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Mechanical Behaviour Written Test
Quiz 1
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Q.1
Which one of the following, is not a method of introducing imperfections in metals?
a) Heating
b) Processing
c) Alloying
d) Crystallization
Q.2
Which one is a point defect?
a) Dislocation
b) Vacancy
c) Grain boundary
d) Void
Q.3
Which point defect is known as equilibrium defect?
a) Void
b) Dislocation
c) Interstitial
d) Vacancy
Q.4
Identify the defect for the below diagram.
a) Frankel
b) Schottky
c) Interstitialcy
d) Vacancy
Q.5
Identify the defect for the below diagram.
a) Interstitial
b) Substitutional
c) Interstitialcy
d) Schottky
Q.6
Substitutional atoms are generally close in size (approximately 15%) to the parent metal atoms.
a) True
b) False
Q.7
Which one is not an example of interstitial impurity?
a) Carbon in iron
b) Zinc in brass
c) Hydrogen in Palladium
d) Nitrogen in iron
Q.8
If the atom is transferred to an interstitial position instead of the surface, then this defect is known as _____
a) Interstitial
b) Frankel
c) Schottky
d) Vacancy
Q.9
In interstitial defect, the atoms surrounding the defect are in the state of tension.
a) True
b) False
Q.10
For copper, the ratio between interstitial formation enthalpy and the energy required to create a vacancy is _____________
a) 3:1
b) 2:1
c) 1:1
d) 1:2
Q.11
Match the following: i) Oxidation of copper a) Frankel ii) Neutron irradiation causes b) vacancy iii) GaAs (anti site defect) c) interstitialcy iv) Steel (C in Fe) d) interstitial
a) i-b, ii-d, iii-a, iv-c
b) i-b, ii-c, iii-a, iv-d
c) i-c, ii-b, iii-a, iv-d
d) i-d, ii-c, iii-a, iv-b
Q.12
Which alloy system shows complete solubility?
a) Cd-Mg
b) Cu-Zn
c) Fe-Ni
d) Cu-Sn
0 h : 0 m : 1 s
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