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Theory of Machine

Theory of Machine
If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to

l - 2
l - 1
l
l + 1

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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

Magnification factor
Critical damping ratio
Damping factor
Logarithmic decrement

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Theory of Machine
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is

Maximum and zero
Zero and maximum
Zero and minimum
Minimum and maximum

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Theory of Machine
Coriolis component is encountered in

Quick return mechanism of shaper
Four bar chain mechanism
Slider crank mechanism
Both (A) and (C) above

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Theory of Machine
In a flat collar pivot bearing, the moment due to friction is proportional to

(r₁² - r₂²)/(r₁ + r₂)
(r₁³ - r₂³)/(r₁² - r₂²)
(r₁² - r₂²)/(r₁ - r₂)
(r₁³ - r₂³)/(r₁ - r₂)

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Theory of Machine
In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

To start the locomotive quickly
Have perfect balancing
Minimize the effect of secondary forces
Minimize the effect of primary forces

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