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Theory of Machine

Theory of Machine
A ball and a socket forms a

Turning pair
Rolling pair
Screw pair
Spherical pair

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Theory of Machine
If two moving elements have surface contact in motion, such pair is known as

Higher pair
Surface pair
Sliding pair
Rolling pair

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Theory of Machine
In a rigid link OA, velocity of 'A' w.r.t. 'O' will be

Perpendicular to OA
At 45° to OA
Along AO
Parallel to OA

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

None of these
Halved
Doubled
Quadrupled

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Theory of Machine
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is

18.52 N-s/m
1.4 N-s/m
52.92 N-s/m
529.2 N-s/m

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Theory of Machine
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

Greater than unity
Zero
Less than unity
Equal to unity

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