Theory of Machine
The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

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

Machines modify movement and work, whereas structures modify forces
Efficiency of machines as well as structures is below 100 %
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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