This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EP-Applications and Limitations”.
1. For economical and high quality Electropolishing, which of the following materials are used?
a) Cold rolled metals
b) Hot flat metals
c) Hot plastics
d) All of the mentioned
View Answer
Explanation: Cold rolled metals are the most important materials for economical and high quality polishing.
2. State whether the following statement is true or false about applications of EP.
“In EP, cast items do not maintain the texture of sand mold.”
a) True
b) False
View Answer
Explanation: Cast items usually maintain the texture of sand mold since they have coarse grains and include alloying elements.
3. Which of the following cannot be removed by using Electropolishing process?
a) Scales
b) Distortion
c) Coarse texture
d) Burrs
View Answer
Explanation: Coarse texture cannot be removed using Electropolishing as they produce rough surfaces.
4. Electropolishing prepares surfaces for which of the following processes?
a) Electron Beam machining
b) Electro plating
c) Laser beam machining
d) Magnetic Abrasive machining
View Answer
Explanation: EP prepares surfaces for electroplating, which creates an opportunity for best adherence.
5. For which of the following components, polishing can be done using EP?
a) Electrical conduits
b) Outlet boxes
c) Medical equipment
d) All of the mentioned
View Answer
Explanation: Polishing light fixtures of electrical conduits, outlet boxes, and medical, surgical, and food processing equipment.
6. State whether the following statement is true or false regarding the applications of EP.
“Using Electropolishing, deburring and breaking sharp edges can be done.”
a) True
b) False
View Answer
Explanation: Deburring and breaking sharp edges obtained from hand filing, grinding and honing of tools.
7. Electropolishing removes scales and distortions that are produces by which of the processes below?
a) Annealing
b) Nitriding
c) Carburizing
d) All of the mentioned
View Answer
Explanation: Scales and distortions produced by annealing, carburizing, nitriding, welding and soldering can be removed using EP.
8. State whether the following statement is true or false about applications of EP.
“In EP, removal of hardness and stressed surface layers, reduces life of parts.”
a) True
b) False
View Answer
Explanation: Removal of hardness and stressed surface layers improves the surface life of part.
9. Polishing of how many parts can be done using Electropolishing?
a) One part
b) Two parts
c) Multiple parts
d) None of the mentioned
View Answer
Explanation: Multiple parts can be polished simultaneously using EP, depending upon the size of parts.
10. Electropolishing cannot cover up which type of defects?
a) Burrs on surfaces
b) Scales and distortions
c) Non-metallic inclusions
d) Metallographic examination
View Answer
Explanation: Seams and non-metallic inclusions are some defects which cannot be covered up using EP.
11. Which of the following is a limitation of EP process?
a) Rough scratches removal
b) Scales removal
c) Distortions removal
d) Burr removal
View Answer
Explanation: In EP, rough scratches cannot be removed even by considerable amount of process.
12. Metals containing which of the following chemicals will be troublesome in EP process?
a) Silicon
b) Lead
c) Sulphur
d) All of them mentioned
View Answer
Explanation: All the elements mentioned above, if present in metals, will be troublesome in EP process.
13. State whether the following statement is true or false regarding the limitations of EP.
“In EP, base metal condition does not affect the process.”
a) True
b) False
View Answer
Explanation: Base metal condition affects the process of EP.
14. Which of the following defects lead to poor electropolishing of the surfaces?
a) Improper annealing
b) Non-metallic inclusions
c) Over pickling
d) All of the mentioned
View Answer
Explanation: Non-metallic inclusions, over pickling, large grain size, direction roll marks, improper cold reduction leads to poor electro polishing.
15. Electropolishing is more suited for, removal of which of the following defects?
a) Small scratches
b) Imperfections
c) Smoothing
d) All of the mentioned
View Answer
Explanation: Small scratches and imperfections can be easily removed when compared to that of rough scratches.
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