Theory of Machine
Which of the following is an inversion of a double slider crank chain?

Oldham's coupling
Elliptical trammel
All of these
Scotch yoke mechanism

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force and resultant couple are both equal to zero
Resultant couple is equal to zero
Resultant force is equal to zero

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