Mechanical Metallurgy Mock Test 2

10%

Question 1 of 10

1. Slip begins when the shearing stress on the slip plane in the slip direction reaches a threshold value called the critical resolved shear stress.

True

False

Question 1 of 10

Question 2 of 10

2. The atomic packing efficiency of FCC and Simple cubic is __________

68% and 52%

74% and 52%

74% and 68%

68% and 74%

Question 2 of 10

Question 3 of 10

3. Octahedral stresses are the stresses acting on the faces of a three-dimensional octahedron which has the geometric property that the faces of the planes make equal angles with each of the three principal directions of stresses.

False

True

Question 3 of 10

Question 4 of 10

4. Cross slip can occur in both the edge dislocation as well as in screw dislocation.

True

False

Question 4 of 10

Question 5 of 10

5. Integers indicate crystallographic directions in brackets: [u v w]. Reciprocals are not used in determining directions.

False

True

Question 5 of 10

Question 6 of 10

6. Which of the following phenomena is not associated with dislocation?

Lomer-Cottrell barrier

Pourbix curve

Frank-reed source

Stacking fault

Question 6 of 10

Question 7 of 10

7. Tin cry phenomena is associated with ______________

slip

oxidation

annealing

twin

Question 7 of 10

Question 8 of 10

8. Find the shear strain in the material if the burger vector of dislocation is 0.1nm, average distance moved by dislocation is 1 micron, and dislocation density is 10⁸ m^-2?

10⁸

10^-8

10^-10

Question 8 of 10

Question 9 of 10

9. The dislocation of low mobility that is produced by a dislocation reaction is called a ______ dislocation.

glissile

screw

edge

sessile

Question 9 of 10

Question 10 of 10

10. Which of the following phenomena is responsible for the formation of sessile dislocation?

Frank read source

Lomer-Cottrell barriers

Dislocation jog and kink

Age hardening

Question 10 of 10