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Theory of Machine

Theory of Machine
If there are L number of links in a mechanism, then number of possible inversions is equal to

L
L - 1
L + 1
L + 2

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Theory of Machine
The angle of inclination of the plane, at which the body begins to move down the plane is called

None of these
Angle of projection
Angle of friction
Angle of repose

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Theory of Machine
In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

ω sinθ/(n² - cos²θ)1/2
ω cosθ/(n² - cos²θ)1/2
ω cosθ/(n² - sin²θ)1/2
ω sinθ/(n² - sin²θ)1/2

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Theory of Machine
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to

-1
2
1

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Theory of Machine
The Coriolis component of acceleration depends upon

Both (A) and (B)
Angular velocity of the link
None of these
Velocity of slider

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Theory of Machine
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

α = 90° - φ
α = 45° - φ/2
α = 45° + φ/2
α = 90° + φ

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