Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Body contact
None of these
Line or point contact
Surface contact

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

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