Virtual Labs

QUANTITATIVE TECHNIQUES FOR GRAIN SIZE MEASUREMENTS

1. Fill in the blanks
Grain size in materials science and metallurgy refers to the size of the …………. crystalline grains within a material's microstructure.

a: Poly Explanation

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b: Single Explanation

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c: Largest Explanation

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d: None of the above Explanation

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2. Which method uses lines as the fundamental calculating tool for calculating grain size?

a: Jeffries method Explanation

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b: Line intercept method Explanation

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c: ASTM grain size calculation method Explanation

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d: None of the above Explanation

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3. Full form of ASTM

a: American Science for Testing of Materials Explanation

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b: American Standard for Testing and Materials Explanation

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c: American Society for Testing and Materials Explanation

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d: American Society for Testing of Metals Explanation

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4. According to the ASTM E112 standard, the relationship between the number of grains per unit area at 100× magnification (n) and the ASTM grain size number (N) is given by:

a: n = 2^{(N + 1)} Explanation

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b: n = 2^{(N - 1)} Explanation

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c: n = 2^{(N - 1)/2} Explanation

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d: n = 2^N Explanation

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5. In the linear intercept method, the average grain size is determined by measuring:

a: The total number of grains per unit area Explanation

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b: The total length of grain boundaries per unit area Explanation

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c: The average length of line segments intercepted by grain boundaries Explanation

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d: The number of grains in a known volume Explanation

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6. In the Jeffries Method, what is the usual convention for counting grains intercepted by the test circle?

a: Count all intercepted grains as 1 Explanation

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b: Ignore the intercepted grains Explanation

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c: Count the intercepted grains as half (1/2) Explanation

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d: Count them twice for better accuracy Explanation

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