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This set of Engineering Materials Multiple Choice Questions & Answers (MCQs) focuses on Engineering Materials Set 2
Q1 | Which of the following is a composite material?
- Y-alloy
- High speed steel
- Tungsten carbide
- Fibre reinforced plastic
- None of the above
Q2 | A material which undergoes no deformation till its yield point is reached and then it flows at a constant stress is known as
- Rigid plastic
- Elastic
- Rigid
- Plastic
- Elastic-plastic
Q3 | In carbon steel castings
- The percentage of carbon is less than 1.7%
- The percentage of carbon is between 1.7% to 2%
- The percentage for alloying elements is controlled
- (A) and (C) above
- (B) and (C) above
Q4 | Nickel is used in
- cutting tools
- automatic voltage regulators
- electrodes of thermionic valves
- pressure sensitive elements
- None of the above
Q5 | In order to improve machinability of steels, the treatment generally done is
- Cyniding
- Tempering
- Spheroidising
- Annealing
- Normalising
Q6 | Induction hardening is the process of
- Electrical hardening process
- Hardening surface for wear resistance
- Hardening the core
- Selective hardening
- Uniform hardening
Q7 | Troosite" is obtained when
- Quenching steel during transformation
- A fully hardened steel is finally drawn at about 677?C
- Steel is rapidly quenched in oil
- When alloy steels are rapidly quenched in water
- None of the above
Q8 | The semi-conductors have electrical conductivities of the following order (ohm-cm-1)
- 10?20
- 10?15
- 10?3
- None of the above
Q9 | Cast iron containing 6.6% carbon is
- Black in colour containing only pearlite
- Black in colour containing only ferrite
- Gray in colour containing pearite and ferrite only
- Whitish containing cementite only
- None of the above
Q10 | The main alloy for corrosion resistance in stainless steel is
- Manganese
- Carbon
- Vanadium
- Cobalt
- Chromium
Q11 | A steel having ferrite and pearite is
- Soft
- Hard
- Ductile
- (A) and (B) above
- (A) and (C) above
Q12 | Which variety of copper has the best mechanical strength?
- Annealed copper
- Hard drawn copper
- Cast copper
- Soft copper
- None of the above
Q13 | Brinell hardness number for nitrided steel is in the range
- 60 to 80
- 100 to 150
- 300 to 450
- 700 to 800
- 200 to 300
Q14 | Diamagnetic materials are
- Only slightly magnetised
- Strongly magnetised
- Magnetised with eddy currents only
- Magnetised in a direction opposite to that of the applied field
- None of the above
Q15 | Gamma iron has
- Body centred space lattice structure containing 6 atoms
- Body centred space lattice structure containing 10 atoms
- Face centred space lattice structure with 8 atoms
- Face centred space lattice structure with 14 atoms
- None of the above
Q16 | Silicon steel is widely used in
- Chemical industry
- For cutting tools
- Electrical industry
- For making leaf prings
- For nuts and bolts
Q17 | Moh's scale of hardness has the range
- 10--15
- 1--5
- 1--3
- 1--10
- 5--10
Q18 | The tendency for brittle fracture increases with
- Increasing temperature
- Decreasing strain rate
- Appreciable plastic deformation before fracture
- Appreciable plastic deformation during propagation of the crack
- None of the above
Q19 | Preheating of material to be welded is necessary in case of
- Non-ferrous materials
- Cast iron
- Stainless steel
- Carbon steel
- High speed steel
Q20 | Steel balls for ball bearings are generally made of
- Carbon chrome steel
- Stainless steel
- Cast steel
- Nodular cast iron
- Free carbon steel
Q21 | The process of reheating the hardened steel to some temperature below the critical range, followed by any rate of cooling is known as
- Spheroidising
- Normalising
- Tempering
- Annealing
- Austempering
Q22 | Delta iron occurs at temperature in the range of
- Room temperature to 600?C
- 600?C to critical temperature
- Between 800?C and 1200?C
- Between 1400?C and 1530?C
- None of the above
Q23 | Which process is used primarily to obtain surface finish
- Swaging
- Electroforming
- Shining
- Broaching
- Parkerizing
Q24 | In normalising steel is heated 40-50 C
- Above the upper transformation range
- Above the lower transformation range
- Below the lower transformation range
- Above room temperature
- Below the upper transformation range
Q25 | Which of the following metals has high tendency to get work hardened?
- Lead
- Silver
- Brass
- Aluminium
- Copper