Engineering Materials Set 12

Mechanical Engineering

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This set of Engineering Materials Multiple Choice Questions & Answers (MCQs) focuses on Engineering Materials Set 12

Q1 | If steel is slowly cooled in furnace, the structure obtained is
  • Pearlite
  • Martensite
  • Sorbite
  • Acicular
  • Troosite
Answer: Pearlite
Q2 | Machinability of a metal depends on
  • Tensile strength
  • Hardness
  • Toughness
  • (A) and (B) above
  • (B) and (C) above
Answer: (A) and (B) above
Q3 | Which is expected to be strongest in tension?
  • Aluminium wire
  • Mild steel wire
  • Piano wire
  • Stainless steel wire
  • Brass wire
Answer: Piano wire
Q4 | When metal is deformed by cold work, severe stresses known as residual stresses are undesirable and to remove them
  • The metal should be stressed in reverse direction
  • The metal should be painted
  • The metal should be reheated below recrystallization temperature
  • The metal should be reheated above recrystallization temperature
  • None of the above
Answer: The metal should be reheated below recrystallization temperature
Q5 | The ability of a tool to resist softening at high temperatures is known as
  • Super hardness
  • Red hardness
  • Extended hardness
  • Double hardness
  • None of the above
Answer: Red hardness
Q6 | Which of the following is a mesomorphous material?
  • Silver
  • Brass
  • Mica
  • Gold
  • Glass
Answer: Mica
Q7 | Electron with energy level of 2 MeV is considered as
  • Fast electron
  • There is no consideration as such
  • Dead slow electron
  • Slow electron
  • Super-fast electron
Answer: Fast electron
Q8 | Shot peening
  • Changes the crystalline structure of material
  • Refines the grain structure
  • Is done at recrystallization temperature
  • Improves fatigue life of small parts
  • Causes metal surface to be in tension and the layer beneath in compression
Answer: Improves fatigue life of small parts
Q9 | when atoms are hold together by the sharing of valence electrons
  • They form a covalent bond
  • The valence electrons are free to move away from the atom
  • Each shared electron leaves a hole
  • Each atom becomes free to move
  • None of the above
Answer: They form a covalent bond
Q10 | When piece of 0.2% carbon steel is heated above third critical point the steel is a solid solution of carbon in gamma iron and called
  • Ferrite
  • Austenite
  • Pearlite
  • Eutectoid
  • Cementite
Answer: Austenite
Q11 | The common household glass is
  • Lead glass
  • Borosilicate glass
  • Semi-conductors
  • Soda lime glass
  • High silica glass
Answer: Soda lime glass
Q12 | Silicon doped with phosphorous is an
  • intrinsic semi-conductor
  • extrinsic semi-conductor
  • p-type semi-conductor
  • n-type semi-conductor
  • None of the above
Answer: n-type semi-conductor
Q13 | When a normal atom loses an electron, the atom
  • Becomes a positive ion
  • Becomes a negative ion
  • Becomes a electrically neutral
  • Is then free to move about
  • None of the above
Answer: Becomes a positive ion
Q14 | Steel pipes are generally manufactured by
  • Forging process
  • Machining process
  • Extrusion process
  • Cold working process
  • Electroforming process
Answer: Extrusion process
Q15 | Which of the following class of materials are good conductors of heat and electricity?
  • Polymers
  • Dielectries
  • Ceramics
  • Semi-conductors
  • Metals
Answer: Metals
Q16 | The ability of a material to absorb energy in the plastic range is known as
  • Fatigue strength
  • Resilience
  • Toughness
  • Hardness
  • Creep
Answer: Toughness
Q17 | Sorbite' is obtained when
  • Quenching steel during transformation
  • Steel is annealed
  • A fully hardened steel is finally 'drawn' at about 677?C
  • None of the above
  • Copper nickel and chromium
Answer: Steel is annealed
Q18 | Selenium is an
  • intrinsic semi-conductor
  • extrinsic semi-conductor
  • p-type semi-conductor
  • n-type semi-conductor
  • None of the above
Answer: intrinsic semi-conductor
Q19 | In ferromagnetic materials
  • the atmic magnetic moments are anti-parallel and unequal
  • the atomic magnetic moments are parallel
  • the constituent is iron only
  • one of the constituent is iron
  • None of the above
Answer: the atomic magnetic moments are parallel
Q20 | Machining properties of steel are improved by adding
  • Chromium
  • Lead
  • Nickel
  • Silicon
  • Cobalt
Answer: Lead
Q21 | In compression, a prism of brittle material will break
  • Into large number of pieces
  • By forming a bulge
  • By shearing slong oblique plane
  • In a direction along the direction of load
  • None of the above
Answer: By shearing slong oblique plane
Q22 | Monel metal consists of
  • At which change of allotropic form takes place.
  • Aluminium copper and nickel
  • Zinc, copper and lead
  • Zinc nickel and copper
  • Nickel, lead and tin
Answer: Aluminium copper and nickel
Q23 | Cadmium sulphide cell is a
  • Photo conductive cell
  • Solar cell
  • Thermocouple
  • Photovoltaic cell
  • Photo emissive cell
Answer: Photo conductive cell
Q24 | Which process is different from the others
  • Drop forging
  • Cold extruding
  • Sand blasting
  • Short peening
  • Cold heading
Answer: Drop forging
Q25 | By alloying copper with manganese which of the following increases?
  • Specific gravity
  • Tensile strength
  • Melting point
  • Electrical conductivity
  • None of the above
Answer: Tensile strength
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