Machine Kinematics

Comparison Between Involute and Cycloidal Gears

Question 1
Marks : +2 | -2
Pass Ratio : 100%
In a gear having involute teeth, the normal to the involute is a tangent to the
pitch circle
base circle
addendum circle
dedendum circle
Explanation:
Addendum circle is the circle drawn through the top of the teeth and is concentric with the pitch circle.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following statement is correct for gears?
The addendum is less than the dedendum
The pitch circle diameter is the product of module and number of teeth
The contact ratio means the number of pairs of teeth in contact
All of the mentioned
Explanation:
None
Question 3
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Pass Ratio : 100%
For an involute gear, the ratio of base circle radius and pitch circle radius is equal to
sinɸ
cosɸ
secɸ
cosecɸ
Explanation:
None
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The contact ratio is given by
Length of the path of approach/Circular pitch
Length of the path of recess/Circular pitch
Length of the arc of contact/Circular pitch
Length of the arc of approach/cosɸ
Explanation:
None
Question 5
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Pass Ratio : 100%
The velocity of sliding _____________ the distance of the point of contact from the pitch point.
is directly proportional to
is inversaly proportional to
is equal to cosɸ multiplied by
does not depend upon
Explanation:
The velocity of sliding is the velocity of one tooth relative to its mating tooth along the common tangent at the point of contact.
Question 6
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The pressure angle for involute gears depends upon the size of teeth.
True
False
Explanation:
In a gear drive, the shape of the tooth depends upon the pressure angle.
Question 7
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In involute gears, the pressure angle is
dependent on the size of teeth
dependent on the size of gears
always constant
always variable
Explanation:
None
Question 8
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The centre distance between two meshing involute gears is equal to
sum of base circle radii/cosɸ
difference of base circle radii/cosɸ
sum of pitch circle radii/cosɸ
difference of pitch circle radii/cosɸ
Explanation:
None
Question 9
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Pass Ratio : 100%
In full depth 140 involute system, the smallest number of teeth in a pinion which meshes with rack without interference is
12
16
25
32
Explanation:
The minimum number of teeth on the pinion in order to avoid interference for 14.50 full depth involute are 32 and for 200 full depth involute teeth are 18.
Question 10
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Pass Ratio : 100%
When the tip of a tooth undercuts the root on its mating gear, it is known as interference.
True
False
Explanation:
None