On This Page
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