Engineering Materials Set 8

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

Q1 | The process in which steel is heated 20? to 40?C below the lower critical temperature, held there for a prolonged period and then allowed to cool slowly in the furnace is known as
  • Annealing
  • Tempering
  • Normalising
  • Austempering
  • Spheroidising
Q2 | The fine grained steel
  • Are brittle
  • Are lighter
  • Are doctile
  • Have more tendency to distort
  • None of the above
Q3 | An atom containing an odd number of electrons is said to be
  • Hypermagnetic
  • Paramgnetic
  • Ferromagnetic
  • Diamagnetic
  • Dielectric
Q4 | For heavy loads in aircraft bearings the material used with lead to reduce the risk of scizure is
  • Silver
  • Copper
  • Iron
  • Tin
  • Zinc
Q5 | The raw material for mini steel plants is
  • Iron ore
  • Pig iron
  • Grey iron
  • CI and steel scrap
  • None of the above
Q6 | Which type of electron pair exists in a semi-conductor?
  • Ionic
  • Non-ionic
  • Homopolr
  • Hetropolar
  • None of the above
Q7 | A body which is permanently deformed is said to have undergone
  • Elastic deformation
  • Limit of elastic deformation
  • Uniform deformation
  • Non-uniform deformation
  • None of the above
Q8 | In Charpy impact test, the specimen is held as a
  • cantilever
  • simply supported beam
  • fixed beam
  • hinged beam
  • None of the above
Q9 | Materials which lack permanent magnetic dipoles are called
  • diamagnetic
  • ferromagnetic
  • semi-magnetic
  • None of the above
  • None of the above
Q10 | The consitituent which has a powerful softening effect on cast iron and its presence in cast iron reduces the ability of the iron to retain carbon in chemical combination, is
  • Silicon
  • Carbon
  • Sulphur
  • Aluminium
  • Chromium
Q11 | Which of the following materials demonstrate viscoelastic behaviour?
  • Rubber
  • Glass
  • Plastics
  • Non-crystalline organic polymers
  • All of the above
Q12 | Carbon steel is
  • An alloy of carbon and iron with varying quantities of phosphorous
  • An alloy of carbon and iron obtained by oxidising excessive carbon from cast iron
  • An alloy of carbon and iron obtained by oxidising excessive carbon steel
  • An alloy of carbon generally obtained by adding graphite to low carbon steels
  • None of the above
Q13 | A hydrogen atom has
  • Two electrons
  • No neutrons
  • No protons
  • One each electron, neutron and proton
  • None of the above
Q14 | Which one is different from the others in press work
  • Tube forming
  • Embossing
  • Bulging
  • Cupping
  • Notching
Q15 | Which of the following properties has lower value for copper as compared to aluminium?
  • Specific gravity
  • Melting point
  • Electrical resistivity
  • All of the above
  • None of the above
Q16 | A bearing alloy should have
  • High resistance to corrosion
  • Capacity to withstand shocks and vibrations
  • All above
  • Low coefficient of friction
  • High compressive strength
Q17 | When a loop composed of two dissimilar metals could be made to carry a continuous current simply by maintaining the two junctions at different temperatures, the above effect is known as
  • Thomson effect
  • Thompson effect
  • Peltier effect
  • Seeback effect
  • None of the above
Q18 | All of the following are point defects EXCEPT
  • vacancies
  • dislocations
  • interstitials
  • isolated impurities
  • None of the above
Q19 | The limiting load beyond which the material no longer behaves elastically is known is
  • Breaking load
  • Load bearing capacity
  • Limiting load
  • Plastic limit
  • Elastic limit
Q20 | When elastic limit is reached
  • Tensile strain decreases in proportion to stress
  • Tensile strain increases in proportion to stress
  • Tensile strain increases more quickly
  • Tensile strain decreases more quickly
  • None of the above
Q21 | In general, high cohesive forces are related to
  • Large values of elastic constants
  • Low melting point
  • Large coefficients of thermal expansion
  • Small value of elastic constants
  • None of the above
Q22 | Hardness may be defined as resistance to
  • Local penetration
  • Machining
  • Wear
  • Scratching
  • Any of the above
Q23 | The theory of failure which gives fairly good results for the ductile materials is
  • Hooke's law
  • Maximum shear stress theory
  • Maximum strain energy theory
  • Maximum principal stress theory
  • Maximum shear strain energy theory
Q24 | Which of the following factor has the least effect on the electrical conductivity of wires made of copper alloy?
  • Temperature
  • Alloying element
  • Vitrified clay
  • Method of forming the wire
  • Intensity of any incident light
Q25 | Thermoplastic and thermoset polymers differ in
  • Glass transition temperature
  • Thermal behaviour
  • Mechanical behaviour
  • All of the above
  • Semi-conductors