |
| B. | cathode and power source |
| C. | power source and anode |
| D. | power source and electrolyte |
| Answer» B. cathode and power source | |
| 35. |
Too small gap causes which of the following effects? |
| A. | sparking |
| B. | short circuit |
| C. | sparking & short circuit |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 36. |
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 | |
| 37. |
At constant gap thickness material removal becomes equal to feed rate. What is this gap called? |
| A. | equal gap |
| B. | equilibrium gap |
| C. | unique gap |
| D. | narrow gap |
| Answer» C. unique gap | |
| 38. |
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 | |
| 39. |
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 | |
| 40. |
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 | |
| 41. |
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 | |
| 42. |
State whether the 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 | |
| 43. |
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. | |
| 44. |
In 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 | |
| 45. |
Current efficiency depends on which of the following in ECM? |
| A. | anodic material |
| B. | electrolyte |
| C. | anodic material & electrolyte |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 46. |
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 | |
| 47. |
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 | |
| 48. |
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 | |
| 49. |
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 | |
| 50. |
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 | |