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Theory of Machine

Theory of Machine
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

180°
90°
360°
0°

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Theory of Machine
The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is

30195
9/128
44082
44090

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Theory of Machine
An exact straight line motion mechanism is a

Scott-Russell's mechanism
Hart's mechanism
All of these
Peaucellier's mechanism

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

95 mm
Slightly more than 45 mm
Slightly less than 45 mm
45 mm

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Theory of Machine
If the opposite links of a four bar linkage are equal, the links will always form a

Parallelogram
Pentagon
Rectangle
Triangle

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Theory of Machine
In a pantograph, all the pairs are

Self-closed pairs
Spherical pairs
Sliding pairs
Turning pairs

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