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QUANTITATIVE TECHNIQUES FOR GRAIN SIZE MEASUREMENTS

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1. Which method uses a circular area for calculating the grain sizes?

a: Line intercept method Explanation

Explanation

b: ASTM method Explanation

Explanation

c: Jeffries Method Explanation

Explanation

d: None of the above Explanation

Explanation

2. Which method is also known as the planimetric method?

a: Jeffries Method Explanation

Explanation

b: Line intercept method Explanation

Explanation

c: ASTM standard method Explanation

Explanation

d: aNone of the above Explanation

Explanation

3. Which method is not suitable for calculations of significantly more prominent and finer grains?

a: Jeffries method Explanation

Explanation

b: Line intercept method Explanation

Explanation

c: ASTM standard method Explanation

Explanation

d: None of the above Explanation

Explanation

4. The ASTM grain size number (G) increases with:

a: Increasing grain diameter Explanation

Explanation

b: Decreasing grain diameter Explanation

Explanation

c: Increasing specimen thickness Explanation

Explanation

d: Decreasing magnification Explanation

Explanation

5. In the Jeffries Planimetric Method, the grain size is determined by:

a: Measuring the average intercept length of test lines across grains Explanation

Explanation

b: Counting the number of grains within a known area under the microscope Explanation

Explanation

c: Measuring the total grain boundary length per unit area Explanation

Explanation

d: Estimating the average grain diameter using X-ray diffraction Explanation

Explanation

6. Which of the following statements about ASTM grain size determination is true?

a: It can only be applied to ferrous alloys. Explanation

Explanation

b: It is a qualitative comparison method that may be supplemented by quantitative methods. Explanation

Explanation

c: The grain size number decreases with decreasing Explanation

Explanation

d: It cannot be used for polycrystalline materials. Explanation

Explanation

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