Correct option is C
In a gear system:
1.
Dedendum: The distance from the
pitch circle to the
bottom of the tooth space. This is the portion of the tooth that extends below the pitch circle towards the gear root.
2.
Addendum: The distance from the
pitch circle to the
top of the tooth.
Key Definitions:
Pitch Circle: The imaginary circle that represents the size and contact point of the gear teeth during meshing.
Tooth Space: The gap between two consecutive gear teeth.
The standard value of the dedendum is 1.157 times the module of the gear.
Addendum:
The standard value of the addendum is one module.
