A hydrogen atom has
A.Two electrons
B.No neutrons
C.No protons
D.One each electron, neutron and proton
E.None of the above
Category: Engineering Materials Mcqs
Coal used in a cupola is
A.Charcoal
B.Pulverized coal
C.Graphite
D.Coke
E.Coking coal
Recrystallistion temperature is one
A.At which crystals again begin to appear
B.At which new spherical crystals first begin to form from the old deformed ones when a strained metal is heated
C.At which crystals start growing in size
D.At which polycrystalline changes occur
E.At which change of allotropic form takes place.
The materials which has the same elastic properties in all directions is called
A.Brittle material
B.Homogeneous material
C.Hard material
D.Isotropic material
E.Isentropic material
Residual magnetism is
A.Magnetism left in a sample after a decade
B.Magnetism left in a sample after one year
C.Flux density present in a material after magnetising force is removed
D.The magnetic force required to fully demagnetise a sample
E.None of the above
Brinell hardness number of mild steel should expected to be in the range be
A.20–50
B.10-110
C.110-150
D.150-300
E.300-450
As per ISS : designation T 70 W 18 4V 1 is
A.Low carbon steels
B.High speed steel
C.Silicon steel
D.Stainless steel
Just as strong is opposite to weak, similarly brittle is opposite to
A.Rigid
B.Elastic
C.Tough
D.Hard
E.Soft
The process of reheating the hardened steel to some temperature below the critical range, followed by any rate of cooling is known as
A.Tempering
B.Annealing
C.Austempering
D.Normalising
E.Spheroidising
Isotropic materials have
A.Same elastic properties in all directions
B.Different elastic properties in different directions
C.Variable thermal as well as electrical conductivity
D.Different compressive and tensile stresses at different locations in the same material
E.Cannot take shear as well as tensile stress
