Properties Of Materials

Question 1

1. Which of the following material properties are of most concern if corrosion resistance is essential?
A. Processing properties
B. Mechanical properties
C. Physical properties
D. Chemical properties

Answer 1

D. Chemical properties

Question 2

2. Which of the following is true relative to the comparison of the properties of aluminum-based alloys and iron-based alloys?
   A. Iron has a lower melting point than aluminum
   B. Iron can exist in several different crystalline structures, and its properties can be controlled by heat treating
   C. Iron can be alloyed to increase its strength, whereas aluminum is strongest in its pure state
   D. Iron is preferred in load carrying designs, but it should not be used for any deformation type of manufacturing process

Answer 2

B. Iron can exist in several different crystalline structures, and its properties can be controlled by heat treatment

Question 3

3. Tensile tests are conducted on specimens from a newly developed alloy in order to determine the ultimate tensile strength of the material.  Such tests are referred to as:
A. Indirect tests
B. Physical properties test
C. Destructive tests
D. Acoustic emission tests

Answer 3

C. Destructive tests

Question 4

8. The modulus of elasticity (Young’s modulus) is related to the materials relative:
A. Tensile strength
B. Compressive strength
C. Resistance to stress
D. Stiffness and yield strength

Answer 4

D. Stiffness and yield strength

Question 5

9. Which of the following materials is typically considered when the application only requires high compressive strength?
A. Low carbon steel
B. High carbon steel
C. Cast iron
D. Magnesium

Answer 5

C. Cast iron

Question 6

10. A fatigue failure can often be prevented using NDT to:
    A. Verify the cyclic loading on a component part
    B. Detect surface discontinuities that could be stress risers
    C. Measure the endurance limit of a part undergoing cyclic stresses
    D. Determine percent elongation of a material before it is placed in service

Answer 6

B. Detect surface discontinuities that could be stress risers

Question 7

11. Which of the following tests uses a pendulum to break a specimen that is notched an supported on both ends, with the result of measuring energy absorption?
A. Creep test
B. Charpy test
C. Fatigue test
D. Transverse rupture test

Answer 7

B. Charpy test

Question 8

13. Direct hardness test provide a measure of a materials ability to resist?
A. Bending
B. Surface and near-surface penetration
C. Tensile stresses
D. Elongation

Answer 8

B. Surface and near-surface penetration

Question 9

14. True/False

Factor of safety = Material yield strength/Maximum working stress

Answer 9

True

Question 10

12. True/False: A SN-Curve (sometimes written S-N Curve) is a plot of the magnitude of an alternating stress versus the number of cycles to failure for a given material. Typically both the stress and number of cycles are displayed on logarithmic scale

Answer 10

True