This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “ECM-Process Control”.
1. If there is a change in the selected machining conditions, it will have impact on which of the following?
a) Process accuracy
b) Surface finish
c) Process accuracy & Surface finish
d) None of the mentioned
View Answer
Explanation: Selected machining conditions should remain unchanged, because, it will have a direct impact on accuracy and surface finish.
2. Surface roughness depends on current density, which is affected by which of the following?
a) Tool feed rate
b) Gap voltage
c) Work piece material
d) All of the mentioned
View Answer
Explanation: Roughness depend on current density, which is affected by tool feed rate, gap voltage, work material, pH number, temperature, conductivity and pressure.
3. Machining conditions leading to high accuracy are associated with ________ surface roughness and ________ productivity.
a) Greater, greater
b) Smaller, greater
c) Greater, smaller
d) Smaller, smaller
View Answer
Explanation: Accuracy is associated with smaller surface roughness and greater machining productivity.
4. Non stationary behaviour of ECM is due to, which of the factors below?
a) Gas generation
b) Heating
c) Passivation
d) All of the mentioned
View Answer
Explanation: Non stationary behaviour of ECM is due to the inter electrode gap conditions such as gas generation, passivation, heating and other electrode reactions.
5. For large components, actual machining time constitutes to how much percentage of the total machining time?
a) Very low
b) Low
c) Medium
d) High
View Answer
Explanation: Actual machining time of large components constitutes to a high percentage of total machining time.
6. What happens to the product cycle time, if the machining performance is improved?
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
View Answer
Explanation: As the machining performance is improved, the time take for a product to complete its production cycle, decreases.
7. The cost of additional control hardware remain a _________ fraction of total machining cost.
a) Small
b) Large
c) Equal
d) None of the mentioned
View Answer
Explanation: Cost of additional control hardware is very less, which constitutes to a small fraction in total machining cost.
8. With an increase in unmanned machining hours, what happens to the efficiency of ECM?
a) Increases
b) Reduces
c) Decreases
d) Increase and then decrease
View Answer
Explanation: Increase in unmanned machining hours lead to a raise in efficiency of ECM.
9. State whether the 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
View Answer
Explanation: An increase in unmanned machining hours, enhances the process integration with CAD/CAM systems.
10. 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
View Answer
Explanation: Deterioration by sparking may cause irreparable damage to the work pieces.
Sanfoundry Global Education & Learning Series – Advanced Machining.
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