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Theory of Machine

Theory of Machine
In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is

180°
90°
0°
270°

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Theory of Machine
When one of the links of a kinematic chain is fixed, the chain is known as a

Inversion
Structure
Machine
Mechanism

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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)

¾μWR
½μWR
²/₃ μWR
μwr

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Theory of Machine
In a flat collar pivot bearing, the moment due to friction is proportional to

(r₁³ - r₂³)/(r₁ - r₂)
(r₁² - r₂²)/(r₁ + r₂)
(r₁³ - r₂³)/(r₁² - r₂²)
(r₁² - r₂²)/(r₁ - r₂)

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Theory of Machine
Oldham’s coupling is an inversion of the kinematic chain used in

Whitworth quick return mechanism
Elliptical trammels
Universal joint
Rotary engine

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

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

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