What is the primary purpose of a diesel particulate filter (DPF) in heavy trucks?
Correct!
Wrong!
DPFs trap particulate matter to reduce emissions from diesel engines.
Which component is CRITICAL for proper air brake system operation?
Correct!
Wrong!
The air dryer removes moisture to prevent brake system freeze-ups.
What is the proper torque sequence for heavy-duty wheel lug nuts?
Correct!
Wrong!
Star pattern tightening ensures even clamp load on the wheel.
Which system uses DEF (Diesel Exhaust Fluid) in modern trucks?
Correct!
Wrong!
SCR systems use DEF to reduce NOx emissions.
What is the function of a fifth wheel locking mechanism?
Correct!
Wrong!
The fifth wheel securely connects the tractor to the trailer.
Which tool is ESSENTIAL for diagnosing electronic truck systems?
Correct!
Wrong!
Heavy-duty scan tools read manufacturer-specific fault codes.
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What maintenance is required for truck air brake systems?
Correct!
Wrong!
Regular draining prevents moisture buildup in air tanks.
Which component is part of a truck's ABS system?
Correct!
Wrong!
Wheel speed sensors provide data for anti-lock braking.
What is the purpose of a jake brake in diesel trucks?
Correct!
Wrong!
Engine brakes help control speed without using service brakes.