Theory of Machine
Kinematic pairs are those which have

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

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Theory of Machine
Which of the following is false statement in respect of differences between machine and structure?

Efficiency of machines as well as structures is below 100 %
Machines transmit mechanical work, whereas structures transmit forces
Machines modify movement and work, whereas structures modify forces
In machines, relative motion exists between its members, whereas same does not exist in case of structures

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