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Theory of Machine

Theory of Machine
A ball and a socket forms a

Rolling pair
Screw pair
Turning pair
Spherical pair

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

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Theory of Machine
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

ω² r₁ sinθ
ω² (R - r₁) cosθ
ω² (R - r₁) sinθ
ω² R cosθ

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Theory of Machine
The frequency of oscillation at compared to earth will be

6 times less
6 times more
2.44 times less
2.44 times more

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Theory of Machine
In a simple train of wheels, the velocity ratio __________ the intermediate wheels.

Is independent of
Depends upon
None of these
Either A or B

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Theory of Machine
Which of the following has sliding motion?

Cross-head
Crank
Connecting rod
Crank pin

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