Theory of Machine
In involute gears, the pressure angle is

Always variable
Dependent on the size of gears
Always constant
Dependent on the size of teeth

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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 force is equal to zero
Resultant couple is equal to zero

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