Elements 8

1. What is an imaginary circle passing through the points at which the teeth of meshing gears contact each other?
A. pitch circle
B. addendum circle
C. dedendum circle
D. base circle

2. What is the number of teeth per inch of pitch diameter, giving indications of the size of the gear teeth?
A. module
B. pitch circle
C. diametral pitch
D. circular pitch

3. What is the distance from the center of one gear tooth to the center of the next measured on the pitch circle?
A. circular pitch
B. module
C. diametral pitch
D. pitch circle

4. What is the portion of a gear tooth that projects above the pitch circle?
A. top relief
B. dedendum
C. addendum
D. tooth space

5. What is the portion of the gear tooth space cut below the pitch circle, equal to the addendum plus the clearance?
A. top root
B. dedendum
C. addendum
D. top land

6. What kind of gear is used for heavy-duty works requiring a large speed ratio and extensively used in speed reducers?
A. bevel gears
B. worm gears
C. helical gears
D. spiral gears

7. What kind of gear is used to transmit motion from one shaft to another at an angle?
A. bevel gears
B. worm gears
C. helical gears
D. spiral gears

8. What is the clearance between the tooth profiles of a gear tooth?
A. tooth space
B. backlash
C. flank
D. width

9. What is the addendum of a cycloidal gear tooth?
A. cycloid
B. epicycloid
C. straight rack
D. involute

10. What is the train value of a gear train?
A. equal to the speed ratio
B. double the speed ratio
C. half of the speed ratio
D. reciprocal of the speed ratio

11. What is a gear with teeth on the outer cylindrical surface?
A. outer gear
B. external gear
C. spiral gear
D. helical gear

12. What is the diameter of a circle coinciding with the top of the teeth of an internal gear?
A. pitch diameter
B. root diameter
C. internal diameter
D. central diameter

13. What is a circle coinciding with a tangent to the bottom of the tooth space?
A. root circle
B. pitch circle
C. addendum circle
D. great circle

14. What is the ratio of the pitch diameter to the number of teeth?
A. diametral pitch
B. module
C. contact ratio
D. helical overlap

15. What is the total depth of a tooth space, equal to addendum plus dedendum?
A. full depth
B. working depth
C. whole depth
D. dedendum

16. What is the depth of tooth space below the pitch circle?
A. dedendum
B. working depth
C. full depth
D. tooth depth

17. What is the number of gear teeth per mm of pitch diameter?
A. diametral pitch
B. module
C. circular pitch
D. English module

18. What is a circle with a radius equal to the distance from the gear axis to the pitch point?
A. pitch circle
B. root circle
C. base circle
D. outside circle

19. For moderate speed of mating gears, what is the ideal ratio of contact?
A. 1.35 - 1.55
B. 1.0 - 1.3
C. 1.25 - 1.45
D. 1.25 - 4.0

20. In which type of gears is zero axial thrust experienced?
A. herringbone gears
B. helical gears
C. bevel gears
D. worm gears

21. Gears for wristwatches are generally manufactured by?
A. molding
B. stamping
C. galvanizing
D. honing

22. Spiral gears are suitable for transmitting?
A. any power
B. small power
C. huge power
D. pulsating power

23. What is the orientation of the axes of the two shafts in cross helical worm gears?
A. parallel
B. non-parallel
C. intersecting
D. non-parallel and non-intersecting

24. In usual spur gearing, what is the addendum?
A. one module
B. 2.16 x module
C. 1.57 x module
D. 1.25 / module

25. What is usually the tooth outline in usual spur gearing?
A. Pitch circle and base circle are the same
B. Working depth includes the clearance
C. Tooth outline is usually involute curves
D. Tooth outline is always cycloidal curves

26. What is the space between adjacent gear teeth?
A. tooth
B. flank
C. backlash
D. width

27. Gears used to transmit power between shafts with intersecting axes are called?
A. spur gears
B. bevel gears
C. helical gears
D. straight bevel gears

28. If gears cannot connect parallel shafts, they are called?
A. cycloidal gears
B. helical gears
C. spur gears
D. toothed gears

29. What is the path traced by a point moving at a fixed distance from an axis and with a uniform motion to the axis?
A. helical motion
B. spherical motion
C. translational
D. path of a point

30. Gearing in which motion or power depends on the friction between the surfaces in contact is called?
A. bevel gears
B. spur friction wheels
C. Evans friction cones
D. friction gearing

31. Bevel gears of the same size mounted on a shaft at 90 degrees are called?
A. crown gears
B. spur gears
C. angular gears
D. miter gears

32. A gear in which the angle is 90 degrees, and the pitch cone has become a plane is called?
A. crown gear
B. angular gear
C. miter gear
D. spiral gear

33. What is the length of the arc between the two sides of a gear tooth on the pitch circle?
A. circular thickness
B. axial plane
C. helix angle
D. chordal curves

34. What type of gear tooth is cut inside a cylinder or ring?
A. rack gear
B. ring gear
C. miter gear
D. internal gear

35. What is a double helical type of gear commonly used in parallel-shaft transmission, especially when a smooth, continuous action is essential in high-speed drives?
A. bevel gear
B. herringbone gear
C. spur gear
D. miter gear

36. What is the reciprocal of the diametral pitch, equivalent to the ratio of pitch diameter to the number of teeth?
A. lead
B. clearance
C. module
D. involute

37. In a pair of gears, what is the plane perpendicular to the axial plane and tangent to the pitch surface?
A. pitch
B. pitch plane
C. pitch circle
D. pitch point

38. What type of gear is used for high-speed operation?
A. helical
B. spur
C. bevel
D. worm

39. Hypoid gear is a special type of gear like?
A. Worm gear
B. Spur gear
C. Herringbone gear
D. Bevel gear

40. What is the distance a helical gear or worm would thread along its axis in one revolution if it were free to move axially called?
A. length of action
B. length of contact
C. land
D. lead

41. What is the difference between the width of a tooth space and the thickness of the engaging tooth on the pitch circles?
A. backlash
B. clearance
C. undercut
D. chordal thickness

42. What will be the effect in bushing gears without backlash?
A. jamming
B. overheating
C. overload
D. all of these

43. What is the range of helix angle on helical gears?
A. less than 18
B. 15-25
C. 20-35
D. 35-40

44. What refers to the surface of the gear between the fillets of adjacent teeth?
A. top land
B. bottom land
C. pitch
D. fillet

45. What is a plane perpendicular to the axial plane and to the pitch plane, coinciding in gears with parallel axes?
A. transverse plane
B. principal reference plane
C. normal plane
D. pitch plane

46. What is used to change rotary motion to reciprocating motion?
A. Helical gear
B. Rack gear
C. Worm gear
D. Spur gear

47. What type of gear is used to transmit power at high velocity ratios between non-intersecting shafts, usually at right angles?
A. helical gear
B. bevel gear
C. worm gear
D. spiral gear

48. For evenly distributed and uniform wear on each meshing gear tooth, what is the ideal design practice?
A. wear resistance alloy addition to tooth gear
B. heat treatment of the gears
C. hardening of each tooth
D. hunting tooth addition

49. In involute teeth, the pressure angle is often defined as the angle between the line of action and the line of tangent to the pitch circle. It is also termed as?
A. helix angle
B. angle of recess
C. angle of obliquity
D. arc of action

50. What is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles?
A. backlash
B. clearance
C. undercut
D. chordal thickness

51. What accounts for the backlash of spur gears?
A. Both module and pitch line velocity
B. Pitch line velocity
C. Module
D. Tooth profile

52. Which type of gears are used for shaft axes have an offset?
A. Hypoid gear
B. Zero gear
C. Spiral Bevel gear
D. Mitre gear

53. What is the angle, at the base cylinder of an involute gear, that the tooth makes with the gear axis called?
A. base helix angle
B. pressure angle
C. arc of recess
D. arc of approach

54. What is the path of contact involute gears where the force/power is actually transmitted?
A. principal reference plane
B. pitch point
C. front angle
D. line of action

55. What is the arbitrary modification by removing a small portion of a tooth material at the tip of the gear tooth called?
A. tip removal
B. tip undercut
C. tip relief
D. pressure angle cut

56. What is the concave portion of the tooth profile where it joins the bottom of the tooth space?
A. fillet curve
B. fillet radius
C. bottom depth
D. fillet diameter

57. In gear design, what is the ratio of the pitch diameter in inches to the number of teeth called?
A. module
B. diametral pitch
C. English module
D. circular pitch

58. What is the effective face width of a helical gear divided by the axial pitch, sometimes called face overlap?
A. Angle overlap
B. Axial overlap
C. Contact overlap
D. Helical overlap

59. What curve is formed by the path of a point on a straight line as it rolls along a convex base curve, usually used as the profile of gear tooth?
A. axial plane
B. arc of recess
C. involute
D. arc of action

60. What is a plane perpendicular to the axial plane and to the pitch plane, coinciding in gears with parallel axes?
A. tangent plane
B. transverse
C. straight plane
D. reference plane

61. What is a single measure that combines the external dynamic load of an application with a gear drive's reliability and operating life?
A. ratio factor
B. reliability factor
C. service factor
D. life factor

62. How do you call the circle bounding the bottom of the teeth?
A. addendum circle
B. addendum cylinder
C. pitch circle
D. dedendum circle

63. What is the difference between the width of a tooth space and the thickness of the engaging tooth on the pitch circles?
A. backlash
B. clearance
C. undercut
D. chordal thickness

64. What is the effect in bushing gears without backlash?
A. jamming
B. overheating
C. overload
D. all of these

65. What is the range of helix angle on helical gears?
A. less than 18
B. 15-25
C. 20-35
D. 35-40

66. What refers to the surface of the gear between the fillets of adjacent teeth?
A. top land
B. bottom land
C. pitch
D. fillet

67. What is a plane perpendicular to the axial plane and to the pitch plane, coinciding in gears with parallel axes?
A. transverse plane
B. principal reference plane
C. normal plane
D. pitch plane

68. What is used to change rotary motion to reciprocating motion?
A. Helical gear
B. Rack gear
C. Worm gear
D. Spur gear

69. What type of gear is used to transmit power at high velocity ratios between non-intersecting shafts, usually at right angles?
A. helical gear
B. bevel gear
C. worm gear
D. spiral gear

70. For evenly distributed and uniform wear on each meshing gear tooth, what is the ideal design practice?
A. wear resistance alloy addition to tooth gear
B. heat treatment of the gears
C. hardening of each tooth
D. hunting tooth addition

71. In involute teeth, the pressure angle is often defined as the angle between the line of action and the line of tangent to the pitch circle. It is also termed as?
A. helix angle
B. angle of recess
C. angle of obliquity
D. arc of action

72. What is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles?
A. backlash
B. clearance
C. undercut
D. chordal thickness

73. What accounts for the backlash of spur gears?
A. Both module and pitch line velocity
B. Pitch line velocity
C. Module
D. Tooth profile

74. Which type of gears are used for shaft axes have an offset?
A. Hypoid gear
B. Zero gear
C. Spiral Bevel gear
D. Mitre gear

75. What is the angle, at the base cylinder of an involute gear, that the tooth makes with the gear axis called?
A. base helix angle
B. pressure angle
C. arc of recess
D. arc of approach

76. What is the path of contact involute gears where the force/power is actually transmitted?
A. principal reference plane
B. pitch point
C. front angle
D. line of action

77. What is the arbitrary modification by removing a small portion of a tooth material at the tip of the gear tooth called?
A. tip removal
B. tip undercut
C. tip relief
D. pressure angle cut

78. What is the concave portion of the tooth profile where it joins the bottom of the tooth space?
A. fillet curve
B. fillet radius
C. bottom depth
D. fillet diameter

79. In gear design, what is the ratio of the pitch diameter in inches to the number of teeth called?
A. module
B. diametral pitch
C. English module
D. circular pitch

80. What is the effective face width of a helical gear divided by the axial pitch, sometimes called face overlap?
A. Angle overlap
B. Axial overlap
C. Contact overlap
D. Helical overlap

81. What curve is formed by the path of a point on a straight line as it rolls along a convex base curve, usually used as the profile of gear tooth?
A. axial plane
B. arc of recess
C. involute
D. arc of action

82. What is a plane perpendicular to the axial plane and to the pitch plane, coinciding in gears with parallel axes?
A. tangent plane
B. transverse
C. straight plane
D. reference plane

83. Which of the following is a single measure that combines the external dynamic load of an application with a gear drive's reliability and operating life?
A. ratio factor
B. reliability factor
C. service factor
D. life factor

84. How do you call the circle bounding the bottom of the teeth?
A. addendum circle
B. addendum cylinder
C. pitch circle
D. dedendum circle

85. What is the difference between the width of a tooth space and the thickness of the engaging tooth on the pitch circles?
A. backlash
B. clearance
C. undercut
D. chordal thickness

86. What will be the effect in bushing gears without backlash?
A. jamming
B. overheating
C. overload
D. all of these

87. What is the range of helix angle on helical gears?
A. less than 18
B. 15-25
C. 20-35
D. 35-40

88. What refers to the surface of the gear between the fillets of adjacent teeth?
A. top land
B. bottom land
C. pitch
D. fillet

89. What is a plane perpendicular to the axial plane and to the pitch plane, coinciding in gears with parallel axes?
A. transverse plane
B. principal reference plane
C. normal plane
D. pitch plane

90. What is used to change rotary motion to reciprocating motion?
A. Helical gear
B. Rack gear
C. Worm gear
D. Spur gear

91. What type of gear is used to transmit power at high velocity ratios between non-intersecting shafts, usually at right angles?
A. helical gear
B. bevel gear
C. worm gear
D. spiral gear

92. For evenly distributed and uniform wear on each meshing gear tooth, what is the ideal design practice?
A. wear resistance alloy addition to tooth gear
B. heat treatment of the gears
C. hardening of each tooth
D. hunting tooth addition

93. In involute teeth, the pressure angle is often defined as the angle between the line of action and the line of tangent to the pitch circle. It is also termed as?
A. helix angle
B. angle of recess
C. angle of obliquity
D. arc of action

94. What is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles?
A. backlash
B. clearance
C. undercut
D. chordal thickness

95. What accounts for the backlash of spur gears?
A. Both module and pitch line velocity
B. Pitch line velocity
C. Module
D. Tooth profile

96. Which type of gears are used for shaft axes have an offset?
A. Hypoid gear
B. Zero gear
C. Spiral Bevel gear
D. Mitre gear

97. What is the angle, at the base cylinder of an involute gear, that the tooth makes with the gear axis called?
A. base helix angle
B. pressure angle
C. arc of recess
D. arc of approach

98. The path of contact involute gears where the force/power is actually transmitted. It is a straight imaginary line passing through the pitch point and tangent to the base circle.
A. principal reference plane
B. pitch point
C. front angle
D. line of action

99. What is the arbitrary modification by removing a small portion of a tooth material at the tip of the gear tooth called?
A. tip removal
B. tip undercut
C. tip relief
D. pressure angle cut

100. What is the concave portion of the tooth profile where it joins the bottom of the tooth space?
A. fillet curve
B. fillet radius
C. bottom depth
D. fillet diameter