Advanced Machining Questions and Answers – ECM – Equipment – 2

This set of Advanced Machining Processes Test focuses on “ECM-Equipment – 2”.

1. What are the main functions of electrolyte in Electrochemical machining?
a) Conduct machining current
b) Removal of debris
c) Maintaining constant temperature
d) All of the mentioned
View Answer

Answer: d
Explanation: Main functions of electrolyte are conducting machine current, removing the debris, carrying away the heat, maintaining constant temperature.

2. Electrolytic solution should ensure which type of anodic dissolution?
a) Uniform
b) Non-uniform
c) Low speed
d) None of the mentioned
View Answer

Answer: a
Explanation: Uniform and high speed anodic dissolution must be ensured by the electrolyte.

3. State whether the following statement is true or false regarding the electrolytic solution.
“In ECM, formation of passive film is recommended.”
a) True
b) False
View Answer

Answer: b
Explanation: Electrolytic solution should avoid formation of passive layers on anode.
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4. Which type of electrical conductivity is necessary for electrolytic solution?
a) Low
b) Medium
c) High
d) None of the mentioned
View Answer

Answer: c
Explanation: High electrical conductivity is needed for electrolytic solution in ECM.

5. What are the other features of electrolytic solution in ECM?
a) Non toxic
b) Less erosive
c) Less viscous
d) All of the mentioned
View Answer

Answer: d
Explanation: Electrolytic solution should be nontoxic, less viscous and less erosive.
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6. How much should be the electrolytic solution?
a) Highly expensive
b) Inexpensive
c) All of the mentioned
d) None of the mentioned
View Answer

Answer: b
Explanation: Electrolyte must be inexpensive and available at ease.

7. Which are the most common electrolytes used in Electrochemical machining?
a) Sodium chloride
b) Sodium nitride
c) Sodium hydroxide
d) All of the mentioned
View Answer

Answer: d
Explanation: Electrolytes such as sodium chloride, sodium nitride, sodium hydroxide are some of the electrolytes used in ECM.
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8. 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
View Answer

Answer: c
Explanation: Selection of electrolyte depend up on work piece material, dimensional tolerance, machining productivity and surface finish required.

9. 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
View Answer

Answer: b
Explanation: Temperature of electrolyte should range between 22 to 45oC.
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10. 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
View Answer

Answer: c
Explanation: Value of pressure of electrolytic solution must range between 100 to 200 kPa.

11. 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
View Answer

Answer: b
Explanation: Typical velocity of the electrolytic solution must range between 25 to 50 m/sec.

12. 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
View Answer

Answer: a
Explanation: Local metal removal rates are high at small gap locations in ECM.

13. 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
View Answer

Answer: a
Explanation: When the local metal removal rates are high then current density and efficiency are also high.

14. Current efficiency depends on which of the following in ECM?
a) Anodic material
b) Electrolyte
c) Anodic material & Electrolyte
d) None of the mentioned
View Answer

Answer: c
Explanation: Current efficiency in ECM depend on electrolyte and anodic material used.

15. State whether the following statement is true or false regarding the electrolytes in ECM.
“In Electrochemical machining, electrolytes should deposit on cathode electrodes.”
a) True
b) False
View Answer

Answer: b
Explanation: In ECM, electrolytes should not deposit on cathode, so that shape of electrode remains unchanged.

Sanfoundry Global Education & Learning Series – Advanced Machining.

To practice all areas of Advanced Machining for various tests, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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