Engineering Materials Set 13

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This set of Engineering Materials Multiple Choice Questions & Answers (MCQs) focuses on Engineering Materials Set 13

Q1 | The limitations of electroforming are
  • Cost is high
  • Production rate is generally very low
  • Recesses can be easily formed
  • (A) and (B) above
  • (A) and (C) above
Q2 | Which of the following is the lightest?
  • Neutron
  • Molecule
  • Atom
  • Electron
  • Proton
Q3 | Cold shortness is
  • Too much shrinkage of materials at low temperatures
  • Uneven shrinkage of materials at low temperatures
  • Brittleness of material at low temperature
  • The region where Hooke's law does not hold good
  • None of the above
Q4 | The process of shaping thin metals by pressing it against form while it is rotating is known as
  • Pressing
  • Extruding
  • Bending
  • Metal spinning
  • Trimming
Q5 | Stress concentration occurs when
  • A body is subjected to excessive stress
  • A body is subjected to reversing stress
  • A body is subjected to non-uniform stress distribution
  • A body is subjected to fluctuating stress
  • A body is subjected to unidirectional stress
Q6 | Brinell hardness number of mild steel should expected to be in the range be
  • 150-300
  • 110-150
  • 20--50
  • 300-450
  • 10-110
Q7 | DIN standards are used in
  • India
  • Britain
  • France
  • USSR
  • Germany
Q8 | The process of reheating hardened steel to temperature below the lower critical temperature followed by any desired rate of cooling, is known as
  • Hardening
  • Spheroidizing
  • Annealing
  • Tempering
  • Normalizing
Q9 | Gamma iron exists at temperatures in the range
  • Room temperature and lower critical temperature
  • Between 1400?C and 1600?C
  • Above 1600?C
  • Between 500?C and 850?C
  • Between 900?C and 1400?C
Q10 | Hardness of martensite is about
  • RC 67
  • RC 65
  • RC 48
  • RC 89
  • RC 57
Q11 | Nitriding is a process for
  • Annealing
  • Spheroidizing
  • Case hardening
  • Normalizing
  • None of the above
Q12 | Polyethylene is produced by
  • Condensation polymerization
  • Addition polymerization
  • Colpolymerization of ethylene monomers
  • None of the above
  • Semi-conductors
Q13 | Which of the following rays are neither deflected by electric field nor by magnetic field?
  • ?-rays
  • ?-rays
  • ?-rays
  • X-rays
  • None of the above
Q14 | In drop forging the forging is done by
  • Dropping the workpiece at high velocity
  • Dropping the hammer at high velocity
  • Dropping the die with hammer at high velocity
  • Dropping a weight on hammer to produce requisite impact
  • None of the above
Q15 | The process of austempering results in the formation of
  • Carburized structure
  • Martensitic structure
  • Nitride structure
  • Bainite structure
  • Superhand structure
Q16 | Which of the following materials can be used for temperatures upto 500?C?
  • Empire cloth
  • Paper oiled
  • Mica
  • Polythene
  • None of the above
Q17 | The resistivity of electrical conductors is most affected by
  • Temperature
  • Pressure or composition
  • Composition
  • Pressure
  • Temperature and pressure
Q18 | The process of adding impurity to a semi-conductor material is called
  • Grouping
  • Mixing
  • Doping
  • Binding
  • Film deposition
Q19 | Which of the following material can be used at temperatures above 100?C?
  • Polythene
  • Teflon
  • Rubber
  • Paraffin wax
  • None of the above
Q20 | Which of the following method cannot be used for thermoplastic materials?
  • Extrusion
  • Blow moulding
  • Injection moulding
  • All of the above
  • None of the above
Q21 | Identify the correct statement
  • A metal which is brittle in tension at room temperature can become ductile in the presence of notches
  • A metal which is brittle in tension t room presence of embrittlement agents such as hydrogen
  • A metal which is ductile in tension at room temperature can become brittle in the presence of notches
  • A metal which is ductile in tension at room temperature can become brittle under gradual rate of loading
  • None of the above
Q22 | The process of heating iron base alloys to approzimately 40?C above the critical temperature range followed by cooling to below that range in still air at ordinary temperature is known as
  • Normalizing
  • Tempering
  • Hardening
  • Spheroidizing
  • Annealing
Q23 | Bainiti is a fine maxture of
  • ferrite and cementite
  • cementitie and peoitite
  • pearlite and ferrite
  • austenti and ferrite
  • None of the above
Q24 | In inverse rate curve
  • The ordainate is temperature
  • The abscissa is time
  • The abscissa is temperature
  • The ordinate is time
  • The abscissa is carbon percentage
Q25 | In Brinell hardness tests if a soft ball is used for indentation
  • The indentation will not eb circular
  • It will not be possible to correctly measure the depth of indentation
  • The surface of indentation will be rough
  • The ball may deform
  • None of the above