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
Complex conjugate
Equal

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

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Theory of Machine
The inversion of a mechanism is

Obtained by reversing the input and output motion
Changing of a higher pair to a lower pair
Obtained by fixing different links in a kinematic chain
Turning its upside down

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