In the six-speed World Transmission, the three planetary gear sets are named P-1, P-2, and P-3. Which technician is correct?

In the six-speed World Transmission, the three planetary gear sets are named P-1, P-2, and P-3. Which technician is correct?

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

Answer: (A)

In a six-speed World Transmission, the gear ratios come from combining three planetary gear sets. Each set—P-1, P-2, and P-3—exists and can be engaged or held in different ways by the clutch packs to produce a particular gear. The six forward speeds are achieved by selecting which elements of these planetaries are driven or held, and by how the sets interact with each other through the transmission’s clutches. Technician A is correct because their statement aligns with the standard arrangement: there are three planetary gear sets labeled P-1, P-2, and P-3, and the gear choices come from how these three sets are engaged together. Technician B would be incorrect if it claims a different configuration—such as using fewer than three planetaries or mislabeling their roles—since the six speeds rely on the combined, specific engagement of all three sets.

In a six-speed World Transmission, the gear ratios come from combining three planetary gear sets. Each set—P-1, P-2, and P-3—exists and can be engaged or held in different ways by the clutch packs to produce a particular gear. The six forward speeds are achieved by selecting which elements of these planetaries are driven or held, and by how the sets interact with each other through the transmission’s clutches.

Technician A is correct because their statement aligns with the standard arrangement: there are three planetary gear sets labeled P-1, P-2, and P-3, and the gear choices come from how these three sets are engaged together. Technician B would be incorrect if it claims a different configuration—such as using fewer than three planetaries or mislabeling their roles—since the six speeds rely on the combined, specific engagement of all three sets.