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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