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Theory of Machine

Theory of Machine
If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to

l + 1
l
l - 1
l - 2

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)

(3/4) μ W R cosecα
μ W R cosecα
(2/3) μ W R cosecα
(1/2) μ W R cosecα

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Theory of Machine
The cam and follower is an example of

Rolling pair
Sliding pair
Higher pair
Lower pair

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is(Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

²/₃ μWR
¾μWR
μwr
½μWR

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Theory of Machine
In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

log(x₁.x₂)
loge(x₁/x₂)
x₁/x₂
log(x₁/x₂)

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Theory of Machine
The number of centers in a crank driven slider crank mechanism is

6
2
4

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