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Chapter 18
End of Chapter Review Questions Answer Key
1. Which of the following can be considered the largest gear in a simple planetary
gearset?
2. What results when any two members of a simple planetary gearset are locked together
to act as the input?
3. When the planetary carrier of a simple planetary gearset is the held member:
4. What results if a large external tooth gear is meshed with and driving a smaller
external tooth gear?
5. What is the function of multiple-disc clutches in a truck hydromechanical automatic
transmission?
6. In a close ratio transmission, all powerflows must pass through the __________
before reaching the output shaft.
7. What assists governor pressure in moving any shift signal shafts during an upshift?
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8. What component helps avoid shift shock by reducing pressure to the clutch apply
circuits during initial application and then gradually increasing the pressure?
9. Which type of hydraulic retarder is located between the torque converter and the
transmission gearing?
10. Which type of hydraulic retarder applies a friction clutch while the unit is charging
with hydraulic fluid?
11. Which of the following does the most to determine the position of the governor valve?
12. Which of the following does most to determine modulator pressure?
13. Which of the following devices has an operating principle similar to that of a
hydraulic retarder?
14. How many planetary gearsets are used in an Allison five-speed automatic
transmission?
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15. What regulates main pressure in an Allison automatic transmission?