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This set of Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on Metallurgy Set 7
Q1 | Crucible for melting of metals are made of
- Cast iron
- Chromium
- Graphite
- Hard metal
- Tungsten
Q2 | In anti-ferromagnetic materials the spin moments associated with two sets of atoms are aligned
- Anti-parallel to each other
- Parallel to each other
- Random to each other
- Anti-parallel but of unequal magnitudes
- None of the above
Q3 | Ultimate tensile strength is least in case of mild steel and is of the order of
- 75 - 90 kg/mm2
- 60 - 75 kg/mm2
- 90 - 100 kg/mm2
- 50 - 60 kg/mm2
- 35 - 45 kg/mm2
Q4 | Which of the following is not true for cementite?
- It has low melting point
- It is found is steels
- It is brilliantly white
- It is hard
- It is brittle
Q5 | Which of the following furnace is used for steel only?
- Indirect arc furnace
- Cupola
- Low specific heat of quenching oil
- Open hearth furnace
- Air furnace
Q6 | The correct order of cooling media for decreasing cooling rate is
- Water, oil, fused alst, air
- Water, air, fused salt, oil
- Oil, fused salt, air, water
- Air, water, oil, fused salt
- Cast iron
Q7 | Quenching cracks during heat treatment can be minimised
- by avoiding sharp projections and sudden transitions from thick to thin sections
- articles should be free from stress before heat treatment
- heat to minimum stable temperature for hardening
- Any of the above
- Low specific heat of quenching oil
Q8 | In high frequency heating of steel, the heat is generated primarily due to
- Stray magnetic fields
- High voltage
- High resistance of contact surface
- High power
- Eddy currents
Q9 | During burning of grain boundaries
- regions enriched in carbon are formed in first state of burning
- non-oxidized cavities and blow holes are formed during second stage
- iron oxide inclusions are formed in third stage
- All of the above
- Low specific heat of quenching oil
Q10 | For nitriding, the nitrogen is provided by
- Ionised air
- Heated air
- Nitric acid
- Ammonia
- Nitrous oxide
Q11 | Which of the following is closest to the purest form of iron
- Mild steel
- Pig iron
- Nodular cast iron
- Grey cast iron
- Wrought iron
Q12 | Eddy currents
- Increase with square of frequency
- Increase with fourth power of frequency
- Increase with frequency
- Increase as inverse of frequency
- Increase with cube of frequency
Q13 | Which of the following is fluxing material for cupola?
- Limestone
- Fluorspar
- Soda Ash
- Any of the above
- None of the above
Q14 | In which of the following cases creep is an important consideration?
- Cast iron water pipes
- Cycle chains
- Gas turbine blades
- Steam engine flywheel
- All of the above
Q15 | Percentage of carbon in mild steel is
- 0.010 to 0.025
- 1.0 to 1.25
- 0.10 to 0.25
- 3.0 to 4.50
- 0.8 to 0.85
Q16 | The crystal structure of gamma iron is
- Cubic
- BCC
- FCC
- HCC
- Any of the above
Q17 | Constantan is an alloy containing
- Copper and nickel
- Lead and zinc
- Copper and zinc
- Zinc and nickel
- Lead and copper
Q18 | Which of the following constituent will increase the hardness of steel?
- Martensite
- Pearlite
- Austenite
- Cementite
- All of the above
Q19 | The depth of hardness in steel can be increased by the addition of
- Vanadium
- Chormium
- Tungsten
- Sulphur
- Nickel
Q20 | The coordination number of NaCl is
- 2
- 9
- 8
- 3
- 6
Q21 | Babbit metal is an alloy of
- Tin, copper and lead
- Tin, antimony and copper
- Tin, zinc and copper
- Tin, antimony and lead
- Lead, zinc and copper
Q22 | Hypoeutectoid steel has the structure of
- Cementite
- Pearlite
- Ferrite
- Ferrite & pearlite
- None of the above
Q23 | Which of the following hardening process is generally used for non-ferous materials?
- Nitriding
- Age hardening
- Pack carburizing
- Cyaniding
- Flame hardening
Q24 | Which metal has the highest melting point?
- Antimony
- Low specific heat of quenching oil
- Gold
- Chromium
- Stainless steel
Q25 | Angularity of the square base pyramid in Vickers hardness tester is
- 90?
- 11?
- 120?
- 150?
- 136?