250+ TOP MCQs on EP-Process Parameters and Answers

Advanced Machining Processes Multiple Choice Questions on “EP-Process Parameters”.

1. Of the following material removal mechanisms, material is removed by which one in EP?
a) Electrode dissolution
b) Corrosion
c) Abrasion
d) Erosion
Answer: a
Clarification: Anodic dissolution takes place in Electropolishing process.

2. Which of the following come under the process parameters of the Electropolishing?
a) Work piece material and condition
b) Current density
c) Applied voltage
d) All of the mentioned
Answer: d
Clarification: The process parameters of Electropolishing include current density, applied voltage, acid type, temperature original surface roughness, work piece condition and material.

3. Current density of the EP process generally varies between which of the following values?
a) 0.0001 – 0.001 A/cm²
b) 0.005 – 1.8 A/cm²
c) 1.9 – 2.532 A/cm²
d) 3.523 – 4.23 A/cm²
Answer: b
Clarification: Generally current density value used in EP process vary between 0.005 – 1.8 A/cm².

4. Which of the following are the work piece materials that can be machined using Electropolishing?
a) Carbon steel
b) Alpha brass
c) Phosphor bronze
d) All of the mentioned
Answer: d
Clarification: Different work piece materials that can be machined using EP are carbon steels, stainless steels, copper, alpha brass, nickel, phosphor bronze, aluminium, magnesium etc.

5. Which of the following electrolyte, can be used commonly for stainless steel, Cu, Ni and Mg?
a) HCLO₄
b) H₂PO₄
c) H₂SO₄
d) HNO₃
Answer: b
Clarification: H₂PO₄ is a common electrolyte used in the machining of Cu, Ni, Mg.

6. What is the electrolytic solution’s temperature when stainless steel is machined?
a) 50^o C
b) 80^o C
c) 120^o C
d) 150^o C
Answer: b
Clarification: Temperature of electrolytic solution used for machining stainless steel is 80^o C.

7. State whether the following statement is true or false regarding process parameters of EP.
“In EP, process parameters have a direct impact on surface quality and productivity of process.”
a) True
b) False
Answer: a
Clarification: In Electropolishing, parameters have a direct impact on quality of surface and productivity.

8. For machining of Cu material which of the following can be used as electrolytes?
a) H₂PO₄
b) H₂PO₄ and Na₂CrO₄
c) HCLO₄
d) HNO₃
Answer: a
Clarification: For Cu material electrolyte used in EP process is H₂PO₄.

9. In the following types of voltage, which one best suites EP process?
a) Randomly Fluctuating
b) Constant
c) Periodically fluctuating
d) None of the mentioned
Answer: b
Clarification: For the machining to take place in Electropolishing process, voltage should be correct and constant.

10. State whether the following statement is true or false regarding process parameters of EP.
“In EP, high current densities are used for anodic dissolution.”
a) True
b) False
Answer: b
Clarification: In Electropolishing, limited current densities are used for anodic dissolution.