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Theory of Machine

Theory of Machine
The cam and follower is an example of

Lower pair
Sliding pair
Higher pair
Rolling pair

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

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Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO. The acceleration of the piston P with respect to the crank-pin C is given by

ω² × CO
ω² × CN
ω² × NO
ω² × QN

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Theory of Machine
A system in dynamic balance implies that

There is no critical speed in the system
There will absolutely no wear of bearings
The system is also statically balanced
The system is critically damped

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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

Governor
D-slide valve
Flywheel
Meyer's expansion valve

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Theory of Machine
If two moving elements have surface contact in motion, such pair is known as

Surface pair
Sliding pair
Rolling pair
Higher pair

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