Below
None of these
At
Above

## 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 this equation are real, then the system will be

Without vibrations
Critically damped
Under damped
Over-damped

## Theory of Machine In a hydrodynamic journal bearing, there is

A thick film of lubricant between the journal and the bearing
A forced lubricant between the journal and the bearing
A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
No lubricant between the journal and the bearing

Belt and pulley
Screw pair
Turning pair
Sliding pair

## Theory of Machine In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

Equal to sum of other two
Less than sum of other two
There is no such relationship
Greater than sum of other two

## Theory of Machine The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be

0, and less than coV
0, and more than co2r
cor, 0
0, 0