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Theory of Machine

Theory of Machine
A Porter governor is a

Inertia governor
Pendulum type governor
Spring loaded governor
Dead weight governor

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

ω₁.ω₂.r
(ω₁ + ω₂)r
(ω₁ - ω₂)r
(ω₁ - ω₂)2r

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Theory of Machine
The frequency of oscillation of a compound pendulum is

2π. √[(kG² + h²)/gh]
(1/2π). √[gh/(kG² + h²)]
(1/2π). √[(kG² + h²)/gh]
2π. √[gh/(kG² + h²)]

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Theory of Machine
The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is

Along PO
Perpendicular to PO
None of the listed here
At 45° to PO

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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
²/₃ μWR
½μWR
μwr

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Theory of Machine
The gear train usually employed in clocks is a

Simple gear train
Differential gear
Reverted gear train
Sun and planet gear

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