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Theory of Machine

Theory of Machine
The lower pairs are _________ pairs.

None of these
Self-closed
Force-closed
Friction closed

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Theory of Machine
When a point at the end of a link moves with constant angular velocity, its acceleration will have

Radial and tangential components both
Coriolis component only
Tangential component only
Radial component only

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Theory of Machine
According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on A. A triangle

Two lines
A point
A triangle
A straight line

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Theory of Machine
In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)

(r₁ + r₂) (y/x)
(r₁ - r₂) (y/x)
(r₁ - r₂) (x/y)
(r₁ + r₂) (x/y)

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

(3/4) μ W R
μ W R
(2/3) μ W R
(1/2) μ W R

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Theory of Machine
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Second's pendulum
Torsional pendulum
Compound pendulum
Simple pendulum

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