EVALUATION EXAM 6 (Engineering Mechanics and Strength of Materials) Flashcards
Modulus of rigidity is also known as
A. Young’s Modulus
B. Modulus of Elasticity
C. Bulk Modulus
D. Shear Modulus
Shear Modulus
The three-moment equation may be used to analyze __________.
A. an axially end-loaded beam
B. a continuous beam
C. a beam loaded at the third points
D. A step tapered column
A continuous beam
Which of the following alloying elements increase resistance of steel to atmospheric corrosion?
A. copper
B. nickel
C. chromium
D. copper, nickel and chromium
copper, nickel and chromium
Ratio of longitudinal stress to hoop stress in a thin cylinder is _________.
A. equal
B. half
C. one-fourth
D. four times
half
Given a free falling body with air resistance neglected, if the final position travelled is four times its initial position. By what factor does the velocity of the body increase?
A. twice
B. four times
C. same
D. half
Twice
Which of the following does cold working a metal cause?
A. elongation of grains in the flow direction, an increase in dislocation density, and an overall increase in energy of the metal.
B. elongation of grains in the flow direction, a decrease in dislocation density, and an overall decrease in energy of the metal.
C. elongation of grains in the flow direction, a decrease in dislocation density, and an overall increase in energy of the metal.
D. shortening of grains in the flow direction, a decrease in dislocation density, and an overall decrease in energy of the metal.
elongation of grains in the flow direction, an increase in dislocation density, and an overall increase in energy of the metal.
In general, what are the effects of cold working of a metal?
A. increased strength and ductility
B. increased strength and decreased ductility
C. decreased strength and ductility
D. decreased strength and increased ductility
increased strength and decreased ductility
Which of the following is true about the modulus of elasticity E?
A. It is the same as rupture modulus.
B. It is the slope of the stress-strain diagram in the linearly elastic region.
C. It is the ratio of stress to volumetric strain.
D. Its value depends only on the temperature of the material.
It is the slope of the stress-strain diagram in the linearly elastic region.
Which crystal structure possesses the highest number of closed-packed planes and closed-packed directions?
A. simple cubic
B. body-centered cubic
C. face-centered cubic
D. close-packed hexagonal
Face-centered cubic
How many atoms per unit cell for a face-centered cubic structure?
A. one
B. two
C. three
D. four
Four
6 atoms for close-packed hexagonal
8 atoms for simple cubic
How many atoms per unit cell for a body-centered cubic
2
Which of the following materials is NOT a viscoelastic material?
A. plastic
B. metal
C. rubber
D. glass
Metal
Where do stress concentrations occur?
I. near the points of applications of concentrated loads
II. along the entire length of high distributed loads
III. at discontinuities
A. I and II
B. I and III
C. II and III
D. I, II and III
- near the points of applications of concentrated loads
- at discontinuities
Under which type of loading does fatigue occur?
A. static load
B. plane load
C. high load
D. repeated load
Repeated load
The modulus of rigidity of a steel member is
A. defined as the length divided by the moment of inertia
B. defined as the unit shear stress divided by the unit shear deformation
C. Equal to the modulus of elasticity divided by one plus Poisson’s ratio
D. a function of the length and depth
defined as the unit shear stress divided by the unit shear deformation
What is a coal that has been previously burned in an oxygen-poor environment?
A. Tureye
B. Diamond
C. Ore
D. Coke
Coke
What is the atomic packing factor of a simple cubic crystal?
A. 0.35
B. 0.52
C. 0.74
D. 0.68
0.52
0.74 for FCC
0.68 for BCC
The physical property of a metal that can be DRAWN into the thin wire is called
A. Ductility
B. Malleability
C. Lustre
D. Elasticity
Ductility
The physical property of a metal that can be ROLLED into the thin wire is called
A. Ductility
B. Malleability
C. Lustre
D. Elasticity
Malleability
