CUTTING FLUIDS -LUBRICANTS OR COOLANTS MCQS

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CUTTING FLUIDS -LUBRICANTS OR COOLANTS MCQS

  1. In a cutting operation, the largest force is
  2. (a) axial or longitudinal force
    (b) tangential force
    (c) radial force
    (d) along shear plane
    (e) (a) and (b) above.

    tangential force

  3. When radial force in cutting operation is too large, it will cause
  4. (a) best finish
    (b) chatter and poor finish
    (c) finish has nothing to do with radial force
    (d) shorten tool life
    (e) all of the above.

    chatter and poor finish

  5. The cutting force is affected by
  6. (a) feed, speed and depth of cut
    (b) cutting tool angle
    (c) material hardness
    (d) type of lubricant
    (e) (a) and (c) above.

    (a) and (c) above.

  7. Titanium carbide coated tools
  8. (a) require frequent regrindings
    (b) require a few regrindings
    (c) require regrinding according to equipment
    (d) require no regrinding
    (e) none of the above.

    require regrinding according to equipment

  9. Tolerances on commonly used twist drill diameters are held quite close, averaging
  10. (a) +0.02 mm- 0.02 mm
    (b) +0, -0.02 mm
    (c) 0.0 mm, – 0 mm
    (d) +0.002 m, – 0.002 mm
    (e) +0, -0.2 mm.

    +0, -0.02 mm

  11. Drill diameter is measured over the
  12. (a) main body
    (b) plain shank portion
    (c) margins at the drill point
    (d) heel
    (e) lips.

    margins at the drill point

  13. Point angle of 90° on drills is used for
  14. (a) all general applications on mild steel
    (b) bakelite, hard rubber and fibrous plastics
    (c) hard steels and nickel alloys
    (d) thin sheet metal
    (e) there is no such criterion.

    bakelite, hard rubber and fibrous plastics

  15. An oversize hole will be produced in drilling, if
  16. (a) feed rate is very high
    (b) cutting speed is too low
    (c) lips of drill are of unequal length
    (d) unsufficient coolant is used
    (e) drill is not properly fixed.

    unsufficient coolant is used

  17. The most widely used material for drills, taps and reamers is
  18. (a) low alloy carbon steel
    (b) high speed steel
    (c) carbon steel
    (d) cemented carbide
    (e) ceramic.

    low alloy carbon steel

  19. Choose the correct statement A twist drill produces a hole of
  20. (a) fine finish
    (b) accurate size
    (c) exactly round
    (d) exactly positioned
    (e) none of the above.

    none of the above.

  21. The most suitable machine for drilling holes in rifle barrels is
  22. (a) ultrasonic machining
    (b) laser machining
    (c) radial drilling machine
    (d) deep hole drilling machine
    (e) plasma arc drilling.

    deep hole drilling machine

  23. Time taken to drill a hole through a 25 mm thickplate at 300 r.p.mat a feed rate of 0.25 mm/revolution will be
  24. (a) 10 sec
    (b) 20 sec
    (c) 25 sec
    (d) 40 sec
    (e) 50 sec.

    20 sec

  25. A twist drill is specified by
  26. (a) an alphabet specifying hole size
    (b) A number specifying hole size
    (c) the size of hole it can drill
    (d) any one of the above
    (e) none of the above.

    any one of the above

  27. The metal is removed in drilling operation by
  28. (a) work hardening of metal
    (b) compression
    (c) shearing
    (d) extrusion
    (e) shearing and extrusion.

    shearing and extrusion.

  29. The optimum lip angle of the twist drill for the work material of mild steel should be
  30. (a) 110
    (b) 108°
    (c) 118°
    (d) 120°
    (e) 181°

    118°

  31. A twist drill is specified by its shank, material and
  32. (a) diameter
    (b) lip angle
    (c) length of body
    (d) size of flute
    (e) all of the above.

    diameter

  33. The best way to check the sharpness of a drill of tungsten carbide-tipped bit is to
  34. (a) inspect it physically
    (b) test hardness
    (c) drill a test hole
    (d) judge its finish
    (e) rub it against a known surface.

    drill a test hole

  35. Quill in connection with drilling machine refers to
  36. (a) drill holding mechanism
    (b) keyway
    (c) rack
    (d) none of the above.
    (e) pinion

    keyway

  37. 4The helix angle on a HSS twist drill for drilling cast iron is of the order of
  38. (a) 14- 22°
    (b) 24 32
    (c) 35 -40°
    (d) 40- 45
    (e) 45- 55°

    24 32

  39. Twist fluted drills are preferred because
  40. (a) it cuts holes efficiently
    (b) it is a light weight tool
    (c) cutting lip is supported rigidly
    (d) it moves swiftly in the metal
    (e) chips move out automatically.

    chips move out automatically.

  41. A portable drilling machine is specified by
  42. (a) the size of the job it can hold
    (b) maximum diameter of drill it can hold
    (c) spindle speeds and feeds
    (d) maximum spindle travel
    (e) size of the table.

    maximum diameter of drill it can hold

  43. The important purpose of flutes in a drill is that they enable the
  44. (a) cutting fluid to enter the working zone
    (b) chips to come out
    (c) strength of the drill at the cutting point
    (d) weight of the drill to be reduced
    (e) cutting edges to be formed.

    cutting edges to be formed.

  45. The usual value of helix angle of a drill is
  46. (a) 10
    (b) 20°
    (c) 30°
    (d) 60°
    (e) 118

    30°

  47. The point angles and clearance angles of drills depend on
  48. (a) drill diameter
    (b) material to be drilled
    (c) r.p.mof the drill
    (d) depth of the hole to be drilled
    (e) type of lubricant used.

    material to be drilled

  49. The rake angle of a single point cutting tool corresponds to following angle of a twist drill
  50. (a) point angle
    (b) helix angle
    (c) lip diameter angle
    (d) chisel edge angle
    (e) primary angle.

    helix angle

  51. A twist drill is specified by
  52. (a) its diameter and lip angle
    (b) its material and shank
    (c) it shank and diameter
    (d) shank, material and flute size
    (e) shank, material and diameter.

    shank, material and diameter.

  53. All straight-shanked drills used in drill press work must be held in the
  54. (a) spindle of the drill press
    (b) key type drill chuck
    (c) tapers sleeve
    (d) vise
    (e) universal head.

    key type drill chuck

  55. Point angle of 118° on drills is used for
  56. (a) all general applications on mild steel
    (b) bakelite, hard rubber and fibrous plastics
    (c) hard steel and nickel alloys
    (d) thin steel metal
    (e) there is no such criterion.

    all general applications on mild steel

  57. Cutting fluid in drilling operation is used to
  58. (a) cool the work
    (b) cool the drill
    (c) aid in rapid removal of chips
    (d) improve the finish of the drilled hole
    (e) all of the above.

    all of the above.

  59. The work is usually rotated while the drill is fords int the work in
  60. (a) hand drilling machine
    (b) radial drilling machine
    (c) deep hole drilling machine
    (d) multiple spindle drilling machine
    (e) none of the above.

    deep hole drilling machine

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