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Transmission & Drivetrain Systems Flashcards

7 cards from real CPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Transmission & Drivetrain Systems flashcards as text

  1. What is the primary function of a torque converter in an automatic transmission?

    Answer: Multiply engine torque and transfer power to the transmission

    A torque converter uses fluid coupling to multiply engine torque at low speeds and transfer power smoothly to the automatic transmission.

  2. In an automatic transmission, what component is responsible for holding or releasing planetary gear set members to achieve different gear ratios?

    Answer: Clutch packs and bands

    Clutch packs and bands are hydraulically applied to hold or release specific planetary gear set members, producing different gear ratios.

  3. What is the purpose of the lock-up clutch inside a torque converter?

    Answer: Mechanically connect the pump and turbine to eliminate slip at cruising speed

    The lock-up clutch mechanically connects the converter pump to the turbine at cruising speeds, eliminating fluid slip and improving fuel efficiency.

  4. Which planetary gear set member, when held stationary, typically produces a reduction (lower) gear ratio?

    Answer: Ring gear

    Holding the ring gear stationary while driving the sun gear forces the planet carrier to turn at a reduced ratio, producing a gear reduction.

  5. Automatic Transmission Fluid (ATF) performs all of the following functions EXCEPT:

    Answer: Acting as a mechanical friction coupling

    ATF lubricates, transmits hydraulic pressure, and cools the transmission, but mechanical friction coupling is the role of clutch discs and bands, not the fluid itself.

  6. In a continuously variable transmission (CVT), what hardware physically varies the gear ratio?

    Answer: Variable-diameter pulleys and a drive belt or chain

    A CVT uses two variable-diameter pulleys connected by a steel belt or chain; changing the pulley diameters continuously varies the effective gear ratio.

  7. What causes transmission 'shudder' during torque converter lock-up engagement?

    Answer: Worn or contaminated lock-up clutch friction material

    Worn or ATF-contaminated lock-up clutch friction material causes inconsistent engagement, producing a shudder or vibration when the clutch applies.