MACHINING ELECTRO DISCHARGE MACHINING MCQS

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MACHINING ELECTRO DISCHARGE MACHINING MCQS

MACHINING ELECTRO DISCHARGE MACHINING MCQS

  1. Point angle of 135° on drills is used for
  2. (a) all applications on M.S.
    (b) bakelite, hard rubbers and fibrous plastics
    (c) hard steels and nickel alloys
    (d) thin sheet metal
    (e) c) and (d) above.

    c) and (d) above.

  3. For drilling aluminium, a drill with
  4. (a) high helix angle is required
    (b) low helix angle is required
    (c) any helix angle can be used
    (d) zero helix angle is required
    (e) none of the above.

    high helix angle is required

  5. For drilling glass, slate, ceramic and masonry, following drill is used
  6. (a) twist drill
    (b) spade bit
    (c) tungsten carbide-tipped bit
    (d) auger
    (e) hardened steel dril.

    tungsten carbide-tipped bit

  7. When the lip clearance of a drill is too small, i.ewhen it requires resharpening
  8. (a) it will drill a bigger hole
    (b) it will drill an eccentric hole
    (c) it will drill and elliptical hole
    (d) it will drill a rough hole
    (e) drill will not be able to enter the work.

    drill will not be able to enter the work.

  9. The twist drill works by
  10. (a) being forced through the material
    (b) rotating against the material with sufficient pressure to cause it to penetrate the material
    (c) rotating against the material and being pulled through by spiral of the flutes
    (d) all of the above
    (e) none of the above.

    rotating against the material with sufficient pressure to cause it to penetrate the material

  11. The rake angle of single point cutting tool is equivalent to
  12. (a) helix angle of a twist drill
    (b) the lip angle of twist drill
    (c) end cutting edge angle of a twist drill
    (d) the relief angle of a twist drill
    (e) none of the above.

    helix angle of a twist drill

  13. For drilling brass, a drill with
  14. (a) high helix angle is required
    (b) low helix angle is required
    (c) any helix angle can be used
    (d) zero helix angle is required
    (e) none of the above.

    low helix angle is required

  15. To provide a positive drive, all taper shanked drills are provided with
  16. (a) sleeve
    (b) socket
    (c) tang
    (d) neck
    (e) head.

    tang

  17. If a drill does not cut, the probable cause could be that
  18. (a) material is hard
    (b) speed is low
    (c) no lubricant is used
    (d) drill is blunt
    (e) drill is not mounted properly.

    drill is blunt

  19. Which portion of a taper shank drill prevents drill from slipping and thus ensures a positive drive ?
  20. (a) sleeve
    (b) socket neck
    (c) tang
    (d) flutes.
    (e) none of the Above

    tang

  21. If a drill breaks when drilling a soft and tough material, it could be due to
  22. (a) low speed
    (b) blunt drill
    (c) hard drill
    (d) obstruction of flute of drill by chips
    (e) no lubricant.

    obstruction of flute of drill by chips

  23. To reduce the feeding pressure needed for drilling larger holes, it is a good practice first to
  24. (a) anneal the workpiece
    (b) drill a countersunk hole
    (c) drill a small pilot hole
    (d) drill a stepped hole
    (e) mark a centre hole.

    drill a small pilot hole

  25. A drill having flat side and two cutting edges for drilling large holes is called
  26. (a) micro-drill
    (b) spade drill
    (c) boring tool
    (d) counter-boring tool
    (e) deep hole drill.

    spade drill

  27. Kerosene is a good cutting fluid to use when drilling
  28. (a) cast iron
    (b) mild steel
    (c) aluminium
    (d) brass
    (e) bronze.

    aluminium

  29. The taper usually employed in drill sleeves is known as
  30. (a) Girling taper
    (b) Morse taper
    (c) Brown and Sharpe taper
    (d) 1:1 taper
    (e) metric taper.

    Morse taper

  31. A taper shank drill is removed from the drill spindle by
  32. (a) tapping the drill by a hammer
    (b) a screw driver
    (c) a draft
    (d) a drift
    (e) a tang.

    a drift

  33. Oversized holes in drilling are caused by
  34. (a) equal lengths of lips
    (b) unequal length of lips
    (c) larger helix angle
    (d) smaller helix angle
    (e) wornout drills.

    unequal length of lips

  35. When the cutting lips of a drill are uneven in length, the drill will cut a
  36. (a) larger hole than the drill size
    (b) small hole than the drill size
    (c) same size hole as the drill size
    (d) unpredictable
    (e) none of the above.

    larger hole than the drill size

  37. The flutes of a drill perform the following function
  38. (a) help form the cutting edge of the drill point
    (b) curb the chip tightly for easier removal
    (c) form channels through which the chips can escape firom the hole being drilled
    (d) allow the coolant and lubricant to get down to the cutting edge
    (e) all of the above.

    all of the above.

  39. For reaming operation in blind hole, following type of reamer should be used
  40. (a) straight flute reamer
    (b) right hand spiral fluted reamer
    (c) left hand spiral fluted reamer
    (d) any one of the above
    (e) none of the above.

    right hand spiral fluted reamer

  41. Drills are usually made of
  42. (a) plain high-carbon tool steel
    (b) high-speed steel
    (c) alloy steel
    (d) cast alloys.
    (e) tungsten carbide

    high-speed steel

  43. A boring tool for boring a hole over a large length should have
  44. (a) one tool bit on a bar
    (b) 2 tool bits fitted on diametrically opposite sides of bar
    (c) 3 tool bits equally spaced
    (d) 4 or more tool bits
    (e) none of the above.

    2 tool bits fitted on diametrically opposite sides of bar

  45. The machining process which makes a cone-shaped recess at the top of a drilled hole for a flat head machine screw is called:
  46. (a) die-sinking
    (b) counter-boring
    (c) counter-sinking
    (d) taper drilling
    (e) spot-facing.

    counter-sinking

  47. The groove in the body of the drill which allows the chips to come out is known as
  48. (a) chip breaker
    (b) lip
    (c) flute
    (d) margin
    (e) chip-follower

    flute

  49. Which is correct statement? A twist drill
  50. (a) should not be relied on for accurately sized holes
    (b) can be relied on for accurately sized holes
    (c) capability for production of accurately sized holes depends on its condition
    (d) is most commonly used for production accurately sized holes
    (e) none of the above.

    should not be relied on for accurately sized holes

  51. The reamer is always removed from the finished holes
  52. (a) by reversing the drill press
    (b) by stopping the machine before removing the reameT
    (c) by slowing the machine before removing the reamer
    (d) before stopping the machine
    (e) none of the above.

    before stopping the machine

  53. For reaming copper or soft aluminium, following typee of reamer should be used:
  54. (a) straight flute reamer
    (b) right hand spiral fluted reamer
    (c) left hand spiral fluted reamer
    (d) any one of the above
    (e) none of the above.

    left hand spiral fluted reamer

  55. The operation of providing a smooth seat or bearing surface around a previously drilled hole fora washer or nut is called
  56. (a) counter-boring
    (b) boring
    (c) spot-facing
    (d) counter-sinking
    (e) chamfering.

    spot-facing

  57. Broken bolts and studs can be removed from hole by the following tool
  58. (a) screw driver
    (b) Ezy-out
    (c) telescopic rod
    (d) cold punch
    (e) emery rod.

    Ezy-out

  59. The operation of making a recess at the top of a drilled hole for a flat-head machine screw is called
  60. (a) boring
    (b) counter-sinking
    (c) micro-boring
    (d) reaming
    (e) spot-facing.

    counter-sinking

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