Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Remain in the same place for all configurations of the mechanism
None of the listed here
Moves as the mechanism moves, but joints are of permanent nature
Vary with the configuration of the mechanism

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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?

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

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