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Difficulty: EasyAccelerating Methods

When putting a commercial motor vehicle in motion from a complete stop, what is the primary reason a driver must accelerate smoothly and gradually?

  1. To prevent mechanical damage to the drivetrain and avoid drive-wheel spinningAnswer
  2. B
    To rapidly build high engine RPM so the driver can shift gears without double clutching
  3. C
    To allow auxiliary retarders to remain engaged continuously when starting on slippery surfaces
  4. D
    To steer out of drive-wheel skids by overpowering traction limits

Answer

Accelerating smoothly and gradually prevents mechanical damage to the drivetrain and keeps the drive wheels from spinning.
Applying power smoothly and gradually allows the commercial vehicle to gain momentum without shocking the clutch, driveshaft, or differential, while ensuring the drive wheels maintain adequate traction with the road surface.

Step-by-Step Solution

1
Identify the standard CDL operating requirement for moving a vehicle from a stop.
Drivers must accelerate smoothly and gradually each time the vehicle is put in motion.
Commercial motor vehicles carry substantial weight, creating high driveline resistance when starting from a standstill.
2
Determine the mechanical and safety rationale behind gradual throttle application.
Gradual acceleration avoids sudden torque shocks to driveline components and prevents loss of tire traction.
Rough acceleration causes severe mechanical wear or component failure and causes drive wheels to spin on slippery or loose surfaces.

Key Concept

Smooth and gradual acceleration principles in commercial vehicle control
Estimated Time:45s
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Topics

Accelerating Methods

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