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THEORY OF MACHINE

Theory of Machine
When a slider moves on a fixed link having curved surface, their instantaneous centre lies

At the centre of curvature
At the pin joint
At the centre of circle
On their point of contact

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Theory of Machine
The total number of instantaneous centers for a mechanism consisting of n links are

n - 1
n/2
n(n - 1)/2
n

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Theory of Machine
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

P = W cos(α + φ)
P = W tan(α + φ)
P = W tan(α - φ)
P = W tan(φ - α)

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Theory of Machine
A body will begin to move down an inclined plane, if the angle of inclination of the plane is ________ the angle of friction.

Greater than
Less than
None of these
Equal to

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)

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

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