Theory of Machine
The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is

(kG² + h²)/h²
h/(kG² + h²)
h²/(kG² + h²)
(kG² + h²)/h

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Theory of Machine
Oldham's coupling is the

Second inversion of double slider crank chain
Third inversion of slider crank chain
Second inversion of single slider crank chain
Third inversion of double slider crank chain

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Theory of Machine
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

Oscillate with decreasing amplitude
Return to equilibrium position without oscillation
Oscillate with increasing time period
Oscillate with constant amplitude

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