12 1) As the temperature of a metal increases, the vacancy concentration a) decreases b) increases c) remains the same
12 1) As the temperature of a metal increases, the vacancy concentration a) decreases b) increases c) remains the same
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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![7) The term allotropy is normally reserved for this behavior in pure elements /compounds,
while the term polymorphism is used for elements /compounds.
8) As the extent of undercooling decreases/ increases, the thermodynamic driving foree so
the formation of a solid phase from the liquid is decreased/ increased.
Q3(
Multiple Choice Answer 10 of 12
1) As the temperature of a metal increases, the vacancy concentration
a) decreases b) increases
c) remains the same
2) Which of the following statements is NOT true
a) The [100], [010] & [001] are equivalent in the cubic system
b) The [100] & [001] are equivalent in the cubic system
c) The [100], [010] & [001] are equivalent in the tetragonal system
d) The [100] & [010] are equivalent in the tetragonal system
3) The greater a materials Young's modulus the
the material.
a) stiffer
b) weaker
c) more ductile
d) tougher
4) The pearlite microstructure is formed
a) in hypereutectoid steels
c) in eutectoid steels d) all of the above
b) in hypoeutectoid steels
e) none of the above
5) Within the elastic limit
a) Strain is produced by bond breaking and reforming
b) Stress is proportional to strain
c) Complete recovery of strain is not possible
d) Strain is produced by bond stretching
e) b and d, are correct
f) a and b, are correct
6) Boron can diffuse in silicon can by either a vacancy or interstitial mechanism. Which
statement is probably true?
a) Dint<Dvac
b) Dint= Dvac
c)Din>Dyac
d) none
7)
Most metals are,
a) single crystals
Dpolycrystalline
c)mixtures of amorphous regions interspersed with single crystals
d) amorphous
73
Diffusion faster for materials with:
a. closed-packed structure.
c. higher melting T.
b. higher density.
d. lower melting T.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa4f941f0-d731-4131-bec1-f2a803406ad0%2F2af67294-54fb-4fac-8d24-7d0cfc215a97%2Fe3wvyn8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:7) The term allotropy is normally reserved for this behavior in pure elements /compounds,
while the term polymorphism is used for elements /compounds.
8) As the extent of undercooling decreases/ increases, the thermodynamic driving foree so
the formation of a solid phase from the liquid is decreased/ increased.
Q3(
Multiple Choice Answer 10 of 12
1) As the temperature of a metal increases, the vacancy concentration
a) decreases b) increases
c) remains the same
2) Which of the following statements is NOT true
a) The [100], [010] & [001] are equivalent in the cubic system
b) The [100] & [001] are equivalent in the cubic system
c) The [100], [010] & [001] are equivalent in the tetragonal system
d) The [100] & [010] are equivalent in the tetragonal system
3) The greater a materials Young's modulus the
the material.
a) stiffer
b) weaker
c) more ductile
d) tougher
4) The pearlite microstructure is formed
a) in hypereutectoid steels
c) in eutectoid steels d) all of the above
b) in hypoeutectoid steels
e) none of the above
5) Within the elastic limit
a) Strain is produced by bond breaking and reforming
b) Stress is proportional to strain
c) Complete recovery of strain is not possible
d) Strain is produced by bond stretching
e) b and d, are correct
f) a and b, are correct
6) Boron can diffuse in silicon can by either a vacancy or interstitial mechanism. Which
statement is probably true?
a) Dint<Dvac
b) Dint= Dvac
c)Din>Dyac
d) none
7)
Most metals are,
a) single crystals
Dpolycrystalline
c)mixtures of amorphous regions interspersed with single crystals
d) amorphous
73
Diffusion faster for materials with:
a. closed-packed structure.
c. higher melting T.
b. higher density.
d. lower melting T.
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