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Sectioning, Mounting, Grinding, Surface Preparation, Technique for Polishing and Etching of Materials (including Electropolishing, tint etching etc.)

1. Arrange in the correct order for metallographic sample preparation.

a: Polishing-Grinding-Etching-Microscopy Explanation

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b: Grinding-Etching- Microscopy- Polishing Explanation

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c: Microscopy- Etching-Polishing- Grinding Explanation

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d: Grinding – Polishing- Etching- Microscopy Explanation

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2. Types of etching possible on a sample

a: Swabbing Explanation

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b: Immersion Explanation

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c: Both Explanation

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d: None Explanation

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3. Choose the correct abrasive used for the cloth polishing.

a: CeO₂ Explanation

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b: Fe₂O₃ Explanation

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c: Mg₂O₃ Explanation

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d: Al₂O₃ Explanation

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4. The purpose of grinding is to

a: Etch the sample Explanation

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b: Remove the oxide layer damaged layer or uneven surfaces that might have formed during the last sectioning operation Explanation

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c: Create shallowed depth in the sample Explanation

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d: Cut the sample into different parts Explanation

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5. The most widely used cold mounting material is

a: Al₂O₃ Explanation

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b: Mg₂O₃ Explanation

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c: Epoxy resin Explanation

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d: All the above Explanation

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6. Which of the following is not a typical result of proper etching?

a: Enhanced visibility of grain boundaries Explanation

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b: Identification of different phases Explanation

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c: Reduced surface roughness Explanation

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d: Revelation of microstructural defects Explanation

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7. What is the primary purpose of etching in metallographic sample preparation?

a: To polish the sample surface Explanation

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b: To remove all impurities from the sample Explanation

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c: To reveal the microstructure by selectively attacking grain boundaries or phases Explanation

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d: To increase the hardness of the sample Explanation

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8. Electropolishing is typically considered?

a: Mechanical process Explanation

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b: Chemical-only process Explanation

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c: Electrochemical process Explanation

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d: Thermal process Explanation

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9. In electropolishing, the sample to be polished acts as the:?

a: Cathode Explanation

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b: Anode Explanation

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c: Electrolyte Explanation

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d: Ground Explanation

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