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This set of Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on Metallurgy Set 8

Q1 | Modulus of elasticity for steel is approximately
  • 52 x 106 kg/cm2
  • 1.2 x 106 kg/cm2
  • 12 x 106 kg/cm2
  • 2 x 106 kg/cm2
  • 78 x 106 kg/cm2
Q2 | Maximum hardness that can be achieved in plain carbon steel is of the order of
  • There is no such limit for hardness
  • 100 - 150 Rockwell 'C'
  • 66 - 67 Rockwell 'C'
  • 50 Rockwell 'C'
  • 80-85 Rockwell 'C'
Q3 | The principle on which a disappearing filamment type pyrometer works is known as
  • Wien's law
  • Peltier effect
  • Kirchhoff's law
  • Seeback effect
  • Fourier's law
Q4 | The percentage of sulphur in steel can be reduced by adding
  • Copper
  • Chormium
  • Magnesium
  • Manganese
  • Zinc
Q5 | Cold worked components are generally subjected to
  • Shot peenling
  • Normalising
  • Hardening
  • Sherodising
  • Annealing
Q6 | If the structure of a sample consists of pearlite, cementite and free carbon, the sample may be
  • Cast iron
  • Alloy steel
  • Dead mild steel
  • Eutectoid steel
  • None of the above
Q7 | During heat treatment quenching cracks occur due to
  • irregular martensitic transformation within the article
  • oxidising atmosphere within the fumace
  • heating at higher temperatures for longer durations
  • All of the above
  • Low specific heat of quenching oil
Q8 | If during spark test, a sample gives dull red sparks, it could be
  • Mild steel
  • Medium carbon steel
  • Cast iron
  • Non-ferrous material
  • Wrought iron
Q9 | Welding process used in fabrication of car bodies is
  • Brazing
  • Soldering
  • Thermit welding
  • Arc welding
  • Resistance welding
Q10 | Approximate Brinell Hardness number for talc is
  • 20 -- 30
  • 1
  • 5 -- 10
  • 2
  • 50 -- 80
Q11 | The process for steel making being used at Rourkela steel plant is
  • Open hearth process
  • L-D process
  • Electric process
  • Bessemmer process
  • Duplex process
Q12 | The hardness obtained by hardening process does not depend upon
  • Carbon content
  • Work size
  • Atmospheric temperature
  • Quenching rate
  • None of the above
Q13 | 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
  • Face centred cubic
  • Diamond cubic
  • Hexagonal closed-packed
  • Partly amorphous
  • None of the above
Q14 | The process used for making steel is
  • Bessemer converter
  • Open hearth
  • Electric arc
  • High frequency heating
  • Any of the above
Q15 | Formation of thick layer of scale on the surface of steel articles can be minimised by
  • heating in furnaces with reducing neutral or protective atmosphere
  • heating in boxes with used carburising agent or cast iron chips
  • heating in molten salt bath
  • Any of the above
  • Low specific heat of quenching oil
Q16 | Carbon percentage in steel for carburizing is usually
  • 0.15 percent
  • 0.6 percent
  • 1 percent
  • 0.8 percent
  • 1.5 percent
Q17 | The operation that usually follwos hardening is
  • Tempering
  • Normalising
  • Annealing
  • Carburising
  • Cyaniding
Q18 | Which of the following gives a fracture crystalline in appearance?
  • Steel
  • Wrought iron
  • Cast iron
  • All of the above
  • None of the above
Q19 | On Moh's scale, materials with hardness number less than 4 are
  • Topaz, Corundum, Diamond
  • Hardened and tempered
  • Felspar, corundum, Diamond
  • Fluorite, Felsper, Talc
  • Talc, gypsum, calcite
Q20 | Highest melting point is for
  • Cast iron
  • Wrought iron
  • Low carbon steel
  • Mild steel
  • High carbon steel
Q21 | Petrol engine carburetors are manufactured by
  • Die casting
  • Lost wax casting
  • Sand casting
  • Centrifugal casting
  • Shell casting
Q22 | Which metal has the lowest melting point?
  • Aluminium
  • Copper
  • Iron
  • Magnesium
  • Silver
Q23 | Bronze is an alloy
  • Copper, lead and tin
  • Copper, zinc and tin
  • Copper, zinc and tin
  • Zinc, nickel and tin
  • Nickel, aluminium and copper
Q24 | Which of the following material does not have hexagonal close packed structure?
  • Alpha iron
  • Zinc
  • Magnesium
  • Cadmium
  • Titanium
Q25 | The minimum carbon percentage required in steel so that it may respond to hardening by heat treatment is
  • 0.02 percent
  • 0.08 percent
  • 0.2 percent
  • 0.8 percent
  • Low specific heat of quenching oil