Top 250+ Solved Metallurgy MCQ Questions Answer
Q. During heat treatment quenching cracks occur due to
a. irregular martensitic transformation within the article
b. oxidising atmosphere within the fumace
c. heating at higher temperatures for longer durations
d. All of the above
e. Low specific heat of quenching oil
Q. If during spark test, a sample gives dull red sparks, it could be
a. Mild steel
b. Medium carbon steel
c. Cast iron
d. Non-ferrous material
e. Wrought iron
Q. Welding process used in fabrication of car bodies is
a. Brazing
b. Soldering
c. Thermit welding
d. Arc welding
e. Resistance welding
Q. The process for steel making being used at Rourkela steel plant is
a. Open hearth process
b. L-D process
c. Electric process
d. Bessemmer process
e. Duplex process
Q. The hardness obtained by hardening process does not depend upon
a. Carbon content
b. Work size
c. Atmospheric temperature
d. Quenching rate
e. None of the above
Q. Austenitic stainless steels contain chromium and nickel in amounts required to assure that even at room temperatures, the steels retain their crystalline structures, which are
a. Face centred cubic
b. Diamond cubic
c. Hexagonal closed-packed
d. Partly amorphous
e. None of the above
Q. The process used for making steel is
a. Bessemer converter
b. Open hearth
c. Electric arc
d. High frequency heating
e. Any of the above
Q. 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
e. Low specific heat of quenching oil
Q. Carbon percentage in steel for carburizing is usually
a. 0.15 percent
b. 0.6 percent
c. 1 percent
d. 0.8 percent
e. 1.5 percent
Q. The operation that usually follwos hardening is
a. Tempering
b. Normalising
c. Annealing
d. Carburising
e. Cyaniding
Q. Which of the following gives a fracture crystalline in appearance?
a. Steel
b. Wrought iron
c. Cast iron
d. All of the above
e. None of the above
Q. On Moh's scale, materials with hardness number less than 4 are
a. Topaz, Corundum, Diamond
b. Hardened and tempered
c. Felspar, corundum, Diamond
d. Fluorite, Felsper, Talc
e. Talc, gypsum, calcite
Q. Highest melting point is for
a. Cast iron
b. Wrought iron
c. Low carbon steel
d. Mild steel
e. High carbon steel
Q. Petrol engine carburetors are manufactured by
a. Die casting
b. Lost wax casting
c. Sand casting
d. Centrifugal casting
e. Shell casting