The resistivity of electrical conductors is most affected by
A.Temperature
B.Pressure
C.Composition
D.Temperature and pressure
E.Pressure or composition
Category: Engineering Materials Mcqs
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
To chck the performance of a substance in deep drawing, the test usually conducted is
A.Tensile test
B.Fatigue test
C.Izod test
D.Charpy test
E.Cupping test
Cast irons are generally specified by
A.Carbon percentage
B.Iron percentage
C.Hardness
D.Process of manufacture
E.Tensile strength
The main constituent of glass is
A.SiO2
B.B2O3
C.Al2O3
D.CaCO3
The graphite rods in a nuclear pile
A.Convert fast moving neutrons into thermal neutrons
B.Furnish alpha particles
C.Furnish alpha beta particles
D.Furnish neutron to fission U235
E.Undergo combustion which triggers the fission reaction
Porous materials generally
A.Absorb most of the sound
B.Reflect entire sound
C.Transmit sound
In pack-carburising carbon is supplied
A.Through gas
B.In the form of graphite
C.In the form of charcoal
D.In the form of hydrocarbons
E.In the form of calcium carbide
Which of the following materials demonstrate viscoelastic behaviour?
A.Rubber
B.Glass
C.Plastics
D.Non-crystalline organic polymers
E.All of the above
