The nucleation of solid grains from a liquid melt is no impurities______________

Question

The nucleation of solid grains from a liquid melt is no impurities______________Crystalline ceramics exhibits poor toughness due to dislocations A BCC crystal Contains (220) planes with a spacing d = 0.2866 nm. If X-rays wavelength lambda = 0.1790 nm fall on these planes, the diffraction line will appear at the 78.9 degree 60.7 degree 124.6 degree 80.9 degree No diffraction lines will appear Data: n lambda = 2d_hklsin theta, d_hkl = a[h^2 + k^2 + l^2]^-1/2 The phase transformation in which the liquid plus a solid phase give rise to a new phase is known as: Pearlite Eutectoid Congruent Peritecti In a Eutectic alloy when the amount of delta T for the L Rightarrow alpha + beta transformation is degrees you obtain: Few coarse alpha + beta lamellae Large moderate alpha + beta lamellae, Very large fine lamellae What is the equilibrium number of vacancies per cubic meter in pure copper at 1000 2.2 times 10^21 2.2 times 10^22 2.2 times 10^23 2.2 times 10^24 2.2 times 10^25 Given Nv- N_exp-Qv/kT, Qv = 0.90 eV, k = 8.62 times 10^-5 eV/K, Cu density, rho = 8.4 g/cm^3, Cu = 63.5g/mol, N - rho AvNo/At.mass. AvNo = 6.022 times 10^23 ats/mol. A 0.2cm diameter wire must carry a 20-A current. If the maximum power dissipation the wire is 4W/m. what is the minimum allowable conductivity of the wire in Ohm-m? 3.18 times 10^5 3.18 times 10^6 3.18 times 10^7 3.18 times 10^8 Given R = rho l/A, and Power = i^2R. rho = resistivity in Ohm-m, i = current in Amperes, l =

Explanation / Answer

1. (e)

2a. (a)

2b. (a)

3. (C)

4. (C)

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.