## 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)

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

Any one of these

## Theory of Machine When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a

Flywheel
Governor
Meyer's expansion valve
D-slide valve

8
30
15
28

## Theory of Machine The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is

None of the listed here
Along PO
Perpendicular to PO
At 45° to PO

## Theory of Machine The factor which affects the critical speed of a shaft is

Span of shaft
Eccentricity
Diameter of disc
All of the listed here