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Theory of machines - Engineering

Q1:

Which of the following statement is correct?

A For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of gears.

B For involute gears, the pressure angle changes with the change in centre distance between gears.

C The epicyclic gear trains involve rotation of atleast one gear axis about some other gear axis.

D all of the above

ANS:D - all of the above

Explanation: No answer description is available.