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Theory of Machine

Theory of Machine
The lower pair is a

Closed pair
Sliding pair
Open pair
Point contact pair

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Theory of Machine
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

P = W cos(α + φ)
P = W tan(α - φ)
P = W tan(α + φ)
P = W tan(φ - α)

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Theory of Machine
For a kinematic chain to be considered as mechanism

One link should be fixed
There is no such criterion
None of the links should be fixed
Two links should be fixed

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Theory of Machine
In automobiles the power is transmitted from gear box to differential through

Hooke's joint
Knuckle joint
Universal joint
Bevel gear

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Theory of Machine
Coriolis component is encountered in

Quick return mechanism of shaper
Both (A) and (C) above
Four bar chain mechanism
Slider crank mechanism

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

r cosφ
r sinφ
(r/2) cosφ
r tanφ

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