## Theory of Machine When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r² + R²) cosφ]/2
[(r² + R²) sinφ]/2
[(r + R) cosφ]/2
[(r + R) sinφ]/2

## Theory of Machine The sense of Coriolis component is such that it

Leads the sliding velocity vector by 90°
Lags the sliding velocity vector by 90°
Leads the sliding velocity vector by 180°
Is along the sliding velocity vector

## Theory of Machine The example of lower pair is

All of these
Shaft revolving in a bearing
Straight line motion mechanisms
Automobile steering gear

## Theory of Machine Power of a governor is the

Mean force exerted at the sleeve for maximum equilibrium speed
Mean force exerted at the sleeve for a given percentage change of speed
None of these
Work-done at the sleeve for maximum equilibrium speed

One
Two
Six
Four

n₁ + n₂ - 2
n₁ + n₂ + 1
n₁ + n₂ - 1
n₁ + n₂