Dislocations of opposite sign on the _____ slip plane will _____ each other.
a) same, attract
b) same, repel
c) different, attract
d) different, repel
Q.2.
The force of attraction or repulsion _____ with decreasing distance of separation.
a) increases
b) decreases
c) remains constant
d) first increases and then decreases
Q.3.
Attraction force between dislocations of opposite sign is _____
a) ∝ b
b) ∝ b1/2
c) ∝ b2
d) ∝ b3
Q.4.
Edge dislocations have _____ stress field therefore _____ interactions can occur between parallel edge dislocations.
a) symmetrical, a number of
b) symmetrical, less number of
c) unsymmetrical, a number of
d) unsymmetrical, less number of
Q.5.
Which statement is false?
a) Two edge dislocations of the same sign on parallel slip planes repel each other if ϴ<45°
b) Two edge dislocations of the same sign on parallel slip planes attract each other if ϴ<45°
c) Dislocations of opposite sign on the same slip plane attract each other
d) Dislocations of same sign on the same slip plane repel each other
Q.6.
The nature of the interaction of dislocations doesn’t depend on _____
a) relative position of dislocations
b) burgers vector
c) character of dislocations
d) source of dislocation
Q.7.
Annihilation due to the attraction between dislocations lying on parallel slip plane gives either ____ or _____
a) void, interstitialcy
b) pore, interstitialcy
c) interstitialcy, vacancy row
d) crack, vacancy row
Q.8.
What is the ratio of elastic strain energies, when two parallel edge dislocations of same sign on the same plane are separated farther apart to when they are very close together?
a) 1:1
b) 1:2
c) 2:3
d) 2:1
Q.9.
Screw dislocations always attract each other.
a) True
b) False
Q.10.
From annihilation of dislocations, total energy of system _____
a) increases
b) decreases
c) remains constant
d) first increases and then decreases
Q.11.
Screw dislocations of opposite sign having same Burgers vector ____ each other and two parallel edge dislocations of same sign on same plane ____ each other.
d) repel, repel
a) attract, attract
b) attract, repel
c) repel, attract
Q.12.
The nature of force between dislocations depends on the relative position of dislocations.
a) True
b) False
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