Select one: a. the concentration of dislocations b. the size of the grains c. th

Question

Select one:

a. the concentration of dislocations

b. the size of the grains

c. the purity of the material

d. the arrangement of atoms

e. the type of bonding between the atoms and/or molecules

2.A metal which has a high Hall Petch slope is suitable for strengthening by grain refinement

Select one:

True

False

3.During elastic deformation of a material in compression:

Select one:

a. the bonds are stretched as the atoms are displaced from their equilibrium position

b. the atoms slide past one another into new equilibrium positions

c. the material is plastically deformed and the volume of the material decreases

d. the elastic modulus of the material decreases

e. the atoms move closer to each other in the direction of the applied stress

4.The Zybrolter company is searching for a suitable material to be used as body shell for its new aerial vehicle. The design engineer recommended a material with a density in the range of 2000 to 3000 kg/m3 and minimum yield strength of 170 MPa. Which of the following material is best suitable? (Use CES EDUPACK 2013 software at level 2).

Select one:

a. Aluminum alloy

b. Boron Carbide

c. Glass Ceramic

d. All the above

5.Select the material type which is most commonly associated with the following type of bond:

Ceramic / Polyemer or Ceramic / polymer / metal

for Hydrogen , Covalent, Metallic, Ionic, Van der walls

6.Necking commences in a uniaxial tensile test when (subscripts t and n denote

The following shows a crystal lattice with an edge dislocation. The arrows show the applied shear stress. Which of the following is Select one: the slip plane runs along C-D the dislocation will move towards B the dislocation will move towards D the dislocation will move towards A the distance between A and B is the Burgers vector

Explanation / Answer

0-a

1-

b. the size of the grains

2-true

3-

e. the atoms move closer to each other in the direction of the applied stress

4-

c. Glass Ceramic

5-Ceramic

6-

b. d?t/d?t=?n(1+?n)

7-

d. Because the fracture strain cannot be measured accurately during a test.

8-

a. Modulus varies with bond strength; the crystal has an inappropriate bond strength. The switch should be used at a higher temperature.

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