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This set of Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on Metallurgy Set 3
Q1 | Which of the following metal has face centred cubic structure?
- Tin
- Gold
- Magnesium
- Zinc
- Cadmium
Q2 | Which colour of flame represents the highest temperature?
- Dark red
- Pink
- White
- Light yellow
- Bright red
Q3 | Which of the following metal does not have face centred cubic structure?
- Nickel
- Tin
- Lead
- Copper
- Silver
Q4 | The rollers of a cycle chain are subjected to
- Shear stress
- Tensile stress
- Creep stress
- Fatigue stress
- Compressive stress
Q5 | The maximum temperature inside a blast furnace gas is of the order of
- 2600?C
- 1000?C
- 1600?C
- 50?C
- 3600?C
Q6 | If an article develops insufficient hardening after quenching it could be due to any of the following EXCEPT
- Internal stresses in the article before heating
- Low specific heat of quenching oil
- Cooling rate too slow
- Holding insufficient at the hardening temperature
- Hardening temperature too low
Q7 | Which of the following is the hardest?
- Fluorite
- topaz
- Quartz
- Corundum
- Talc
Q8 | The allotropic form of iron not having body centred cubic lattice is
- Alpha iron
- Beta iron
- Gamma iron
- Delta iron
- All of the above
Q9 | Dilute nitric acid applied to a clean fracture of wrought iron gives
- Grey stain
- Greenish stain
- White stain
- Blue stain
- Black stain
Q10 | Railway rails are made of
- Mild steel
- Low carbon steel
- Medium carbon steel
- Dead muld steel
- High carbon steel
Q11 | High ductility wires are made on
- Wrought iron
- Medium carbon steel
- Cast iron
- Dead mild steel
- High carbon steel
Q12 | The highest percentage of chrommium that can be added to steel is usually
- 18 percent
- 25 percent
- 15 percent
- 50 percent
- 12 percent
Q13 | Eutectoid steel has a structure of
- Martensite
- Bainite
- Sorbite
- Nickel
- A combination of all above
Q14 | The flux used in blast furnace while melting iron ore is
- Bauxite
- Carbon
- Oxygen
- Sodium chloride
- Lime stone
Q15 | Galvanising layer usually provides protection in the range of water
- 7 to 14
- Complete protection is provided
- 1 to 7
- 1 to 14
- 6 to 11
Q16 | Ferrite is
- Low specific heat of quenching oil
- Present in abundance in high carbon steel
- Soft and ductile
- Hardenable under rapid cooling
- Amorphous and brittle
Q17 | If a sample of steel shows unsymmetrical deformation of a piece in quenching, the probable cause could be
- Impure quenching oil
- Low specific heat of quenching oil
- Excessive proportion of alloying elements
- Non-uniform heating or cooling
- Low temperature during heating
Q18 | Attack of steel is increased by
- Salt solution below a paint coat
- Invisible moisture film present prior to painting
- Graphite in the priming coat
- Loose rust and partially removed mill scale
- All of the above
Q19 | Which allotropic form of iron is magnetic at room temperature?
- Alpha iron
- Beta iron
- Gamma iron
- Delta iron
- All of the above
Q20 | Persence of lead in brass improves
- Malleability
- Hardenability
- Ductility
- Fatigue resistance
- Machining properties
Q21 | Which of the following is a noble metal?
- Aluminium
- Chromium
- Stainless steel
- Nickel
- Platinum
Q22 | Which of the following form of iron is produced as a result of annealing of white cast iron?
- Wrought iron
- Spheroidal iron
- Nodular iron
- Malleable iron
- Grey iron
Q23 | Which colour of heat represents the highest temperature?
- Low specific heat of quenching oil
- White
- Salmon
- Dry cherry
- Blood red
Q24 | Nickel is
- Ferromagnetic
- Ferroelectric
- Dielectric
- Paramagnetic
- None of the above
Q25 | The tensile strength of nodular iron may be of the order of
- 500 kg/cm2
- 100 kg/cm2
- 1000 kg/cm2
- 2000 kg/cm2
- 4000 kg/cm2