elements in machine design (j.t.) module 16

7/28/2019 Elements in Machine Design (j.t.) Module 16

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ELEMENTS IN MACHINE DESIGN (J.T.) MODULE 16

1. The larger of two interacting gears.a. Gearb. Hubc. Piniond. Bevel

2. The smaller gear in a pair.a. Wheelb. Pinionc. Miterd. Rack

3. The path followed by the point of contact between twomeshing gear teeth.

a. Gear contactb. Angle of contactc. Contact med. Path of contact

4. In spur gearing, another term for line of action is called:a. Gear actionb. Pressure linec. Angle of actiond. Center line

5. The line along which the force between two meshinggear teeth is directed. In general, it changes from

moment to moment during the period of engagement of

pair of teeth.

a. Line of actionb. Pressure anglec. Angle of contactd. Radial line

6. The axis of revolution of the gear or center line of theshaft.

a. Pitch pointb. Pitch linec. Axisd. Shaft line

7. The point where the line of action crosses a line joiningthe two gear axes.

a. Gear pointb. Pitch pointc. Pitch surfaced. Action line point

8. A circle, centered on and perpendicular to the axis, andpassing through the pitch point.

a. Pitch circleb. Diametral pitchc. Axial surfaced. Center point

9. In spur gearing, another term for pitch circle is called:a. Diametral pitchb. Pitch diameterc. Line of actiond. Pitch line

10. Diameter of a pitch circle and is equal to twice theperpendicular distance from the axis to the pitch point.

a. Diametral pitchb. Perpendicular pitchc. Axial pitchd. Pitch diameter

11. The module of a gear is equal to the pitch diametedivided by the number of teeth.

a. Moduleb. Pitch diameterc. Diametral pitchd. Circular pitch

12. The pitch diameter determined from the number ofteeth and the center distance at which gears operate.

a. Operating pitch diameterb. Operating diametral pitchc. Axial pitch diametersd. Radial vectors

13. For cylindrical gears, this is the cylinder formed byprojecting a pitch circle in the axial direction.

a. Axial pitchb. Pitch surfacec. Circular pitchd. Root cylinder

14. Angle with vertex at the gear center, one leg on the poinwhere mating teeth first make contact, the other leg on

the point where they disengage.

a. Center angleb. Vertical anglec. Angle of actiond. Vertex action

15. The segment of a pitch circle subtended by the angle ofaction.

a. Angular forceb. Pitch anglec. Angle of actiond. Arc of action16. The complement of the angle between the direction thatthe teeth exert force on each other, and the line joining

the centers of the two gears.

a. Pitch angleb. Pressure anglec. Central angled. Mating angle

17. For involute gears, the teeth always exert force along theline of action, and thus, for involute gears, the pressure

angle is:

a. Constantb. Variablec. Fixedd. Equal

18. Diameter of the gear, measured from the tops of theteeth.

a. Outside diameterb. Pitch diameterc. Root diameterd. Base diameter


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19. Diameter of the gear, measured from the base of thetooth space.

a. Base diameterb. Root diameterc. Central diameterd. Tooth diameter

20. The radial distance from the pitch surface to the outermost point of the tooth.

a. Addendumb. Dedendumc. Chordd. Tooth thickness

21. The radial distance from the depth of the tooth throughto the pitch surface.

a. Addendumb. Dedendumc. Chordal thicknessd. Circular thickness

22. The total depth of a tooth space, equal to addendumplus dedendum, also equal to working depth plus

clearance.

a. Working depthb. Whole depthc. Tooth spaced. Pitch surface

23. The distance between the root circle of a gear and theaddendum circle of its mating gear.

a. Backlashb. Root diameterc. Clearanced. Addendum

24. The depth of engagements of two gears, that is, the sumof their operating addendums.

a. Working depthb. Whole depthc. Tooth depthd. Tooth thickness

25. The distance from one face of a tooth to thecorresponding face of an adjacent tooth on the same

gear, measured along the pitch circle.

a. Pitch circleb. Circular pitchc. Diametral pitchd. Axial pitch

26. The ratio of the number of teeth to the pitch diameter.a. Pitch circleb. Circular pitchc. Diametral pitchd. Axial pitch

27. Applies only to involute gears, where the tooth profile isthe involute of this circle. The circle is termed as

a. Base circleb. Addendum circlec. Pitch circled. Circular pitch

28. Applies only to involute gears. It is the distance from oneface of a tooth to the corresponding face of an adjacent

tooth on the same gear, measured along the base circle.

a. Base pitchb. Addendum pitchc. Pitch circled. Circular pitch

29. Contact between teeth other than at the intended partsof their surfaces.

a. Interferenceb. Diametral tolerancec. Allowanced. Surface

30. The angle between a tangent to the helix and the gearaxis.

a. Helix angleb. Gear anglec. Axial angled. Pitch angle

31. Circular pitch in the plane normal to the teeth.a. Radial circular pitchb. Base circular pitchc. Plane pitchd. Normal circular pitch

32. Circular pitch in the plane of rotation of the gear.a. Radial circular pitchb. Base circular pitchc. Transverse circular pitchd. Normal circular pitch

33. The distance from any point on a thread to thecorresponding point on the next turn of the same thread

measured parallel to the axis.

a. Pitchb. Leadc. No. Of threads per inchd. Lineal diametral pitch

34. The distance from any point on a thread to thecorresponding point on the adjacent thread, measured

parallel to the axis.

a. Circular pitchb. Leadc. No. Of threads per inchd. Lineal pitch

35. The angle between a tangent to the helix and a planeperpendicular to the axis.

a. Pitch angleb. Lead anglec. Plane angled. Lineal angle

36. For involute gear, parallel-axis gears with either spur ohelical teeth, is the rectangular area in the plane o

action bounded by the length of action and the effective

face width.

a. Zone of actionb. Path of actionc. Length of action


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d. Involute action37. It is the straight line passing through the pitch point and

tangent to both base circles.

a. Zone of actionb. Plane of actionc. Length of actiond. Line of action

38. The imaginary surface in which contact occurs betweentwo engaging tooth surfaces.

a. Surface of actionb. Plane of actionc. Length of actiond. Line of action

39. The distance of the line of action through which the pointof contact moves during the action of the tooth profile.

a. Length of actionb. Plane of actionc. Surface of actiond. Arc of action

40. The arc of the pitch circle through which a tooth profilemoves from the beginning to the end of contact with a

mating profile.

a. Length of actionb. Plane of actionc. Surface of actiond. Arc of action

41. The arc of the pitch circle through which a tooth profilemoves from its beginning of contact until the point of

contact arrives at the pitch point.

a. Length of actionb. Arc of approachc. Arc of recessd. Arc of action

42. The arc of the pitch circle through which a tooth profilemoves from contact at the pitch point until contact ends.a. Length of actionb. Arc of approachc. Arc of recessd. Arc of action

43. The number of angular pitches through which a toothsurface rotates from the beginning to the end of contact.

a. Pitch ratiob. Contact ratioc. Tooth ratiod. Speed ratio

44. The contact ratio in a transverse plane. It is the ratio ofthe angle of action to the angular pitch.

a. Pitch ratiob. Transverse contact ratioc. Contact ratiod. Speed ratio

45. The contact ratio in an axial plane, or the ratio of the facewidth to the axial pitch. For bevel and hypoid gears it is

the ratio of face advance to circular pitch.

a. Pitch ratiob. Transverse contact ratio

c. Face contact ratiod. Speed ratio

46. The sum of the transverse contact ratio and the facecontact ratio.

a. Pitch ratiob. Transverse contact ratioc. Face contact ratiod. Total contact ratio

47. For bevel gears is the square root of the sum of thesquares of the transverse and face contact ratios.a. Modified contact ratiob. Transverse contact ratioc. Face contact ratiod. Square contact ratio

48. The diameter on a gear at which the line of actionintersects the maximum addendum circle of the mating

gear.

a. Maximum diameterb. Limit diameterc. Minimum diameterd. Pitch diameter

49. The intersection of the limit diameter and the involuteprofile.

a. The start of active profileb. The end of active profilec. The start of contactd. The end of contact

50. The distance on a pitch circle through which a helical orspiral tooth moves from the position at which contact

begins at one end of the tooth trace on the pitch surface

to the position where contact ceases at the other end.

a. Face advanceb. Root advancec. Positioningd. Starting51. The error in motion that occurs when gears changedirection.

a. Backlashb. Tolerancec. Clearanced. All of these

52. The curve of intersection of a tooth surface and a planeor surface normal to the pitch surface.

a. Tooth spaceb. Tooth profilec. Pitch surfaced. None of these

53. The concave portion of the tooth profile where it joinsthe bottom of the tooth space.

a. Tooth profileb. Tooth spacec. Fillet curved. Top curve

54. Is a condition in generated gear teeth when any part ofthe fillet curve lies inside of a line drawn tangent to the

working profile at its point of juncture with the fillet.


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a. Tooth profile cutb. Undercutc. Fillet cutd. Transverse point

55. The distance between a point on one tooth and thecorresponding point on an adjacent tooth.

a. Pitchb. Diametral pitchc. Tooth lined. Chordal pitch

56. The arc distance along a specified pitch circles or pitchline between corresponding profiles of adjacent teeth.

a. Circular pitchb. Diametral pitchc. Tooth spaced. Tooth line

57. Normal circular pitch is the circular pitch in the normalplane, and also the length of the arc along the normal

pitch helix between helical teeth or threads.

a. Normal circular pitchb. Normal diametral pitchc. Normal pitch helixd. Helical tooth line

58. The linear pitch in an axial plane and in a pitch surface.a. Axial pitchb. Lineal pitchc. Plane pitchd. Radial pitch

59. The angle subtended by the circular pitch, usuallyexpressed in radians.

a. Circular pitchb. Angular pitchc. Radian pitchd. Arc pitch

60. The length of arc between the two sides of a gear tooth,on the specified datum circle.a. Circular thicknessb. Axial thicknessc. Radial thicknessd. Chordal thickness

61. The circular thickness in the transverse plane.a. Normal circular thicknessb. Axial thicknessc. Radial thicknessd. Transverse circular thickness

62. The circular thickness in the normal plane. In a helicalgear it may be considered as the length of arc along a

normal helix.

a. Normal circular thicknessb. Axial circular thicknessc. Radial thicknessd. Transverse circular thickness

63. In helical gears and worms is the tooth thickness in anaxial cross section at the standard pitch diameter.

a. Normal circular thicknessb. Axial thickness

c. Radial thicknessd. Transverse circular thickness

64. In involute teeth is the length of arc on the base circlebetween the two involute curves forming the profile of a

tooth.

a. Normal circular thicknessb. Axial thicknessc. Base circular thicknessd. Transverse circular thickness

65. The length of the chord that subtends a circular thicknessarc in the plane normal to the pitch helix.

a. Normal circular thicknessb. Axial thicknessc. Chordal thicknessd. Transverse circular thickness

66. The height from the top of the tooth to the chordsubtending the circular thickness arc.

a. Addendumb. Chordal addendumc. Axial addendumd. Total height

67. The displacement of the basic rack datum line from thereference cylinder, made non-dimensional by dividing by

the normal module.

a. Arc shiftb. Speed shiftc. Profile shiftd. Angle shift

68. The displacement of the tool datum line from thereference cylinder, made non-dimensional by dividing by

the normal module.

a. Rack shiftb. Speed shiftc. Profile shiftd. Angle shift69. The measurement of the distance taken over a pinpositioned in a tooth space and a reference surface.

a. Measurement over pinsb. Pin pitchc. Surface pitchd. Space pitch

70. The measurement of the distance across several teeth ina normal plane.

a. Span measurementb. Length of arcc. Tooth lengthd. Normal length

71. Gears whose teeth have a working depth equal 2.000divided by the normal diametral pitch.

a. Stub teethb. Normal teethc. Full-depth teethd. Long teeth

72. Gears whose teeth have a working depth is less than2.000 divided by the normal diametral pitch.

a. Stub teeth


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b. Normal teethc. Full-depth teethd. Long teeth

73. Two engaging gears have equal addendums.a. Identical gearsb. Miter gearsc. Same teethd. Equal addendum teeth

74. A type of gear with the teeth formed on the outersurface of a cylinder or cone.a. Internal gearb. Hypoid gearc. Rack geard. External gear

75. A type of gear with the teeth formed on the inner surfaceof a cylinder or cone.

a. Internal gearb. Hypoid gearc. Rack geard. External gear

76. The simplest and most common type of gear. Theirgeneral form is a cylinder or disk. The teeth project

radially, and straight-cut gears.

a. Spur gearsb. Helical gearsc. Worm gearsd. Bevel gears

77. A type of gear in which the teeth are not parallel to theaxis of rotation, but are set at an angle.


78. A type of helical gear that is used to overcome theproblem of axial thrust presented by single helical gearsby having teeth that set in a V shape.

a. Miter gearsb. Herringbone gearsc. Worm wheelsd. Bevel gears

79. Bevel gears with equal numbers of teeth and shaft axesat 90 degrees are called:

a. Miter gearsb. Herringbone gearsc. Worm wheelsd. Zero bevel gears

80. A type of gears that are essentially conically shaped,although the actual gear does not extend all the way to

the vertex of the cone that bounds it.


81. A type of bevel gear having teeth that are both curvedalong their length.

a. Miter gears

b. Herringbone gearsc. Spiral bevel gearsd. Zero bevel gears

82. A type of bevel gear having teeth which are curved alongtheir length, but not angled.

a. Miter gearsb. Herringbone gearsc. Spiral bevel gearsd. Zero bevel gears

83. A particular form of bevel gear whose teeth project atright angles to the plane of the wheel.

a. Miter gearsb. Crown gearsc. Spiral bevel gearsd. Herringbone gears

84. A gear that resemble spiral bevel gears, except that theshaft axes are offset, not intersecting.

a. Bevel gearb. Worm gearc. Crown geard. Hypoid gear

85. A gear that resembles a screw. It is a species of helicagear, but its helix angle is usually somewhat large and its

body is usually fairly long in the axial direction.

a. Bevel gearb. Worm gearc. Crown geard. Hypoid gear

86. Helical gears are, in practice, limited to gear ratios ofa. 10:1 and underb. 10:1 and overc. 100:1 and underd. 100:1 and over

87. Worm gear sets commonly have gear ratios betweena. 10:1 and 20:1b. 10:1 and 100:1c. 20:1 and 50:1d. 20:1 and 40:1

88. A toothed bar or rod that can be thought of a sector geawith an infinitely large radius of curvature.

a. Worm wheelb. Miter gearc. Rack geard. Ring gear

89. The type of gear used to connect shafts that are in thesame plane and parallel. The teeth are cut straight and

parallel to the axis of the shaft rotation.

a. Spur gearb. Miter gearc. Wheeld. Bevel gear

90. A type of gear used to change rotary motion to linearmotion or linear motion to rotary motion.

a. Worm and worm gearb. Bevel and spurc. Rack and pinion


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d. Rack and bevel91. Not enough backlash will cause early failure

a. Due to overloadingb. Heat due to improper lubrication and bindingc. Fatigue of tooth surfacesd. All of these

92. When an external gear is meshed with an internal gearthe gears will rotate in:

a. Same directionb. Opposite directionc. Will not rotated. None of the above

93. Refers to the surface of the gear between the fillets ofadjacent teeth:

a. Top landb. Bottom landc. Pitchd. Fillet

94. Effective face width of a helical gear divided by gear axialpitch.

a. Face overlapb. Teeth overlapc. Land overlapd. Pitch overlap

95. The curve formed by the path of a point on a straight lineas it rolls along a convex base curve.

a. Involuteb. Trochoidc. Cycloidd. Fillet

96. The curve formed by the path of a point on the extensionof a circle as it rolls along a curved or line.

a. Trochoidb. Involutec. Cycloidd. Undercut

97. Herringbone gears are gears which:a. Do not operate on parallel shaftsb. Have a line contact between the teethc. Consist of two left handed helical gearsd. Tend to produce and trust on the shafts

98. Addendum of a cycloidal gear tooth is:a. Cycloidb. Straight rackc. Epicycloidsd. Involute

99. For an evenly distributed and uniform wear on eachmeshing gear tooth, the ideal design practice is to

consider a ___.

a. Wear resistance alloy addition to tooth gearsb. Heat treatment of the gearsc. Hardening of each roomd. Hunting tooth addition

100.In case of spur gears the flank of the tooth is:a. The part of the tooth surface lying below the pitch

surface

b. The curve forming face and flankc. The width of the gear tooth measured axially along

the pitch surface

d. The surface of the top of the tooth- End -

elements in machine design (j.t.) module 16

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