Quiz #4- Requires Respondus LockDown Browser_ 202309 - Structure & Prop. of Materials - 43380
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Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380
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Quiz #4- Requires Respondus LockDown Browser
Due
Oct 6 at 11:03a.m.
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15
Questions
15
Available
Oct 6 at 10:44a.m. - Oct 6 at 11:03a.m. 19 minutes
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Allowed Attempts
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Requires Respondus LockDown Browser
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Attempt History
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Time
Score
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Attempt 1
9 minutes
5 out of 15
Score for this attempt: 5
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Submitted Oct 6 at 10:54a.m.
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Quiz #4
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0 / 1 pts
Question 1
If we take the natural log of the equation for diffusion coefficient, we get the
equation of a straight line which has a slope of:
-Q/R orrect Answer
orrect Answer
10/20/23, 9:06 PM
Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380
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2/7
-1/T You Answered
You Answered
-Q/T 1/T 1 / 1 pts
Question 2
Which of the following is NOT TRUE for steady-state diffusion?
The concentration gradient is constant There is no net transfer of mass Correct!
Correct!
The diffusion flux is constant The concentration profile is linear 0 / 1 pts
Question 3
Lesser distortion in the crystal lattice is created under self-interstitial defect.
True You Answered
You Answered
False orrect Answer
orrect Answer
1 / 1 pts
Question 4
10/20/23, 9:06 PM
Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380
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3/7
The solution of the non-steady state equation applied in two situations is
greatly simplified when:
The resultant concentration is the same in the two situations. Correct!
Correct!
the absolute temperature is the same for the two situations. the applied surface concentration is same in the two situations. the distance from the surface is same for the two situations. 0 / 1 pts
Question 5
The relationship between temperature and activation energy for diffusion is:
Linear You Answered
You Answered
Constant orrect Answer
orrect Answer
Exponential 0 / 1 pts
Question 6
Inter-diffusion is defined as: exchange of host atom and vacancy position diffusion of atoms of one solid material into another material orrect Answer
orrect Answer
diffusion of atoms between tetrahedral and octahedral interstitial sites You Answered
You Answered
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10/20/23, 9:06 PM
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0 / 1 pts
Question 7
Diffusion of atoms generally requires less activation energy in BCC than
FCC. True orrect Answer
orrect Answer
False You Answered
You Answered
0 / 1 pts
Question 8
The atoms of two elements having radii similar to each other tend to have
lower solubility in each other.
True You Answered
You Answered
False orrect Answer
orrect Answer
0 / 1 pts
Question 9
A polycrystalline material is best defined as a material that has:
many grains of different sizes randomly aligned orrect Answer
orrect Answer
many grains of the same size randomly aligned You Answered
You Answered
10/20/23, 9:06 PM
Quiz #4- Requires Respondus LockDown Browser: 202309 - Structure & Prop. of Materials - 43380
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5/7
many grains of the same size uniformly aligned many grains of different sizes uniformly aligned 1 / 1 pts
Question 10
Replacement of an impurity atom in the crystal lattice is called a . . . . . . .
volume imperfections Vacancy defect Stacking defect Substitution impurity Correct!
Correct!
0 / 1 pts
Question 11
An element would diffuse at the same rate in different host metals if the
temperature and concentration gradient are kept the same. True You Answered
You Answered
False orrect Answer
orrect Answer
0 / 1 pts
Question 12
10/20/23, 9:06 PM
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Materials with many close-packed directions have generally more slip
systems than those with fewer close-packed directions.
True orrect Answer
orrect Answer
False You Answered
You Answered
1 / 1 pts
Question 13
Carbon atoms are found in the spaces between iron atoms in steel. This is
defect is known as:
interstitial Correct!
Correct!
Vacancy Substitutional Dislocation 0 / 1 pts
Question 14
Which one of the following is not a zero-dimensional defect?
Screw dislocation orrect Answer
orrect Answer
Substitution imperfection You Answered
You Answered
Vacancy defect
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1 / 1 pts
Question 15
The boundaries that separate two small grains in polycrystalline materials
are called . . . . . .
Grain boundaries Correct!
Correct!
Screw boundaries Substitutional boundaries Quiz Score: 5
out of 15
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