DTC DTC Drivetrain and Transmission Systems

Question 1

Which type of transmission is most commonly found in heavy-duty diesel trucks used in the US?

Accepted Answer

Automated manual transmission (AMT)

Answer

Continuously variable transmission (CVT)

Answer

Dual-clutch transmission (DCT)

Answer

Torque converter automatic

Question 2

What is the purpose of a transfer case in a diesel-powered 4WD vehicle?

Accepted Answer

To distribute power between front and rear axles

Answer

To increase engine torque output

Answer

To cool the transmission fluid

Answer

To synchronize driveshaft speeds

Question 3

When diagnosing a slipping diesel transmission, which fluid condition should be checked first?

Accepted Answer

Fluid color and odor

Answer

Fluid viscosity rating

Answer

Fluid freeze point

Answer

Fluid pH level

Question 4

What does the term 'clutch brake' refer to in a heavy-duty manual diesel drivetrain?

Accepted Answer

A device that stops the input shaft rotation to allow smooth gear engagement from neutral

Answer

A brake used to slow the truck when the clutch is engaged

Answer

A hydraulic brake booster activated during clutch pedal travel

Answer

An emergency braking system tied to the clutch pedal

Question 5

Which component connects the transmission output shaft to the drive axle in a typical heavy-duty diesel truck?

Accepted Answer

Driveshaft (propeller shaft)

Answer

Torque converter

Answer

Differential

Answer

Output flange only

Question 6

What symptom most commonly indicates a worn or damaged universal joint (U-joint) on a diesel truck driveshaft?

Accepted Answer

Vibration and clunking during acceleration or deceleration

Answer

Overheating of the transmission

Answer

Engine stalling at idle

Answer

Excessive brake pedal travel