Tensile strength of common varieties of cast iron is in the range
A.40 – 50 M Pa
B.50 – 80 M Pa
C.140 – 500 M Pa
D.500 – 650 M Pa
E.650 – 1000 M Pa
Category: Engineering Materials Mcqs
Selenium is
A.Intrinsic semi-conductor
B.Extrinsic semi-conductor
C.P-type semi-conductor
D.N-type semi-conductor
E.None of the above
Some engineering materials are made up of more than one phase, with different mechanical properties, such materials are known as
A.Discontinuous
B.Brittle
C.Plastic
D.Heterogeneous
E.None of the above
Which of the following aluminium alloy is commonly used for utensils?
A.Y-alloy
B.Duralumin
C.Magnalium
D.Babbit alloy
E.Hindalium
The defect responsible for the phenomenon of slip, by which most metals deform plastically, is known as
A.Fracture
B.Twinning
C.Dislocation
D.Strain hardening
E.None of the above
The operation of cutting out flat areas to some desired shape and which is generally the first step in a series of operations is known as
A.Coining
B.Curling
C.Blanking
D.Slitting
E.Lancing
An atom containing an odd number of electrons is said to be
A.Diamagnetic
B.Hypermagnetic
C.Paramgnetic
D.Ferromagnetic
E.Dielectric
Shot peening
A.Improves fatigue life of small parts
B.Causes metal surface to be in tension and the layer beneath in compression
C.Changes the crystalline structure of material
D.Refines the grain structure
E.Is done at recrystallization temperature
when atoms are hold together by the sharing of valence electrons
A.They form a covalent bond
B.The valence electrons are free to move away from the atom
C.Each shared electron leaves a hole
D.Each atom becomes free to move
E.None of the above
Plastic are
A.Good conductors of heat and bad conductors of electricity
B.Bad conductors of heat and good conductors of electricity
C.Good conductors of heat as well as electricity
D.Bad conductors of heat as well as electricity
E.Semi-conductors
