Which statements about automatic transmissions are correct?

Which statements about automatic transmissions are correct?

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

Answer: (C)

Automatic transmissions shift gears automatically using a combination of planetary gear sets, a torque converter, and a hydraulic (often electronically assisted) control system. The torque converter provides fluid coupling between the engine and the transmission, allowing smooth engagement and some slip without a clutch pedal. The actual gear shifts are controlled by the valve body, which modulates hydraulic pressure to change gears, and in modern units, by an electronic control unit that reads speed, load, and other sensors to decide when to shift. If both technicians described accurate aspects of automatic transmissions, then both statements are correct. One might emphasize how the torque converter enables smooth starts and drive power transfer, while the other might highlight how the shift points are determined by hydraulic and electronic control. Together, they reflect two true facets of how automatics operate, which is why the option indicating both statements are correct best fits. In practice, this also aligns with why maintenance focuses on proper transmission fluid—its lubrication, cooling, and ability to transmit hydraulic pressure—along with following manufacturer-recommended fluid type and service intervals.

Automatic transmissions shift gears automatically using a combination of planetary gear sets, a torque converter, and a hydraulic (often electronically assisted) control system. The torque converter provides fluid coupling between the engine and the transmission, allowing smooth engagement and some slip without a clutch pedal. The actual gear shifts are controlled by the valve body, which modulates hydraulic pressure to change gears, and in modern units, by an electronic control unit that reads speed, load, and other sensors to decide when to shift.

If both technicians described accurate aspects of automatic transmissions, then both statements are correct. One might emphasize how the torque converter enables smooth starts and drive power transfer, while the other might highlight how the shift points are determined by hydraulic and electronic control. Together, they reflect two true facets of how automatics operate, which is why the option indicating both statements are correct best fits. In practice, this also aligns with why maintenance focuses on proper transmission fluid—its lubrication, cooling, and ability to transmit hydraulic pressure—along with following manufacturer-recommended fluid type and service intervals.