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This set of Engineering Materials Multiple Choice Questions & Answers (MCQs) focuses on Engineering Materials Set 15
Q1 | Steel cannot be hardened unless it is heated
- Between the first and second critical point
- Above the middle critical point
- Above the lowest critical point
- Above the highest critical point
- Between the second and third critical point
Q2 | Case hardening
- Is done to get a soft ductile interior with a very hard surface
- Is done to induce hardness in the core of materials
- Is followed by tempering
- Is allowed by carburizing
- Is preceded by tempering
Q3 | High ratio of surface to mass tend to
- Produce smaller depths of hardening
- Produce non-uniformity in hardness on surface
- Produce only chilled surfaces
- Produce surface defects
- Produce greater depth of hardening
Q4 | The machine used for determining tensile strength of steel is
- Hydraulic jack
- Hydraulic press
- Mechanical press
- Universal testing machine
- None of the above
Q5 | Toughness of a material means
- Stress relieving
- Softening
- Machinability
- Strength
- Fatigue resistance
Q6 | Blast furnace gas is
- Used as fuel in a blast furnace
- A by-product of blast furnace
- A flue gas discharged to atmosphere
- Used as a cooking gas
- Highly poisonous
Q7 | Materials in order of reducing electrical conductivity are
- Aluminium, Silver, Gold, Copper
- Gold, Silver, Copper, Aluminium
- Copper, Silver, Gold,Aluminium
- Silver, Copper, Gold, Aluminium
- None of the above
Q8 | The critical points for steels
- Change the chemical composition of steel
- Cause change in physical properties
- Indicate the minimum temperature below which structural changes in steel are not possible
- May change in number on heating or cooling
- Occur at same temperature for all steels
Q9 | Grey iron
- Has low ductility
- Breaks with appreciable distortion
- Has brittleness
- Low compression strength
- None of the above
Q10 | Crystal structure of a material is generally examined by
- Microscope
- Naked eye
- Spectroscope techniques
- X-rays and electron diffraction
- Optical microscope
Q11 | Which is the heaviest?
- Positron
- Proton
- Electron
- Neutron
- Atom
Q12 | If a solid cube is subjected to equal tensile stresses on all its faces the volumetric strain is n times the linear strain, where
- n = 1
- n = 2
- n = 6
- n = 3
- n = 9
Q13 | The process of pulling a rod through series of decreasing diameters is known as
- Wire drawing
- Metal spinning
- Trimming
- Staking
- Stretch forming
Q14 | Line imperfection in a crystal is called
- Schottky defect
- Frenkel defect
- Edge dislocation
- Any of the above
- None of the above
Q15 | The process of polymerisation is associated with
- Thermo-plastic
- High speed steel
- Cast iron
- Non-ferrous material
- Non-metallic materials
Q16 | Selenium is
- Intrinsic semi-conductor
- Extrinsic semi-conductor
- P-type semi-conductor
- N-type semi-conductor
- None of the above
Q17 | Which of the following is not a semi-conductor?
- Silicon
- Tetraethyl lead
- Gallium Arsenide
- Germanium
- All of the above
Q18 | The main constituent of dynamite is
- Sulphur
- Oxygen
- Nitroglycerine
- Potassium chlorate
- Sodium nitrate
Q19 | To chck the performance of a substance in deep drawing, the test usually conducted is
- Charpy test
- Fatigue test
- Cupping test
- Tensile test
- Izod test
Q20 | Which of the following is the characteristic of ceramic materials?
- Malleability and ductility
- Hardness and brittleness
- Elasticity and plasticity
- Porosity and flexibility
- None of the above
Q21 | Sheradising process is used for
- Cold working on metals
- Heat treatment of steels
- Machining metals
- Heat treatment of high speed steels
- Surface coating
Q22 | Nichrome are alloys of
- Nickel, chromium and aluminium
- Nickel, chromium
- Nickel, chromium and silver
- Nickel, chromium and iron
- Nickel, chromium and copper
Q23 | Identify the incorrect statement
- The greatest error in Briuell hardness measurements occur in measuring the diameter of specimen
- Harder the material, greater the elastic recovery after deformation
- Owing to elastic recovery, the radius of curvature of the indentation will be larger than that of the spherical indentor
- None of the above
- Resilience
Q24 | The modulus of elasticity E, the bulk modulus of elasticity K and the Poisson's ratio are related by the relation
- K = (1 +
- E = K (1 -
- E = 3K (1 - 2
- E = K (2 +
- E = 2K (1 +
Q25 | Phenol and formaldehyde are polymerised to a resultant product known as
- PVC
- Bakelite
- Polyester
- None of the above
- Semi-conductors