## Theory of Machine The example of successfully constrained motion is a

Piston reciprocating inside an engine cylinder
Motion of the shaft between a footstep bearing
Motion of an I.C. engine valve
All of these

## Theory of Machine The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r₁ = Minimum radius of the cam, r₂ = Radius of the roller follower, and θ = Angle turned by the cam from the beginning of the follower displacement)

(r₁ + r₂) [(1 - cosθ)/cosθ]
(r₁ + r₂) (1 + cosθ)
(r₁ - r₂) (1 - cosθ)
(r₁ - r₂) [(1 - cosθ)/cosθ]

## Theory of Machine It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by

Oldham's coupling
Flexible coupling
Knuckle joint
Universal joint

## Theory of Machine Which type of gearing is used in steering system of an automobile?

None of the listed here
Rack and pinion
Worm and wheel
Spiral gears

## Theory of Machine A Porter governor is a

Pendulum type governor
Inertia governor