Theory of Machine
The example of successfully constrained motion is a

Piston reciprocating inside an engine cylinder
Motion of an I.C. engine valve
Motion of the shaft between a footstep bearing
All of these

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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 modify movement and work, whereas structures modify forces
Machines transmit mechanical work, whereas structures transmit forces
In machines, relative motion exists between its members, whereas same does not exist in case of structures

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