Exam 127: Automatic Transmissiontransaxle Principles

Two technicians are discussing automatic transmissions/transaxles. Technician A says that it is normal for a vehicle to move slightly when the gear selector is in the "drive" position with the brakes released. Technician B says that the stator may be defective if the vehicle moves while in gear when the engine is at idle speed. Which technician is correct?

Technician A says that a five-speed automatic transmission will often use a compound planetary gear set. Technician B says that the torque converter clutch is often pulsed on and off to provide smooth engagement. Which technician is correct?

Technician A says the torque converter pump is attached to the engine and turns as the engine rotates. Technician B says the turbine is attached to the engine and turns as the engine rotates. Which technician is correct?

Technician A says that converter speed ratio is a measure of coupling efficiency. Technician B says that converter speed ratio is calculated by dividing the speed of the turbine rotation by the speed of the pump rotation. Which technician is correct?

Technician A says that when an automatic transmission/transaxle shifts into overdrive, the output shaft is rotating faster (higher RPM) than the engine crankshaft. Technician B says that an overdrive ratio is a ratio where the first number is less than 1. Which technician is correct?

Technician A says the gears in a planetary gearset are in constant mesh. Technician B says a planetary gearset has a ring gear and pinion gears. Which technician is correct?

During which conditions is the torque converter clutch engaged?

Technician A says that one planetary gear set can provide gear reduction, overdrive, and reverse. Technician B says that most transmissions today use compound (multiple) planetary gear sets. Which technician is correct?

How much is engine torque increased or multiplied when a typical torque converter is at stall speed?

Even the most efficient torque converter has a slippage rate of ________.

Technician A says the gear reduction occurs when the drive gear turns faster than the driven gear. Technician B says that overdrive occurs when the driven gear turns faster than the drive gear. Which technician is correct?

Using a torque converter smaller than stock size could result in ________.

The torque converter clutch increases efficiency by ________.

Which compound gearset uses a planetary gearset in front of a Ravigneaux gearset?

Which compound planetary gearset is commonly used in six speed transmissions?

Technician A says that a held member is also called the reaction member. Technician B says that if any two elements are locked together then the output will be 1:1. Which technician is correct?

One clutch in a dual clutch transmission is used for 1st, 2nd, and 3rd gears.

Technician A says the torque multiplication phase can occur when the stator one-way clutch begins to freewheel. Technician B says the torque multiplication phase can occur when the stator one-way clutch locks up. Which technician is correct?

Torque converters use a stator as a ________.

Technician A says automatic transmissions can shift gears without requiring an interruption of powerflow. Technician B says automatic transmissions use synchronizers instead of planetary gearsets. Which technician is correct?