A Babitt is
A.A cutectic of iron and iron phosphide
B.A gadget for measuring volume
C.Antimony bearing lead or tin alloy
D.A measure of magnetic induction produced in a material
E.None of these
Category: Engineering Materials Mcqs
In Brinell hardness testing, while determining hardness of aluminium
A.Indenting ball of smaller diameter is used
B.Time of loading is reduced
C.Load on the indenter is reduced
Polystrene at room temperature is
A.Brittle
B.Malleable
C.Ductile
D.Soft
Which of the following is ‘acceptor’ impurity for semi-conductor?
A.Arsenic
B.Phosphorous
C.Boron
D.Antimony
E.All of the above
Steel cannot be hardened unless it is heated
A.Above the lowest critical point
B.Above the middle critical point
C.Above the highest critical point
D.Between the first and second critical point
E.Between the second and third critical point
Burger’s vector is
A.estimation of force9 of substit9utional atoms
B.a defect in crystall structure
C.a property of dislocations
D.None of the above
The process of reheating hardened steel to temperature below the lower critical temperature followed by any desired rate of cooling, is known as
A.Hardening
B.Spheroidizing
C.Tempering
D.Annealing
E.Normalizing
The resistivity of electrical conductors is most affected by
A.Temperature
B.Pressure
C.Composition
D.Temperature and pressure
E.Pressure or composition
Blisters in wrought iron cause
A.Brittleness at high temperatures
B.Brittleness at low temperatures
C.Loose textured metal
D.Voids created due to chemical reaction between carbon and iron oxide
E.None of the above
Heavy water is used in atomic power plants as
A.Fuel
B.Source of energy
C.Lubricant
D.Moderator
E.Viscous damping fluid
