engineering recuitment HPCL Junior Executive 2025 Mock Test Theory of Machines Gear Trains

Which of the following is NOT true about Planetary gear trains?

1
They are a one-degree-of-freedom systems.
2
They are a two-degree-of-freedom systems.
3
They have a moving axis or axes.
4
They have one or more gears orbiting about the central axis of the train.
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