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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 - 1
l - 2
l
l + 1

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Theory of Machine
The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)

tanα = c/2b
cotα = c/2b
cosα = c/b
sinα = b/c

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Theory of Machine
________ is an inversion of Double slider crank chain.

Scotch yoke mechanism
Hand pump
Coupling rod of a locomotive
Reciprocating engine

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Theory of Machine
A foot step bearing and rotor of a vertical turbine form examples of

Completely constrained motion
Incompletely constrained motion
Successfully constrained motion
Partially constrained motion

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Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.22 mm
3.0 mm
2 mm
2.50 mm

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Theory of Machine
The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove)

sinβ
cosecβ
cosβ
secβ

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