MAINTAINANCE ENGINEERING – POLISHING, BUFFING , LAPPING AND HONING MCQS

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MAINTAINANCE ENGINEERING – POLISHING, BUFFING , LAPPING AND HONING MCQS

POLISHING, BUFFING , LAPPING AND HONING MCQS

  1. Shear angle varies with
  2. (a) different materials and with tool geometry
    (b) cutting speed
    (c) feed
    (d) machine used
    (e) none of the above.

    different materials and with tool geometry

  3. Continuous chips are formed when machining
  4. (a) ductile metal
    (b) brittle material
    (c) heat treated material
    (d) with lot of pressure and heat against the tool
    (e) none of the above.

    ductile metal

  5. A 5° taper over 5 mm length is to be made on a 100 mm diameter jobWhich method should be used ?
  6. (a) taper turning attachment
    (b) tailstock offset method
    (c) compound rest method
    (d) form tool method
    (e) any one of the above.

    form tool method

  7. Chip breakers are provided on cutting tools
  8. (a) for safety of operator
    (b) to minimise heat generation
    (c) to permit easy access of coolant at tool point
    (d) to permit short segmented chips
    (e) to increase tool life.

    to permit short segmented chips

  9. Tool life is said to be over when
  10. (a) finish of work becomes too rough
    (b) chips become blue
    (c) chattering starts
    (d) cutter looks dull
    (e) a certain amount of wear or cratering occurs on the flank.

    a certain amount of wear or cratering occurs on the flank.

  11. , In the Taylor equation T = C, value of index n is closely related to
  12. (a) cutting tool material
    (b) workpiece material
    (c) working conditions
    (d) temperature at chip tool interface
    (e) none of the above.

    workpiece material

  13. The relationship between the shear angle , friction angle 8 and cutting rake angle o, and the machining constant C for the work material is
  14. (a) 20 +B-a = C
    (b) 2a + B- = C
    (c) 28 + o = OC
    (d) 20 + a – ß = C
    (e) 20 + o +B = C.

    20 +B-a = C

  15. Wear limit on cutting tool is of the order of
  16. (a) 0.2 mm
    (b) 0.8 mm
    (c) 1.6 nmm
    (d) 2.5 mm
    (e) none of the above.

    0.8 mm

  17. With high speed steel tools, the maximum safe operating temperature is of the order of
  18. (a) 200°C
    (b) 540°C
    (c) 760°C
    (d) 870°Co
    (e) 1100°C

    540°C

  19. To remove maximum material per minute with the same tool life
  20. (a) increase depth of cut
    (b) increase feed rate
    (c) decrease cutting speed
    (d) increase cutting speed
    (e) all of the above.

    increase depth of cut

  21. The included angle between the land and the face of the tooth is called
  22. (a) lip angle
    (b) rake angle
    (c) relief angle
    (d) primary clearance angle
    (e) axial rake.

    lip angle

  23. Acutting tool having tool signature as 10, 10, 6, 6, 8, 8, 2 will have back angle as
  24. (a) 6°
    (b) 10°
    (c) 2°
    (d) 8°
    (e) none of the above.

    10°

  25. The last element in the tool signature is
  26. (a) side rake angle
    (b) back rake angle
    (c) end cutting edge angle
    (d) nose radius
    (e) side-relief angle.

    nose radius

  27. As cutting speed increases, the built up edge
  28. (a) becomes smaller and finally does not form at all
    (b) becomes bigger
    (c) has nothing to do with speed
    (d) may or may not form depending on other conditions
    (e) none of the above.

    becomes smaller and finally does not form at all

  29. Carbide tools wear out faster at
  30. (a) medium speeds
    (b) slow speeds
    (c) very fast speeds
    (d) fast speeds
    (e) speed is no criterion for wear.

    medium speeds

  31. Which of the following tools are harder and more wear resistant than tungsten carbide but are weaker in tension?
  32. (a) low carbon steel tools
    (b) high carbon steel tools
    (c) H.S.Stools
    (d) ceramic tools
    (e) none of the above

    ceramic tools

  33. Ceramic tips are prepared from
  34. (a) tungsten powder
    (b) carbon powder
    (c) aluminium oxide powder
    (d) silicon carbide powder
    (e) H.S.Spowder.

    aluminium oxide powder

  35. Which of the following are cast alloys containing tungsten and chromium carbides in a matrix of cobalt and chromium ?
  36. (a) mechanites
    (b) tungsten carbides
    (c) bakelites
    (d) stellites
    (e) ceramics.

    stellites

  37. Carbide tips are fixed to the shanks of cutting tools by
  38. (a) forging
    (b) sintering
    (c) welding
    (d) soldering
    (e) brazing.

    brazing.

  39. The most wear-resistant grade of carbide used for cutting tools is the straight
  40. (a) iron carbide
    (b) calcium carbide
    (c) tungsten carbide
    (d) nickel carbide
    (e) aluminium carbide.

    tungsten carbide

  41. With increase in cutting speed, the finish
  42. (a) improves considerably
    (b) improves slightly
    (c) remains same
    (d) gets poor
    (e) gets poor or improves depending on work material.

    improves slightly

  43. When turning a long shaft on a lathe, its bending can be prevented by
  44. (a) running the shaft at low speed
    (b) using low feed
    (c) using low depth of cut
    (d) using sturdy machine
    (e) using steady rest.

    running the shaft at low speed

  45. In oblique cutting system, the chip thickness is
  46. (a) maximum at middle
    (b) maximum at sides
    (c) minimum at middle
    (d) uniform throughout
    (e) none of the above.

    maximum at middle

  47. Finish is more affected by
  48. (a) cutting speed
    (b) depth of cut
    (c) feed-rate
    (d) lubricant
    (e) none of the above.

    feed-rate

  49. Best method of increasing the rate of removing metal
  50. (a) increase feed-rate
    (b) increase speed
    (c) increase depth of cut
    (d) increase nose radius
    (e) supply more quantity of lubricant.

    increase depth of cut

  51. The width of tape by which numerical control machines are controlled is
  52. (a) 10 mm
    (b) 20 mm
    (c) 25 mm
    (d) 50 mm
    (e) 100 mm.

    20 mm

  53. Number of tracks on tape as per EIA standard are
  54. (a) 4
    (b) 6
    (c) 8
    (d) 10
    (e) 12

    8

  55. Photo-electric tape readers are capable of reading
  56. (a) 100 rows/sec on tape upto
    (b) 10 rows/sec on tape
    (c) 300 rows/sec on tape
    (d) 3000 rows/sec one tape
    (e) none of the above.

    300 rows/sec on tape

  57. A block’ of information means
  58. (a) one row on tape
    (b) a word, comprising several rows on tape
    (c) initial portion of tape
    (d) complete instruction
    (e) complete programming for a job.

    complete instruction

  59. Cemented carbide tools wear faster at
  60. (a) very high speed
    (b) high speed
    (c) very low speed
    (d) medium speed
    (e) none of the above.

    very low speed

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Cover Topic

“polishing teeth”,”buffing machine”,”lapping process”

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