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Theory of Machine

Theory of Machine
A pantograph is a mechanism with

Turning pairs
Rolling pairs
Higher pairs
Lower pairs

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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

360°
90°
0°
180°

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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

44082
44090
9/128
30195

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Theory of Machine
In order to double the period of a simple pendulum, the length of the string should be

Halved
Doubled
Quadrupled
None of these

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Theory of Machine
The relation between number of links (l) and number of joints (j) in a kinematic chain is

l = (1/2).(j + 2)
l = (2/3).(j + 2)
l = (3/4).(j + 3)
l = j + 4

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Theory of Machine
The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

Turning pair
Rolling pair
Sliding pair
Spherical pair

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