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.

None of these
Real
Equal
Complex conjugate

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Theory of Machine
Open pairs are those which have

Point or line contact between the two elements when in motion
Two elements that permit relative motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically

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