Engineering Materials Set 14

Mechanical Engineering

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This set of Engineering Materials Multiple Choice Questions & Answers (MCQs) focuses on Engineering Materials Set 14

Q1 | High purity copper is obtained by
  • casting
  • rolling
  • induction heating
  • electric refining
  • None of the above
Answer: electric refining
Q2 | A solution of NaOH conducts electricity bcause NaOH is
  • A dielectric
  • A non-electrolyte
  • A strong electrolyte
  • A week electrolyte
  • None of the above
Answer: A strong electrolyte
Q3 | The process by which a steel ingot is converted into a sheet is known as
  • Rolling process
  • Routing process
  • Re-rolling process
  • Machining process
  • Forging process
Answer: Rolling process
Q4 | Eutectic is
  • a phase transformation in which all the liquid phase transforms on cooling to two solid phases simultaneously
  • A phase transformation which occurs above the glass transition temperature
  • a solid solution of one component in another
  • None of the above
  • None of the above
Answer: a phase transformation in which all the liquid phase transforms on cooling to two solid phases simultaneously
Q5 | One of the objects of annealing is
  • To refine grain structure
  • To soften the metal
  • to improve machinability
  • All above
  • To refine internal stresses
Answer: All above
Q6 | Silicon steel used for electrical purposes has silicon percentage of
  • 3.40%
  • 2.50%
  • 13.40%
  • 1.50%
  • 0.50%
Answer: 3.40%
Q7 | Which of the following method can be used for thermoplastic materials?
  • Blow moulding
  • Casting
  • Calendering
  • Compression moulding
  • None of the above
Answer: Calendering
Q8 | Which of the following polymer is crystalline?
  • Semi-conductors
  • Polyvinylidene chloride
  • Polyvinyl chloride
  • Polyethylene
  • Polymethyl metacrylate
Answer: Polyethylene
Q9 | Which of the following alloy does not contain tin?
  • Gun metal
  • Phosphor bronze
  • Fusible plug material
  • White metal
  • All of the above
Answer: White metal
Q10 | The behavious of visco-elastic material is
  • Time dependent
  • Independent of time
  • Plastic
  • Elastic
  • Ductile
Answer: Elastic
Q11 | When the temperature of a semi-conductor is reduced to absolute zero
  • all electrons become free
  • electrons move at higher velocities
  • all valence electrons remain in the valence bond
  • all valence electrons shift to forbidden gap
  • None of the above
Answer: all valence electrons remain in the valence bond
Q12 | Which of the following pipe will corrode easily?
  • Stainless steel pipe
  • GI pipe
  • ERW pipe
  • Copper pipe
  • Lead pipe
Answer: ERW pipe
Q13 | Identify the correct relation
  • Mass number - Atomic number = Number of neutrons
  • Mass number - Atomic number = Number of protons
  • Number of neutrons - Number of protons = Mass number
  • Number of electrons outside the nucleus - Number of proton = Mass number
  • None of the above
Answer: Mass number - Atomic number = Number of neutrons
Q14 | In which of the following case creep is an important consideration?
  • Piston of an air compressor
  • Exhaust valve of a diesel engine
  • Blades of a steam turbine
  • Flywheel of a petrol engine
  • Shaft of a centrifugal compressor
Answer: Blades of a steam turbine
Q15 | Malleal lity of a material is defined as
  • Ability to withstand compressive stresses
  • Ability to withstand deformation under shear
  • Ability to undergo large permanent deformation in compression
  • The property by which a material can be cold worked
  • None of the above
Answer: Ability to undergo large permanent deformation in compression
Q16 | The percentage of carbon in low carbon steel is
  • 0.15
  • 1.3
  • 0.7
  • 1
  • 0.5
Answer: 0.15
Q17 | Which process is used for joining parts or materials?
  • Extruding
  • Tumbling
  • Swaging
  • Parkerizing
  • Sintering
Answer: Sintering
Q18 | In case of eutectoid steels which one of the following structures has the maximum hardness?
  • Troosite
  • Sorbite
  • Pearlite
  • Acicular
  • Martensite
Answer: Martensite
Q19 | Ductility of material may be defined as
  • Ability to undergo temporary deformation in tension
  • Capacity to withstand combined tensile and shear forces
  • Ability to undergo large permanent deformations in tension
  • Capacity to withstand reversal of stresses
  • Capacity to resist deformation under pressure
Answer: Ability to undergo large permanent deformations in tension
Q20 | The Miller indices of the diagonal plane of a cube are
  • 100
  • 0
  • 10
  • 110
  • 111
Answer: 110
Q21 | The primary purpose of annealing is to
  • Restrict the hardness of steel
  • Soften the steel for machining after cold working
  • Reduce carbon percentage
  • Change the crystalline structure
  • None of the above
Answer: Soften the steel for machining after cold working
Q22 | Isotropic materials have
  • Same elastic properties in all directions
  • Cannot take shear as well as tensile stress
  • Variable thermal as well as electrical conductivity
  • Different elastic properties in different directions
  • Different compressive and tensile stresses at different locations in the same material
Answer: Same elastic properties in all directions
Q23 | Most of the energy expended in deforming a metal by cold working is
  • Utilised in overcoming deformation stresses
  • Utilised in deforming the metal
  • Converted into heat
  • Consumed in developing internal stresses
  • None of the above
Answer: Converted into heat
Q24 | The properties of cast iron are regulated by
  • Heat treatment
  • Percentage of carbon present
  • Heating temperature
  • The composition of raw material
  • Control of amount, type, size and distribution of various carbon formations
Answer: Control of amount, type, size and distribution of various carbon formations
Q25 | Polysterene is
  • An alkyl halide
  • A hydrocarbon
  • An ester
  • An alcohol
  • Semi-conductors
Answer: A hydrocarbon
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