Theory of Machine
The inversion of a mechanism is

Obtained by fixing different links in a kinematic chain
Obtained by reversing the input and output motion
Turning its upside down
Changing of a higher pair to a lower pair

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Theory of Machine
The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)

(1/2). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
(2/3). μ W (r₁ + r₂)
(1/2). μ W (r₁ + r₂)
(2/3). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

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

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