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Theory of Machine

Theory of Machine
The flank of the tooth is the surface of the tooth __________ the pitch surface.

None of these
Below
Above
At

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

r cosφ
r sinφ
(r/2) cosφ
r tanφ

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

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Theory of Machine
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

ω² × OQ sinθ
ω² × OQ cosθ
ω² × OQ
ω² × OQ tanθ

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Theory of Machine
The motion of a shaft in a circular hole is an example of

Completely constrained motion
None of these
Incompletely constrained motion
Successfully constrained motion

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Theory of Machine
The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.

None of these
Minimum
Maximum
Zero

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