Engineering :: Theory of Machines

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The difference between a machine and a structure is

[A].	The machine serves to modify and transmit forces only whereas structures serve to modify and transmit mechanical work	[B].	The machine serves to modify and transmit mechanical work whereas structures serve to modify and transmit forces only
[C].	The relative motion exists between the parts of a structures whereas it does not exist in machines	[D].	Structures are temporary constructions whereas machines are paramanent
[E].	None of the above

Answer: Option B