Which of the statement is incorrect?
1
Grashof’s rule states that for a planar crank-rocker four bar mechanism, the sum of the shortest and longest link lengths cannot be less than the sum of the remaining two link lengths
2
Inversions of a mechanism are created by fixing different links one at a time.
3
Geneva mechanism is an intermittent motion device
4
Gruebler’s criterion assumes mobility of a planar mechanism to be one.