CDT Vehicle Operations & Maintenance 2

Question 1

When should a commercial driver perform a post-trip inspection?

Accepted Answer

At the end of every driving shift before releasing the vehicle

Answer

Federal regulations require a post-trip inspection report at the end of each driving shift to document any defects found.

Question 2

What is the primary purpose of the vehicle's differential?

Accepted Answer

To allow drive wheels to rotate at different speeds during turns

Answer

The differential allows the outer and inner drive wheels to rotate at different speeds when the vehicle turns, preventing tire scrub.

Question 3

What does a red triangle warning light on the dashboard typically indicate?

Accepted Answer

A hazard warning system activation or critical fault

Answer

A red triangle or warning indicator typically signals a critical system fault requiring immediate attention before continuing operation.

Question 4

Which of the following best describes 'jake braking' (engine brake)?

Accepted Answer

Compressing air in cylinders to create engine retardation

Answer

Jake braking uses the engine's compression to retard vehicle speed, reducing wear on service brakes especially on downgrades.

Question 5

A driver notices the steering wheel vibrates at highway speeds but not at lower speeds. The MOST likely cause is:

Accepted Answer

Wheel imbalance or tire defect

Answer

Steering wheel vibration at highway speeds is classically caused by wheel imbalance or a defective tire creating oscillation at higher RPMs.

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