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Theory of Machine

Theory of Machine
If the opposite links of a four bar linkage are equal, the links will always form a

Parallelogram
Pentagon
Triangle
Rectangle

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

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Theory of Machine
The lower pair is a

Sliding pair
Closed pair
Open pair
Point contact pair

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Theory of Machine
The periodic time of one oscillation for a simple pendulum is

2π. √(g/l)
2π. √(l/g)
(1/2π). √(g/l)
(1/2π). √(l/g)

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Theory of Machine
The Klein's diagram is used when

Crank has nonuniform angular acceleration
Crank has uniform angular velocity
Crank has uniform angular acceleration
Crank has nonuniform angular velocity

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

95 mm
Slightly more than 45 mm
Slightly less than 45 mm
45 mm

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