Dislocations in materials are
A.Point defects
B.Line defects
C.Planer defects
D.Either point or planer defects
E.Either point, line or planer defects
Category: Engineering Materials Mcqs
The highest percentage of carbon that an iron carbon alloy can have is
A.2%
B.3%
C.4.40%
D.6.60%
E.12.12%
Hardness may be defined as resistance to
A.Local penetration
B.Machining
C.Wear
D.Scratching
E.Any of the above
Line imperfection in a crystal is called
A.Schottky defect
B.Frenkel defect
C.Edge dislocation
D.Any of the above
E.None of the above
Steel castings
A.Are weldable
B.Are not weldable
C.Have poor endurance properties
D.Can withstand impact
E.Cannot withstand impact
The process of adding impurity to a semi-conductor material is called
A.Mixing
B.Film deposition
C.Binding
D.Doping
E.Grouping
The theory of failure which gives fairly good results for the ductile materials is
A.Hooke’s law
B.Maximum shear stress theory
C.Maximum principal stress theory
D.Maximum strain energy theory
E.Maximum shear strain energy theory
The blast furnace uses the following as fuel:
A.Coal
B.Coke
C.Blast furnace gas
D.Producer gas
E.Cooking coal
The material which undergo recoverable deformation and exhibit rubber like elsticity are called
A.Pure elastic materials
B.Elastomers
C.Rubbers
D.Creep-elastic
E.None of the above
Age hardening is related with
A.Stainless steel
B.Gun metal
C.Duralumin
D.Cast iron
E.German silver
