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Theory of Machine

Theory of Machine
The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

None of these
Increases
Decreases
Remain same

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Theory of Machine
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r + R) cosφ]/2
[(r + R) sinφ]/2
[(r² + R²) cosφ]/2
[(r² + R²) sinφ]/2

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Theory of Machine
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ r₂) cosθ
ω (r₁ + r₂) sinθ sec2θ
ω (r₁ r₂) sinθ
ω (r₁ + r₂) cosθ cosec2θ

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Theory of Machine
A universal joint is an example of

Sliding pair
Lower pair
Rolling pair
Higher pair

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Theory of Machine
A mechanism is an assemblage of

Four or more than four links
All of these
Three links
Two links

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Theory of Machine
In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as

Logarithmic decrement
Damping factor
Magnification factor
Critical damping ratio

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