Manufacturing Engineering MCQ

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• NC contouring is an example of
  ক

  continuous path positioning

  খ

  point-to-point positioning

  গ

  absolute positioning

  ঘ

  incremental positioning
• The tail stock set over method of taper turning is preferred for
  ক

  internal tapers

  খ

  small tapers

  গ

  long slender tapers

  ঘ

  steep tapers
• For turning internal tapers, the suitable method is
  ক

  by a form tool

  খ

  by setting over the tail stock

  গ

  by a taper turning attachment

  ঘ

  none of the mentioned
• The tool material, for faster machining, should have
  ক

  wear resistance

  খ

  red hardness

  গ

  toughness

  ঘ

  all of the mentioned
• In machining metals, surface roughness is due to
  ক

  feed marks or ridges left by the cutting tool

  খ

  fragment of built up edge on the machined surface

  গ

  cutting tool vibrations

  ঘ

  all of the mentioned
• The machining of titanium is difficult due to
  ক

  high thermal conductivity of titanium

  খ

  chemical reaction between tool and work

  গ

  low tool-chip contact area

  ঘ

  none of the mentioned
• For machining a cast iron workpiece by a high speed steel tool, the average cutting speed is
  ক

  10 m/min

  খ

  15 m/min

  গ

  22 m/min

  ঘ

  30 m/min
• For machining a mild steel workpiece by a high speed steel tool, the average cutting speed is
  ক

  5 m/min

  খ

  10 m/ min

  গ

  15 m/min

  ঘ

  30 m/min
• For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of
  ক

  500

  খ

  1000

  গ

  1750

  ঘ

  2750
• The specific cutting energy used for establishing the machinability of the metal depends upon its
  ক

  coefficient of friction

  খ

  micro-structure

  গ

  work hardening characteristics

  ঘ

  all of the mentioned
• Tool life is generally better when
  ক

  grain size of the metal is large

  খ

  grain size of the metal is small

  গ

  hard constituents are present in the micro structure of the tool material

  ঘ

  none of the mentioned
• The tool life is said to be over if
  ক

  poor surface finish is obtained

  খ

  there is sudden increase in cutting forces and power consumption

  গ

  overheating and fuming due to heat of friction starts

  ঘ

  all of the mentioned
• Tool life is measured by the
  ক

  number of pieces machined between tool sharpenings

  খ

  time the tool is in contact with the job

  গ

  volume of material removed between tool sharpenings

  ঘ

  all of the mentioned
• Flank wear occurs mainly on the
  ক

  nose part, front relief face and side relief face of the cutting tool

  খ

  face of the cutting tool at a short distance from the cutting edge only

  গ

  cutting edge only

  ঘ

  front face only
• The tool may fail due to
  ক

  cracking at the cutting edge due to thermal stresses

  খ

  chipping of the cutting edge

  গ

  plastic deformation of the cutting edge

  ঘ

  all of the mentioned
• Crater wear leads to
  ক

  increase in cutting temperature

  খ

  weakening of tool

  গ

  friction and cutting forces

  ঘ

  all of the mentioned
• Crater wear is predominant in
  ক

  carbon steels

  খ

  tungsten carbide tools

  গ

  high speed steel tools

  ঘ

  ceramic tools
• Flank wear depends upon the
  ক

  hardness of the work and tool material at the operating temperature

  খ

  amount and distribution of hard constituents in the work material

  গ

  degree of strain hardening in the chip

  ঘ

  none of the mentioned
• Crater wear occurs mainly on the
  ক

  nose part, front relief face and side relief face of the cutting tool

  খ

  face of the cutting tool at a short distance from the cutting edge only

  গ

  cutting edge only

  ঘ

  front face only
• In determining the various forces on the chip, Merchant assumed that the
  ক

  cutting edge of the tool is sharp and it does not make any flank contact with the workpiece

  খ

  only continuous chip without built up edge is produced

  গ

  cutting velocity remains constant

  ঘ

  all of the mentioned
• In oblique cutting system, the maximum chip thickness
  ক

  occurs at the middle

  খ

  may not occur at the middle

  গ

  depends upon the material of the tool

  ঘ

  none of the mentioned
• The high cutting speed and large rake angle of the tool will result in the formation of
  ক

  continuous chips

  খ

  discontinuous chips

  গ

  continuous chips with built up edge

  ঘ

  none of the mentioned
• The factor responsible for the formation of discontinuous chips is
  ক

  low cutting speed and large rake angle

  খ

  low cutting speed and small rake angle

  গ

  high cutting speed and large rake angle

  ঘ

  high cutting speed and small rake angle
• Continuous chips with built up edge are formed during machining of
  ক

  brittle metals

  খ

  ductile metals

  গ

  hard metals

  ঘ

  soft metals
• Discontinuous chips are formed during machining of
  ক

  brittle metals

  খ

  ductile metals

  গ

  hard metals

  ঘ

  soft metals