In the described range flows, Technician A says second range is a compound power flow involving the center and front planetary gear sets. Technician B says third and fourth ranges are simple planetary flows involving only the center planetary gear set. Who is correct?

In the described range flows, Technician A says second range is a compound power flow involving the center and front planetary gear sets. Technician B says third and fourth ranges are simple planetary flows involving only the center planetary gear set. Who is correct?

• A. Technician A
• B. Technician B
• C. Both Technician A and Technician B
• D. Neither Technician A nor Technician B

Answer: (C)

Power flow through planetary gears can be either simple or compound. A simple flow uses a single gear set in the path, with one element fixed or driven to produce the range ratio. A compound flow links two gear sets so power passes through both in sequence, giving a combined effect from both sets. In this scenario, the second range being a compound power flow means power goes through both the center and the front planetary gear sets in series, producing a combined gear ratio from those two sets. That makes Technician A correct. The third and fourth ranges, described as simple planetary flows involving only the center planetary gear set, mean the power path uses just that single gear set, with no other planetary set contributing in the path; that makes Technician B correct as well. Since both statements match the described arrangements, both technicians are correct.

Power flow through planetary gears can be either simple or compound. A simple flow uses a single gear set in the path, with one element fixed or driven to produce the range ratio. A compound flow links two gear sets so power passes through both in sequence, giving a combined effect from both sets.

In this scenario, the second range being a compound power flow means power goes through both the center and the front planetary gear sets in series, producing a combined gear ratio from those two sets. That makes Technician A correct. The third and fourth ranges, described as simple planetary flows involving only the center planetary gear set, mean the power path uses just that single gear set, with no other planetary set contributing in the path; that makes Technician B correct as well. Since both statements match the described arrangements, both technicians are correct.