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
Category: Metallurgy Mcqs
Heating elements of electrical heaters are made of
A.Nichrome
B.Nicheloy
C.Invar
D.Tungsten
E.Phosphor bronze
Which of the following structure is least hard?
A.Martensite
B.Troosite
C.Pearlite
D.Sorbite
Machinability of metal depends on
A.Hardness
B.Hardness and tensile strength
C.Brittleness
D.Brittleness and toughness
E.None of the above
The percentage of carbon in cold rolled steel sheets is around
A.0.01%
B.0.10%
C.0.80%
D.1.10%
E.2.10%
Which of the following material does not have hexagonal close packed structure?
A.Magnesium
B.Alpha iron
C.Titanium
D.Zinc
E.Cadmium
The correct order of cooling media for decreasing cooling rate is
A.Air, water, oil, fused salt
B.Water, air, fused salt, oil
C.Oil, fused salt, air, water
D.Water, oil, fused alst, air
Highest specific gravity is of
A.Brass
B.Copper
C.Lead
D.Steel
E.Titanium
In grey cast iron, carbon is present in the form of
A.Cementite
B.Flakes
C.Powder
D.Spheroids
E.None of the above
An instrument which is used for measuring temperature variations by change in a metallic resistance is called a
A.Thermopile
B.Bolometer
C.Thennocouple
D.thermo-generator
E.Thermo-galvanometer
