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
Complex conjugate
Equal
Real

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

The Ackerman steering gear consists of turning pairs
Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
Both (A) and (B)
The Ackerman steering gear is most economical

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