Sliding pairs
Rolling pairs
Higher pairs
Turning pairs

Rolling pair
Lower pair
Sliding pair
Higher pair

## Theory of Machine Which of the following mechanism is an approximate straight line motion mechanism?

Watt's mechanism
Grasshopper mechanism
All of these
Robert's mechanism

## Theory of Machine The dynamic friction is the friction experienced by a body, when the body

Just begins to slide over the surface of the other body
Is in motion
Is at rest
None of these

## Theory of Machine Which one of the following can completely balance several masses revolving in different planes on a shaft?

Two masses in any two planes
A single mass in different planes
Two equal masses in any two planes
A single mass in one of the planes of the revolving masses

## Theory of Machine The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by

ω². (r₁ - r₂). (1 - sin² θ)
ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]
ω². (r₁ + r₂). (1 + cos² θ)
ω². (r₁ r₂). (1 - cos² θ)