CPT Transmission & Drivetrain Systems 2

Question 1

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

Accepted Answer

Multiply engine torque and transfer power to the transmission

Answer

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

Question 2

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

Accepted Answer

Clutch packs and bands

Answer

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

Question 3

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

Accepted Answer

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

Answer

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

Question 4

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

Accepted Answer

Ring gear

Answer

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

Question 5

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

Accepted Answer

Acting as a mechanical friction coupling

Answer

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.

(CPT) Certified Process Technician Practice Test

(CPT) Certified Process Technician Practice Test

CPT Transmission & Drivetrain Systems 2