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This set of Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on Metallurgy Set 4

Q1 | During heat treatment, deformation and volume changes can be minimised by
  • slowly cooling in the martensitic range
  • using surface hardening when possible
  • using alloy steels least prone to such changes
  • Any of the above
  • Low specific heat of quenching oil
Q2 | Spherical metal powders are usually produced by
  • Milling
  • Electrolytic process
  • Oxidation
  • Automization
  • Reduction
Q3 | In Brinell hardness testing the timer for loading is
  • 15 seconds
  • 1 second
  • 5 seconds
  • 1 minute
  • 2 seconds
Q4 | The stainless steels owe their resistance to corrosion to the presence of
  • Chromium
  • Carbon
  • Sulphur
  • Manganese
  • Nickel
Q5 | The effect of austenitic grain size development during heat treatment is
  • lower hardenability
  • greater toughness
  • lower internal stress
  • All of the above
  • Low specific heat of quenching oil
Q6 | Warping may be avoided when quenching a long slender piece of work by
  • Holding the work piece between clamps and pouring water on it
  • Hoding the work piece vertically over the quenching bath and plunging it straight
  • Pulling the piece from both ends
  • Holding the piece horizontally in adequate supports
  • None of the above
Q7 | Which of the following is not a hardening process?
  • Nitriding
  • Carburising
  • Cyaniding
  • Sphcroidizing
  • Induction hardening
Q8 | The maximum percentage of carbon in austenite is
  • 2%
  • 2.70%
  • 1.70%
  • 0.07%
  • 0.70%
Q9 | Nichrome contains
  • Nickel, lead and zinc
  • Nickel and copper
  • Nickel and chromium
  • Nickel, copper and vanadium
  • Nickel, chromium and vanadium
Q10 | Free cutting steels usually have sulphur content of
  • 0.02 percent
  • 0.21 percent
  • 2 percent
  • 10 percent
  • 0.002 percent
Q11 | Fusible plug for boilers consists of
  • Zinc, bismuth and tin
  • Lead, tin and mercury
  • Copper, lead and tin
  • Bismuth, lead and tin
  • Zinc, copper and lead
Q12 | Stellite contains
  • Nickel, zinc and aluminium
  • Nickel, copper and zinc
  • Cobalt, chromium and tungsten
  • Copper, tin and lead
  • Cobalt, vanadium and nickel
Q13 | For producing cast iron pipes by centrifugal casting method the core used is
  • Wax core
  • Clay core
  • Metallic core
  • Sand core
  • No core is used
Q14 | Mild steel has the structure of
  • BCC
  • Cubic
  • FCC
  • HCC
  • Orthorhombic
Q15 | Which of the following furnace is used to convert liquid pig iron into steel?
  • Open hearth furnace
  • Cupola
  • Converter
  • Induction arc furnace
  • Low specific heat of quenching oil
Q16 | Lowest melting point may be expected for
  • Brass
  • Lead
  • Zirconium
  • Copper
  • Aluminium
Q17 | Which of the following is easiest to bend?
  • Grey pig iron
  • Wrought iron
  • Mottled pig iron
  • Cast iron
  • Steel
Q18 | Dilute nitric acid applied to a clean fracture of white cast iron will produce
  • Grey stain
  • Black stain
  • Pink stain
  • White stain
  • Brown stain
Q19 | Plasticisers are added to plastic compounds to
  • Improve resistance to acids
  • Provide a protective layer
  • Improve resistance to alkalies
  • Increase tensile strength
  • Improve softness and flexibility
Q20 | The process of providing zinc coating on steel pipes is known as
  • Cold working
  • Pickling
  • Galvanising
  • Blistering
  • Spheroidising
Q21 | Th phenomenon of emf development between two diferent metals placed in contact is known as
  • Kelvin effect
  • Thomson effect
  • Seeback effect
  • Peltier effect
  • Thermocouple effect
Q22 | Hardening by carburizing is limited to
  • 2 mm
  • 5 mm
  • 0.05 mm
  • Low specific heat of quenching oil
  • 0.1 mm
Q23 | Which of the following is by product from blast furnace?
  • Slag
  • Flue dust
  • Blast furnace gas
  • All of the above
  • None of the above
Q24 | Which of the following is not true in case of white cast iron
  • It is strong
  • It is brittle
  • It is malleable
  • It is whitish in colour
  • It is hard
Q25 | Which iron ore has least percentage of iron
  • Magnetite
  • Limonite
  • All have almost equal percentage of iron ore
  • Siderite
  • Hematite