The stainless steels owe their resistance to corrosion to the presence of
A.Chromium
B.Carbon
C.Manganese
D.Sulphur
E.Nickel
Category: Metallurgy Mcqs
Which thermocouple can measure the highest temperature?
A.Copper-constantan
B.Iron constantan
C.Chromel-alumel
D.Platinum-rhodium
E.Tungsten- molybdenum
Which of the following element has hexagonal close packed structure?
A.Aluminium
B.Molybdenum
C.Cadmium
D.Chromium
E.Lead
Under identical values of cold and hot junction temperatures which thermocouple given the highest output
A.Iron constantan
B.Nickel nimo
C.Chromel-constantan
D.Platinum-platinum-rhodium
E.All give equal output
The minimum carbon percentage required in steel so that it may respond to hardening by heat treatment is
A.0.02 percent
B.0.08 percent
C.0.2 percent
D.0.8 percent
Pure iron has the structure of
A.Pearlite
B.Austenite
C.Ferrite
D.Pearlite and austenite
E.Pearlite, austenite and ferrite
Free cutting steels usually have sulphur content of
A.0.002 percent
B.0.02 percent
C.0.21 percent
D.2 percent
E.10 percent
Formation of thick layer of scale on the surface of steel articles can be minimised by
A.heating in furnaces with reducing neutral or protective atmosphere
B.heating in boxes with used carburising agent or cast iron chips
C.heating in molten salt bath
D.Any of the above
Invar is an alloy of
A.Iron and nickel
B.Iron and copper
C.Iron and zinc
D.Iron and chromium
E.Iron and vanadium
Annealing treatment is normally used for
A.Forgings
B.Cold worked sheets
C.Wires
D.Castings
E.All of the above
