A simple mechanism has :
1 link
2 link
3 link
4 link
4 link
●A mechanism with four links is known
as simple mechanism and the mechanism with more than four links is known as compound
mechanism.
●When all the links lie in the same
plane, it is known as planar mechanism and when all the links of mechanism lie
in different planes, it is known as spatial mechanism.
Hence, the correct option is (D).
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