True or False 1. Ceramics often fracture below their theoretical strength due to cracks which concentrate the...

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Mechanical Engineering

True or False
1. Ceramics often fracture below their theoretical strength dueto cracks which concentrate the applied stress.
2. The interstitial diffusion coefficient for a small atomdiffusing in a metal is usually larger than its diffusioncoefficient via a vacancy mechanism.
3. BCC, HCP, FCC are all Bravais lattices belonging to the cubiccrystal system.
4. The larger the number of slip systems available to a metal,the easier it is to deform.
5. HCP has an \"abab\" stacking sequence, FCC has an \"abcabc\"stacking sequence.
6. Dislocations move most easily in a crystal along the highestdensity planes along the lowest density direction.
7. There are 14 Bravais lattices, each of which belongs to oneof the 7 crystal systems.
8. Elastic deformation results from the breaking and reformingof bonds.
9. Thermal expansion in crystalline materials is the result ofan asymmetry in the repulsive and attractive force curves betweenpairs of atoms.
10.Graphite and diamond are two different phases of carbon.

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4.0 Ratings (482 Votes)

1 True as cracks concentration decreases ceramic strength 2 False converse is true interstitial diffusion coefficient for a small atom diffusing in a metal is usually smaller than its diffusion coefficient via a See Answer

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