This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “ECM-Advantages and Disadvantages”.
1. What fraction of tool will always be in contact with the work piece?
a) Half
b) Full
c) No contact
d) Quarter
View Answer
Explanation: Tool does not have any contact with the work piece in Electro chemical machining.
2. How much amount of wear is present in the tool used in Electrochemical machining?
a) No wear
b) Low
c) Medium
d) High
View Answer
Explanation: The tool wear is absent in the tool used in ECM, since tool has no contact with the work piece.
3. Compared to other processes, machining is done at __________ voltages for high rates of material removal.
a) Low
b) Medium
c) High
d) very low
View Answer
Explanation: In ECM, machining is done at low voltages, when compared to other processes.
4. Very small dimensions, up to which value can be controlled using ECM?
a) 0.01 mm
b) 0.05 mm
c) 0.07 mm
d) 0.12 mm
View Answer
Explanation: Due to less electrode gap very small dimensions up to 0.05 mm can be controlled.
5. Complicated profiles can be machined in how many operations in Electrochemical machining?
a) Single
b) Double
c) Triple
d) Multiple
View Answer
Explanation: One of the main advantage of ECM is, complicated profiles can be machined in a single operation itself.
6. How much amount of thermal damage occurs to the work piece?
a) Small
b) Large
c) No thermal damage
d) Negligible amount
View Answer
Explanation: As the temperatures are very low, no thermal damage occurs to the work piece material.
7. 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
View Answer
Explanation: Hard conductive materials can be machined and nonconductive materials cannot be machined using ECM.
8. What are the requirements of labour for machining purpose in Electrochemical machining?
a) Low
b) Medium
c) High
d) Very high
View Answer
Explanation: In electrochemical machining, labour requirements are low compared to conventional or traditional machining practices.
9. How much amount of energy is consumed in Electro chemical machining?
a) Very small
b) Small
c) Medium
d) Large
View Answer
Explanation: Very huge amount of energy is required for ECM, which is nearly 100 times required for turning or drilling of steel.
10. 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
View Answer
Explanation: In ECM, rates of material removal are slow compared to conventional methods.
11. State whether the following statement is true or false regarding the limitations of ECM.
“In ECM, cleaning and oiling of work piece need not be done after machining.”
a) True
b) False
View Answer
Explanation: Work piece needs to be cleaned and oiled just after the machining is done.
12. 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
View Answer
Explanation: Removal of hydrogen, handling and containing the electrolyte and energy consumption are some of the limitations of ECM.
13. 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
View Answer
Explanation: Duplication of tool is difficult in ECM, since it has side machining effects.
14. 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
View Answer
Explanation: Electro chemical machining cannot produce sharp internal or external edges.
15. 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
View Answer
Explanation: Electrolyte pumping through the narrow gaps gives rise to a large amount of forces on tool and work pieces.
Sanfoundry Global Education & Learning Series – Advanced Machining Processes.
To practice all areas of Advanced Machining Processes, here is complete set of 1000+ Multiple Choice Questions and Answers.
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