Question

Which of the following options is the odd one?

• A. Electroplating
• B. Anodizing
• C. Powder Coating
• D. Drilling

Hint:

In questions involving technical terms, classify them by their fundamental purpose. Ask yourself: "Is this process adding material, removing material, changing the shape, or changing the properties of the material?" This will often reveal the underlying grouping.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
We need to identify the term that does not belong with the others from the given list of four industrial processes.
Step 2: Key Formula or Approach:
The approach is to understand the purpose of each process and group them based on their function. We are looking for the process that has a different function from the rest.
Step 3: Detailed Explanation:
Let's define each process:
- (A) Electroplating: This is a process that uses electric current to deposit a thin layer of one metal onto the surface of another metal. It's a surface coating technique used for decoration, corrosion resistance, or to improve hardness.
- (B) Anodizing: This is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts, particularly aluminum. It improves corrosion resistance and allows for dyeing (coloring). It is a surface treatment/coating process.
- (C) Powder Coating: This is a type of coating that is applied as a free-flowing, dry powder. The coated item is then cured under heat to form a hard finish that is tougher than conventional paint. It is a surface coating process.
- (D) Drilling: This is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section in solid materials. It is a subtractive manufacturing process, meaning it removes material.
The common theme for Electroplating, Anodizing, and Powder Coating is that they are all surface finishing or coating processes. Their purpose is to add a layer to or modify the surface of an object. In contrast, Drilling is a machining or material removal process.
Step 4: Final Answer:
Drilling is the odd one out because it is a process of removing material, whereas the other three are processes of adding or modifying a surface layer. This corresponds to option (D).