Theory of Machine
A system in dynamic balance implies that

There will absolutely no wear of bearings
The system is also statically balanced
The system is critically damped
There is no critical speed in the system

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Theory of Machine
Which of the following statement is correct as regard to the difference between a machine and a structure?

All of these
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only

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Theory of Machine
Kinematic pairs are those which have

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

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