Theory of Machine
The inversion of a mechanism is

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

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Two lower pairs and two additional links
Two lower pairs and one additional link
One lower pair and two additional links
Any one of these

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

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Theory of Machine
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is

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

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