Which of the following is the major constituent of corundum?
A.Carbon
B.Diamond
C.SiO2
D.MgCl2
E.Al2O3
Category: Engineering Materials Mcqs
Which one is different from the remaining
A.Cynding
B.Nitriding
C.Flame hardening
D.Electroplating
E.Pack carburizing
The elastic limit of cast iron is
A.Low
B.High
C.Same as that of mild steel
D.Low compression strength
E.Close to ultimate breaking strength
When the temperature of a semi-conductor is reduced to absolute zero
A.all electrons become free
B.electrons move at higher velocities
C.all valence electrons remain in the valence bond
D.all valence electrons shift to forbidden gap
In reinforced conccrete, steel rods are used to increase
A.Tensile strength
B.Compressive strength
C.Shear strength
D.None of the above
The process of heating iron base alloys to approzimately 40?C above the critical temperature range followed by cooling to below that range in still air at ordinary temperature is known as
A.Normalizing
B.Annealing
C.Tempering
D.Spheroidizing
E.Hardening
Notches in a section produce
A.Compressive stress
B.Shear stresses
C.Biaxial tensile stresses
D.Tri-axial tensile stresses
E.None of the above
Which of the following colour of light has the least wavelength?
A.Red
B.Violet
C.Green
D.Orange
E.Blue
Electro-forming is particularly vauable for
A.Good conductors of electricity
B.Decorative items
C.Thin walled parts requiring a high order of accuracy and internal surface finish
D.Non-ferrous components
E.Parts which cannot be machined
Vanadium is added to steel as an alloying element to
A.Increase temperture resistance
B.Increase shock resistance
C.Modify yield and tensile strength properties
D.Increases resistance to corrosion
E.To soften the material
