Which of the following is the hardest?
A.Talc
B.Fluorite
C.Quartz
D.topaz
E.Corundum
A.Talc
B.Fluorite
C.Quartz
D.topaz
E.Corundum
A.Softening
B.Cold working
C.Shot blasting
D.Annealing
E.Temperature
A.White stain
B.Grey stain
C.Black stain
D.Brown stain
E.Pink stain
A.Tin, antimony and copper
B.Tin, antimony and lead
C.Tin, copper and lead
D.Tin, zinc and copper
E.Lead, zinc and copper
A.Copper, lead and tin
B.Copper, zinc and tin
C.Copper, zinc and tin
D.Zinc, nickel and tin
E.Nickel, aluminium and copper
A.Pit furnace
B.Crucible furnace
C.Cupola
D.Oil fired tilting furnace
E.Gas fired tilting furnace
A.Aluminium
B.Brass
C.Copper
D.Lead
E.Zirconium
A.Fatigue
B.Proof deformation
C.Gradual deformation
D.Creep
E.Endurance failure
A.Alpha iron
B.Beta iron
C.Gamma iron
D.Delta iron
E.All of the above
A.1
B.2
C.5 — 10
D.20 — 30
E.50 — 80