Theory of Machine
In involute gears, the pressure angle is

Always variable
Dependent on the size of teeth
Always constant
Dependent on the size of gears

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is independent of me area of contact.
All of these
The friction force is dependent on the materials of the contact surfaces.
The friction force is directly proportional to the normal force.

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