Maximum hardness that can be achieved in plain carbon steel is of the order of
A.50 Rockwell ‘C’
B.66 – 67 Rockwell ‘C’
C.100 – 150 Rockwell ‘C’
D.80-85 Rockwell ‘C’
E.There is no such limit for hardness
A.50 Rockwell ‘C’
B.66 – 67 Rockwell ‘C’
C.100 – 150 Rockwell ‘C’
D.80-85 Rockwell ‘C’
E.There is no such limit for hardness
A.Nichrome
B.Nicheloy
C.Invar
D.Tungsten
E.Phosphor bronze
A.Martensite
B.Troosite
C.Pearlite
D.Sorbite
A.Hardness
B.Hardness and tensile strength
C.Brittleness
D.Brittleness and toughness
E.None of the above
A.0.01%
B.0.10%
C.0.80%
D.1.10%
E.2.10%
A.Magnesium
B.Alpha iron
C.Titanium
D.Zinc
E.Cadmium
A.Air, water, oil, fused salt
B.Water, air, fused salt, oil
C.Oil, fused salt, air, water
D.Water, oil, fused alst, air
A.Brass
B.Copper
C.Lead
D.Steel
E.Titanium
A.Cementite
B.Flakes
C.Powder
D.Spheroids
E.None of the above
A.Thermopile
B.Bolometer
C.Thennocouple
D.thermo-generator
E.Thermo-galvanometer