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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 9
Q1 | the and property of metals increase due to cold working
- hardness, electrical conductivity
- tensile strength, electrical conductivity
- electrical resistance, internal stresses
- corrosion resistance, ductility
Q2 | the and property of metals decrease due to cold working
- hardness, electrical conductivity
- tensile strength, electrical conductivity
- electrical resistance, internal stresses
- corrosion resistance, ductility
Q3 | the property of metals increases and property decreases due to cold working
- hardness, electrical conductivity
- ductility, electrical conductivity
- electrical resistance, internal stresses
- corrosion resistance, ductility
Q4 | the process by which the internal stresses are reduced in cold worked metal is called
- strain hardening
- hot working
- heat treatment
- cold treatment
Q5 | the heat treatment which is used to reduce the internal stresses after cold working is called as
- hardeninig
- annealing
- carburising
- quenching
Q6 | during recovery part of annealing treatment, which of the following properties are improved noticeably?
- hardness, electrical resistance, tensile strength
- electrical resistance, tensile strength, corrosion resistance
- tensile strength, corrosion resistance, ductility
- internal stresses, electrical resistance, corrosion resistance
Q7 | during which stage of annealing there is no major change in microstructure ?
- recrystalliza tion
- recovery
- grain growth
- none of the above
Q8 | the process of formation of new grains starts by the process of
- recovery
- nucleation
- grain growth
- none of the above
Q9 | nucleation starts at areas of
- low energy
- high energy
- randomly
- none of the above
Q10 | new grain formation take place in stage of annealing treatment
- recovery
- grain growth
- recrystalliza tion
- none of the above
Q11 | after the recrystalllization stage
- hardness and tensile strength reduces
- internal stresses reduces whereas corrosion resistance increases
- ductility increases
- all of the above
Q12 | during grain growth takes place
- new grains are formed
- no change in
- larger grains are formed
- all of the above
Q13 | strain hardening followed by annealing is known as
- cold working
- hot working
- strain hardening
- all of the above
Q14 | there are no residual internal stresses after hot working because
- metal is annealed before hot working
- there are no dislocations
- there is simultaneou s working and recrystalliza tion
- all of the above
Q15 | wire drawing is a type of
- cold working
- hot working
- cold working followed by hardening
- none of the above
Q16 | hot forging is a type of
- cold working
- hot working
- cold working followed by hardening
- none of the above
Q17 | in working of metals, the microstructure is distorted
- hot
- cold
- both
- none of the above
Q18 | it is possible to continuosly work on metal during working
- hot
- cold
- both
- none of the above
Q19 | cold working requires higherthan hot working
- temperature
- time
- energy for plastic deformation
- none of the above
Q20 | the possibility of oxidation is higher in case of working of metals
- hot
- cold
- both
- none of the above
Q21 | in case of hot working of metals, there is higher possibility of
- oxidation
- decarburizat ion
- both a and b
- none of the above
Q22 | the machinery used for hot working is than used for cold working
- cheaper
- expensive
- same
- depends on mertals used
Q23 | the resolved shear stress of a unit cell in nickel is N/mm2 if a tensile stress of 13.7 Mpa is applied. Take angle between the axial force and slip direction is 450 and angle between axial force and normal to slip is 540
- 2.3
- 5.7
- 5.2
- 6.1
Q24 | if resolved shear stress is maximum, it is given by
- σt
- 2σt
- 4σt
- 0.5σt
Q25 | at 450 the resolved shear stress is
- minimum
- maximum
- zero
- none of the above