FREE 310T Drive Train Systems Questions and Answers

Question 1

A truck with a tandem-drive axle setup is operating in slippery conditions.
To improve traction, the driver engages the inter-axle differential lock (power divider).
What is the primary function of this component?

Accepted Answer

It locks the differential action between the forward and rear axles, forcing both driveshafts to rotate at the same speed.

Answer

It locks the differential in each axle, forcing all four wheels to turn at the same speed.

Answer

It transfers all torque to the axle with the most traction.

Answer

It disengages the forward axle, converting the truck to a single-drive axle for better maneuverability.

Question 2

A technician is diagnosing a heavy-duty truck with a manual, non-synchronized transmission. The driver reports a grinding noise and difficulty engaging first and reverse gears only when starting from a complete stop. What is the MOST likely cause of this issue?

Accepted Answer

A failing or improperly adjusted clutch brake.

Answer

Worn synchronizers in the main gearbox.

Answer

A dragging clutch that is not fully disengaging.

Answer

A worn pilot bearing.

Question 3

While road testing a truck, a technician notices a new, speed-dependent vibration that feels like one shake for every revolution of the driveshaft. This type of vibration is classified as what?

Accepted Answer

A first-order vibration.

Answer

A second-order vibration.

Answer

A third-order vibration.

Answer

A torque-induced vibration.

Question 4

A technician is diagnosing a powershift transmission that exhibits harsh, clunky shifting between all gears. The fluid level and quality are correct, and there are no fault codes related to sensors or solenoids. Which of the following components is MOST likely at fault?

Accepted Answer

The valve body.

Answer

The torque converter.

Answer

The transmission oil pump.

Answer

The clutch pack assembly.

Question 5

When inspecting a driveline for vibration, a technician finds that the U-joint operating angles at the transmission output and the differential input are not within ½° of each other. This condition is most likely to cause what type of failure?

Accepted Answer

A second-order vibration and premature U-joint wear.

Answer

Immediate failure of the transmission output shaft.

Answer

Overheating of the differential lubricant.

Answer

A first-order vibration due to imbalance.

Question 6

A driver reports that when attempting to get out of a muddy area, only one wheel on the forward tandem axle and one wheel on the rear tandem axle spin, and the truck loses all traction. The inter-axle lock is functioning correctly. What additional system must be engaged to provide power to the wheels with traction?

Accepted Answer

The full differential lock (cross-lock).

Answer

The clutch brake.

Answer

The engine brake.

Answer

The traction control system override.

A truck with a tandem-drive axle setup is operating in slippery conditions.To improve traction, the driver engages the inter-axle differential lock (power divider).What is the primary function of this component?

A truck with a tandem-drive axle setup is operating in slippery conditions.
To improve traction, the driver engages the inter-axle differential lock (power divider).
What is the primary function of this component?