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Theory of Machine

Theory of Machine
If there are L number of links in a mechanism, then number of possible inversions is equal to

L
L + 2
L + 1
L - 1

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Theory of Machine
Pulley in a belt drive acts as

Sliding pair
Cylindrical pair
Turning 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)

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

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Theory of Machine
In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

30°-40°
25°-30°
10°-15°
15°-25°

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Theory of Machine
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

Longitudinal vibrations
All of these
Torsional vibrations
Transverse vibrations

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Theory of Machine
Klein's construction gives a graphic construction for

Velocity polygon
Four bar chain mechanism
Slider-crank mechanism
Acceleration polygon

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