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Theory of Machine

Theory of Machine
The lower pairs are _________ pairs.

Self-closed
Friction closed
Force-closed
None of these

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

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

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

G.I₂
I₂/G²
I₂/G
G².I₂

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Theory of Machine
The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

Inclined at 45°
Opposite to each other
Perpendicular to each other
Parallel to each other

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Theory of Machine
A completely constrained motion can be transmitted with.

1 link with pin joints
3 links with pin joints
4 links with pin joints
2 links with pin joints

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0. If the roots of this equation are real, then the system will be

Critically damped
Under damped
Over-damped
Without vibrations

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