Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.

Complex conjugate
None of these
Equal
Real

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Theory of Machine
In a four bar chain or quadric cycle chain

Three are turning pairs and one is a sliding pair
One is a turning pair and three are sliding pairs
Two are turning pairs and two are sliding pairs
Each of the four pairs is a turning pair

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