Which of the following is FALSE?

A

A reverted gear train is one in which the first and last gears are on the same axis.

B

Train value for a gear is the ratio of productof driven tooth numbers to product of driving tooth numbers.

C

A planetary gear train is one in which the axes of some of the gears may have a motion.

D

A compound geartrain is one which has two or more gears on each axis.