AE 316 – Spring 2024
Name: _____________________
Section: _______
Homework #3
Circle the answer for objective questions. Use additional paper if needed for problems II
to IV
I – Answer the following questions on the attached answer sheet:
1- The diffusion coefficient depends on:
a. The temperature
b. The element diffusing and the host element
c. The concentration gradient
d. None of the above
e. a, b and c
2- For a given host metal, interstitial diffusion generally occurs ___________ than
(as) vacancy diffusion:
a. Less rapidly
b. More rapidly
c. About the same
3- Steady state diffusion occurs when
a. There is no more diffusion occurring
b. There is a constant diffusion flux
c. There is a constant diffusion coefficient
d. None of the above
4- Fick’s first law of diffusion states that:
a. The diffusion flux is proportional to the rate of mass transfer
b. The diffusion flux is proportional to the concentration gradient
c. The concentration gradient profile is linear
5- The distribution of load to different components of a structure depends on their
relative
a. Stiffness
b. Strength
c. Fracture Toughness
d. Hardness
6- Under uniaxial tension, the stress state on any given plane at an angle q from
the plane normal to the direction of the load is:
a. Also uniaxial
b. Zero
c. Complicated and has several components
7- Elastic behavior of linear elastic isotropic material can be described completely
by ________ s
a. One constant, E
b. Two constants, E and v
c. Three constants, E, G and v
