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Theory of Machine

Theory of Machine
The moment on the pulley which produces rotation is called

Torque
Momentum
Inertia
Moment of momentum

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Theory of Machine
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

l₂ = kG
l₁l₂ = kG
l₁l₂ = kG²
l₁ = kG

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

Universal joint
Rotary engine
Elliptical trammels
Whitworth quick return mechanism

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Theory of Machine
The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the center of gravity is equal to the radius of gyration of the body about its center of gravity.

Minimum
Zero
None of these
Maximum

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Theory of Machine
When the sleeve of a Porter governor moves downwards, the governor speed

Remain unaffected
Increases
Decreases
First increases and then decreases

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Theory of Machine
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

Less than unity
Greater than unity
Equal to unity
Zero

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