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Machine Design > MD3 > Flashcards

MD3 Flashcards

1
Q
  1. Are bevel gears mounted on intersecting. shafts at angle of other than 90ᵒ.
    A. right angle gears
    B. half gears
    C. inclined gears
    D. angular gears
A

D

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2
Q
  1. Is one in which the pitch angle is 90ᵒ that is, the pitch cone has become a plane.
    A. spur gear
    B. crown gear
    C. worm gear
    D. worm wheel
A

B

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3
Q
  1. Is used to transmit power between nonintersecting shafts, nearly always at right angle to each other.
    A. Spur gear
    B. Ordinary gear
    C. Bevel gear
    D. Worm gear
A

D

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4
Q

The two types of construction for the worm are:
A. Shell and cylindrical
B. Shell and zigzag
C. Shell and integral
D. Tube and integral

A

C

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5
Q
  1. The standard pressure angle for fine pitch gears is ____ degrees and is recommended for most applications.
    A. 14.5ᵒ
    B. 21ᵒ
    C. 20ᵒ
    D. 16ᵒ
A

C

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6
Q
  1. The contact ratio of pair of mating spur gears must be well over____ to insure a smooth transfer of load from one pair of teeth to the next pair.
    A. 1.0
    B. 3.0
    C. 2.0
    D. 4.0
A

A

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7
Q
  1. As general rule contact ratio should not be less than about______.
    A. 1.1
    B. 1.3
    C. 1.2
    D. 1.4
A

D

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8
Q
  1. Surface roughness on active profile surface on gear is about ____ pitch.
    A. 30
    B. 34
    C. 32
    D. 36
A

C

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9
Q
  1. Tooth breakage on gear is usually a____,
    A. Tensile fatigue
    B. Contact stress
    C. A crack
    D. None of these
A

A

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10
Q

GMA means
A. American German Manufacturers Association
B. Athletic Gear Main Association
C. American Gear Metal Association
D. American Gear Manufacturers Association

A

D

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11
Q
  1. Which of the following does not belong to the group?
    A. Tooth scoring
    B. Tooth breakage
    C. Pitting
    D. Toughing
A

D

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12
Q
  1. Well-proportioned commercial gears with a pitch line velocity of less than_____ will normally not score if they have a reasonably good surface finish and are properly lubricated.
    A. 6000 fpm
    B. 7000 fpm
    C. 6500 fpm
    D. 8000 fpm
A

B

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13
Q
  1. Experimental data from actual gear unit measurements are selcom repeatable within a plus or minus____ band
    A. 5%
    B. 15%
    C. 10%
    D. 20%
A

C

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14
Q
  1. Pitting is a function of the Hertzian contract stresses between two cylinders and is proportional to the square root of the ______.
    A. applied load
    B. the contact stress
    C. the stress
    D. impact
A

A

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15
Q
  1. When an excitation frequency coincides with a natural frequency.
    A. unity
    B. resonance
    C. obliquity
    D. sinusoidal
A

B

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16
Q
  1. The average tooth stiffness constant of face is usually
    A. 1.5 to 2 psi
    B. 5 to 6 psi
    C. 3 to 4 psi
    D. 7.5 to 10 psi
A

A

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17
Q
  1. Cast iron shall not be used over
    A. 420ᵒF
    B. 430ᵒF
    C. 440ᵒF
    D. 450ᵒF
A

D

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18
Q
  1. When the number of teeth in a pair of meshing gears are such that they do not have a common divisor.
    A. dummy
    B. LCD
    C. addit
    D. hunting
A

D

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19
Q
  1. For internal gears having a 20ᵒ pressure angle and full depth teeth, the difference between the number of teeth in a gear and pinion should not less than ____.
    A. 10
    B. 14
    C. 12
    D. 16
A

C

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20
Q
  1. Zero bevel gears of 20 degrees angle should have a pinion either no less than____.
    A. 15 teeth
    B. 17 teeth
    C. 16 teeth
    D. 18 teeth
A

B

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21
Q

21._____ are machine elements thar transmit motion by means of successively engaging teeth.
A. shaft
B. sprocket
C. spline
D. gear

A

D

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22
Q
  1. Height of tooth above pitch circle or the distance between the pitch circle and the top of the tooth.
    A. addendum
    B. dedendum
    C. total depth
    D. tooth depth
A

A

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23
Q
  1. The circle that bounds the outer ends of the teeth.
    A. root circle
    B. pitch circle
    C. addendum circle
    D. dedendum circle
A

C

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24
Q
  1. Arc of the pitch circle through which a tooth travels from the first point of contact with the mating tooth to the pitch point.
    A. line of action
    B. arc of action
    C. arc of action
    D. pitch arc
A

B

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25
Q
  1. Is the angle through which the gear turns from the time a given pair of teeth are in contact at the pitch point until they pass out the mesh.
    A. angle of contact
    B. angle of approach
    C. position angle
    D. angle of recess
A

D

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26
Q
  1. Is the angle through which the gear turns from the time a particular pair of teeth come into contact until they go out the contact.
    A. pitch angle
    B. angle of action
    C. angle of approach
    D. none of these
A

B

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27
Q
  1. Is the angle through which the gear turns form the time a particular pair of teeth come into contact until they are in contact at the pitch point.
    A. angle approach
    B. angle of recess
    C. angle of contact
    D. none of tangent
A

A

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28
Q
  1. Arc of the circle through which a tooth travels from the point of contact with the mating tooth to the pitch point
    A. angle of arc
    B. arch of contract
    C. arc of approach
    D. none of the above
A

C

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29
Q
  1. The ratio of the arc of approach to the arc of action.
    A. Ratio and proportion
    B. contract ratio
    C. approach ratio
    D. arc ratio
A

C

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30
Q
  1. In a pair of gears it is the plane that contains the two axes, in single gear, it may be any plane containing the axis and the given point.
    A. axial plane
    B. pitch plane
    C. surface plane
    D. bottom land
A

A

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31
Q
  1. Arc of the pitch circle through which a tooth travels from its contact with the mating tooth at the pitch point to the point where the contact ceases.
    A. arc of recess
    B. arc of approach
    C. arc of contact
    D. arc of intersection
A

A

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32
Q
  1. The amount by which the width of the tooth space exceeds the thickness of the engaging tooth on the pitch circles.
    A. clearance
    B. backlash
    C. difference
    D. tooth difference
A

B

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33
Q
  1. The circle from which an involute tooth is generated or developed.
    A. Pitch circle
    B. Contact circle
    C. addendum circle
    D. base circle
A

D

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34
Q
  1. The angle, at the base cylinder if an involute gear that the tooth makes with the gear axis.
    A. pitch angle
    B. approach angle
    C. helix angle
    D. none of these
A

C

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35
Q
  1. In an involute gear it is the pitch on the base circle or along the line of action.
    A. critical pitch
    B. helix pitch
    C. diametral pitch
    D. base pitch
A

D

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36
Q
  1. Is the base pitch in the normal plane.
    A. normal base pitch
    B. Tangential pitch
    C. total pitch
    D. intersecting pitch
A

A

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37
Q
  1. Is the base pitch in the axial plane.
    A. axial base pitch
    B. cone pitch
    C. radial pitch
    D. linear pitch
A

A

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38
Q
  1. The distance between the parallel axes of sugar gears and parallel helical gears, or between the crossed axes of helical gears and worm gears.
    A. vertical distance
    B. horizontal distance
    C. displacement
    D. center distance
A

D

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39
Q
  1. In a woman gear this is a plane perpendicular to the gear axis and contains the common perpendicular of the gear and the woman axis.
    A. inner plane
    B. central plane
    C. pitch plane
    D. angular plane
A

B

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40
Q
  1. Length of the chord subtended by the circular thickness arc.
    A. chordal thickness
    B. tooth thickness
    C. space thickness
    D. flank thickness
A

A

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41
Q
  1. The height from the top of the tooth to the chord subtending the circular- thickness arc.
    A. addendum height
    B. tangential height
    C. chordal addendum
    D. addendum circle
A

C

42
Q
  1. Length of the arc of the pitch circle between the centers or other corresponding points of the adjacent teeth.
    A. pitch arc
    B. circular pitch
    C. circular arc
    D. contract arc
A

B

43
Q
  1. The smallest diameter on gear tooth with the which the mating gear makes contact.
    A. inside diameter
    B. outside diameter
    C. nominal diameter
    D. contact diameter
A

D

44
Q
  1. The maximum compressive stress within the contact area between mating gear tooth profiles.
    A. contact stress
    B. hoop stress
    C. bearing stress
    D. tangential stress
A

A

45
Q
  1. The lowest permissible water level shall be at a point ____ of the height of the shell.
    A. contact stress
    B. hoop stress
    C. bearing stress
    D. tangential stress
A

B

46
Q
  1. Is the circular pitch in the normal plane.
    A. Circular pitch
    B. diametral pitch
    C. pitch circle
    D. normal circular pitch
A

D

47
Q
  1. Also known as tooth thickness or the length of the arc between the two sides of a gear tooth, on the pitch circles unless otherwise specified.
    A. tooth thickness
    B. space thickness
    C. circular thickness
    D. clearance thickness
A

C

48
Q
  1. The amount by which the dedendum exceeds the addendum of the mating tooth
    A. difference
    B. clearance
    C. backlash
    D. none of these
A

B

49
Q
  1. The smallest diameter on gear tooth with which the mating gear makes.
    A. pitch diameter
    B. circular diameter
    C. tangential diameter
    D. central diameter
A

D

50
Q
  1. The ratio of the arc of action to the circular pitch.
    A. approach ratio
    B. conjugate ratio
    C. approach ratio
    D. contact ratio
A

D

51
Q
  1. Is the curve that satisfy the law of gearing.
    A. involute curve
    B. conjugate curve
    C. fillet curve
    D. bottom land curve
A

B

52
Q
  1. The curve formed by the path of a point on circle as it rolls along a straight line.
    A. epicycloid
    B. trochoid
    C. hypocycloid
    D. cycloid
A

D

53
Q
  1. The depth of tooth space below the pitch circle or the radial dimension between the pitch circle and the bottom of the tooth space.
    A. dedendum
    B. addendum
    C. total depth
    D. pitch depth
A

A

54
Q
  1. Is also known as root circle or is the circle that bounds the bottoms of the teeth.
    A. pitch circle
    B. addendum circle
    C. dedendum circle
    D. curve circle
A

C

55
Q
  1. The ratio of the number of teeth to the number of millimeters of pitch diameter.
    A. modula
    B. Circular pitch
    C. Diametral pitch
    D. None of the above
A

C

56
Q
  1. Is the diametral pitch calculated in the normal plane and is equal to the pitch divided by the cosine of helix angle
    A. tangential diametral pitch
    B. normal diametral pitch
    C. flank pitch
    D. none of these
A

B

57
Q
  1. That portion of the face width that actually comes into contact with mating teeth, as occasion one member of pair of gears may have a greater face width that the other.
    A. backlash
    B. top land
    C. pitch land
    D. effective face width
A

D

58
Q
  1. The actual torque ratio of a gear set divided by its gear ratio.
    A. ratio and portion
    B. contact ratio
    C. stress ratio
    D. efficiency
A

D

59
Q
  1. When it rolls along the outer side of another circle.
    A. helix
    B. involute
    C. cycloid
    D. epicycloid
A

D

60
Q
  1. A gear with teeth on the outer cylindrical surface.
    A. internal gear
    B. central gear
    C. external gear
    D. worm gear
A

C

61
Q
  1. That surface of the tooth which is between the pitch circle to the top of the tooth.
    A. bottom land
    B. top land
    C. face tooth
    D. surface tooth
A

C

62
Q
  1. The length of the teeth in axial plane.
    A. Tooth thickness
    B. clearance
    C. Face width
    D. Clearance
A

C

63
Q
  1. Is the surface of the tooth between the pitch cylinder and the addendum cylinder.
    A. surface
    B. face
    C. contact
    D. none of the above
A

B

64
Q
  1. The concave portion of the tooth profile where it joins the bottom of the tooth space. The approximate radius of this curve is called the fillet radius.
    A. fillet curve
    B. conjugate curve
    C. half curve
    D. none of the above
A

A

65
Q
  1. The maximum tensile stress in the gear tooth fillet.
    A. contact stress
    B. bearing stress
    C. hoop stress
    D. fillet stress
A

D

66
Q
  1. That surface which is between the pitch circle and the bottom land.
    A. flank
    B. surface finish
    C. flank of tooth
    D. none of these
A

C

67
Q
  1. Is the surface of the tooth between the pitch and root cylinders
    A. flank
    B. surface finish
    C. flank of tooth
    D. none of these
A

C

68
Q
  1. Is the number of teeth in the gear divided by the number of teeth in the pinion
    A. diametral pitch ratio
    B. tooth ratio
    C. gear ratio
    D. none of these
A

C

69
Q
  1. The angle that a helical gear tooth makes the gear axis.
    A. pitch angle
    B. worm angle
    C. helix angle
    D. none of the above
A

C

70
Q
  1. The effective face width a helical gear divided by the gear axial pitch.
    A. rivet overlap
    B. welded overlap
    C. helical overlap
    D. none of these
A

C

71
Q
  1. When it rolls along the inner side of another circle
    A. hypocycloid
    B. cycloid
    C. trochoid
    D. involute
A

A

72
Q
  1. The diameter of a circle coinciding with the tops of the teeth on an internal gear
    A. internal diameter
    B. external diameter
    C. pitch diameter
    D. none of these
A

A

73
Q
  1. A gear with teeth on the inner cylindrical surface.
    A. internal diameter
    B. external diameter
    C. pitch diameter
    D. none of these
A

A

74
Q
  1. The curve formed by the path of point on a straight line, called the generatrix, as it rolls along a convex base curve.
    A. helix
    B. involute
    C. trochoid
    D. pitch
A

B

75
Q
  1. Is the top surface of the tooth
    A. top land
    B. bottom land
    C. surface land
    D. island
A

A

76
Q
  1. Is the surface of the gear between the fillets of adjacent teeth.
    A. top land
    B. common land
    C. stress land
    D. bottom land
A

D

77
Q
  1. The distance a helical or worm would threated along its axis one revolution of it were free to move axially.
    A. pitch
    B. lead
    C. speed
    D. none of these
A

B

78
Q
  1. The path of contact in involute gears. It is a straight line passing through the pitch point and the tangent to the base circles.
    A. contact action
    B. line action
    C. approach action
    D. approach contact
A

B

79
Q
  1. The distance on an involute line of action through which the point of contact moves during the action of the tooth profile.
    A. distance of action
    B. length of action
    C. line action
    D. approach contact
A

B

80
Q
  1. Is the ratio of pitch diameter in millimeter to the number of teeth, mm.
    A. diametral pitch
    B. module
    C. circular pitch
    D. none of these
A

B

81
Q
  1. A plane normal to the tooth surfaces at a point of contact, and perpendicular to the pitch plane.
    A. normal plane
    B. pitch plane
    C. x and y plane
    D. tangential plane
A

A

82
Q
  1. The diameter of the outside circle.
    A. pitch diameter
    B. inside diameter
    C. inner diameter
    D. outside diameter
A

D

83
Q
  1. The distance between similar, equally spaced tooth surfaces, in a given direction and along a given curve or line.
    A. axial
    B. arc
    C. lead
    D. pitch
A

D

84
Q
  1. Is the angle subtended by the arc on the pitch circle equal in the length to the circular pitch.
    A. helix angle
    B. contact angle
    C. pitch angle
    D. cone angle
A

C

85
Q
  1. The diameter of the pitch circle.
    A. addendum diameter
    B. dedendum diameter
    C. stress area diameter
    D. pitch diameter
A

D

86
Q
  1. A circle the radius of which is equal to the distance from the gear axis to the pitch point
    A. addendum circle
    B. dedendum circle
    C. root circle
    D. pitch circle
A

D

87
Q
  1. Of meshing gears is the point of tangency of the pitch circle.
    A. conjugate point
    B. pitch point
    C. west point
    D. none of these
A

B

88
Q
  1. In a pair of gears it is the plane perpendicular to the axial plane and tangent to the pitch surfaces.
    A. addendum plane
    B. pitch plane
    C. surface
    D. none of these
A

B

89
Q
  1. Any plane perpendicular to gear axis.
    A. plane of rotation
    B. axial plane
    C. tangential plane
    D. none of these
A

A

90
Q
  1. The angle between the tooth profile and a radical line at its pitch point. In involute teeth, the angle between the line of action and the line tangent to the pitch circle.
    A. pitch angle
    B. pressure angle
    C. contact angle
    D. helix angle
A

B

91
Q
  1. These are the pitch plane, axial plane, and traverse plane, all intersecting at a point and mutually perpendicular.
    A. Reference plane
    B. Pitch plane
    C. Principal reference plane
    D. contrast
A

C

92
Q
  1. A gear with teeth spaced along a straight line, and suitable for straight line motion.
    A. rock
    B. rack
    C. space width
    D. none of these
A

B

93
Q
  1. The angle subtended at the center of the base circle from teeth origin of an involute to the point of tangency of the generatrix from any point on the same involute.
    A. pitch angle
    B. helix pitch
    C. control angle
    D. roll angle
A

D

94
Q
  1. A circle coinciding with or tangent to the bottoms of the tooth spaces.
    A. minimum circle
    B. root circle
    C. outside circle
    D. none of these
A

B

95
Q
  1. A plane tangent to the surfaces at a point or line of contract.
    A. tangent plane
    B. normal plane
    C. control plane
    D. none of these
A

A

96
Q
  1. An arbitrary modification of a tooth profile whereby a small amount of material is removed near the tip of the gear tooth.
    A. tip
    B. relief
    C. tip relief
    D. undercut
A

C

97
Q
  1. The width of tooth measured along the pitch circle.
    A. tooth thickness
    B. space thickness
    C. chordal thickness
    D. none of these
A

A

98
Q
  1. The space between the teeth measured along the pitch circle.
    A. three dimensional space
    B. contact space
    C. free space
    D. tooth space
A

D

99
Q
  1. The actual width dimensions of gear blank.
    A. difference face width
    B. total face width
    C. face width
    D. none of these
A

B

100
Q
  1. Is the radial distance from the addendum circle to the working depth circle.
    A. whole depth
    B. addendum depth
    C. working depth
    D. none of these
A

C

Machine Design (1 decks)

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