Vehicle Safety and Control Systems
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Questions and Answers

What is the primary benefit of a locking differential?

  • To increase steering radius
  • To enable faster cornering
  • To allow torque to be developed in all wheels sharing an axle, regardless of their traction (correct)
  • To reduce engine speed

    • When should you engage the differential lock?

  • Below 25mph or when the wheels are not spinning (correct)
  • Above 25mph
  • When the wheels are spinning
  • When driving on dry pavement

    • What happens to steering radius when the differential lock is engaged?

  • It increases (correct)
  • It remains the same
  • It becomes zero
  • It decreases

    • What should you do when the vehicle is freely moving?

    <p>Disengage the differential lock</p> Signup and view all the answers

    What should you not do when tire chains are installed?

    <p>Turn the vehicle with the lock engaged</p> Signup and view all the answers

    What is the primary function of the inter-axle differential?

    <p>To allow for differential action between the axles</p> Signup and view all the answers

    When should you engage the inter-axle differential lock?

    <p>When stopped or moving at slow speed</p> Signup and view all the answers

    What does the Automatic Traction Control function do?

    <p>Applies braking to a drive wheel that is spinning</p> Signup and view all the answers

    What happens to the wheels of a truck with a locking differential when traction is lost on one wheel?

    <p>The wheels act as if they are on a common shaft</p> Signup and view all the answers

    What should you avoid doing when the inter-axle differential lock is engaged?

    <p>Driving on dry pavement</p> Signup and view all the answers

    What is the purpose of the inter-axle differential?

    <p>To compensate for cornering and uneven road surfaces</p> Signup and view all the answers

    What happens when the Automatic Traction Control function is triggered?

    <p>Braking is applied to a spinning drive wheel</p> Signup and view all the answers

    When should you engage the locking differential?

    <p>At slow speeds or when stopped</p> Signup and view all the answers

    What is the benefit of a locking differential in snowy conditions?

    <p>It allows torque to be developed in all wheels sharing an axle</p> Signup and view all the answers

    What should you do when the vehicle is moving freely after engaging the locking differential?

    <p>Disengage the locking differential</p> Signup and view all the answers

    What happens when the inter-axle differential lock is engaged in soft or slippery road conditions?

    <p>Differential action between the axles is eliminated</p> Signup and view all the answers

    What is the result of engaging the inter-axle differential lock in tandem axle trucks on soft or slippery road conditions?

    <p>Differential action between axles is eliminated</p> Signup and view all the answers

    What happens to the wheels of a truck with a locking differential when traction is lost on one wheel?

    <p>All wheels act like they are rotating on a common shaft</p> Signup and view all the answers

    What is the purpose of the Automatic Traction Control function?

    <p>To apply braking to a drive wheel that is spinning</p> Signup and view all the answers

    What should be avoided when engaging the locking differential?

    <p>Engaging the lock above 25mph</p> Signup and view all the answers

    What is the consequence of engaging the inter-axle differential lock on dry pavement?

    <p>Differential action between axles is eliminated</p> Signup and view all the answers

    What is the benefit of a locking differential when one wheel has good traction?

    <p>The wheel with traction is able to keep the truck moving</p> Signup and view all the answers

    When should the inter-axle differential lock be engaged?

    <p>When the vehicle is moving at slow speed or stopped</p> Signup and view all the answers

    What is the result of the Automatic Traction Control function being triggered?

    <p>Braking is applied to a drive wheel that is spinning</p> Signup and view all the answers

    Study Notes

    Locking Differentials

    • A locking differential allows torque to be developed in all wheels sharing an axle, regardless of their traction
    • It enables the drive wheels to act like they are rotating on a common shaft, keeping the truck moving even if one wheel has good traction
    • Never engage the differential lock above 25mph or while the wheels are spinning
    • Steering radius will increase when the lock is engaged
    • Disengage the lock once the vehicle is freely moving, and avoid driving on dry pavement with the lock engaged
    • When tire chains are installed, do not attempt to turn the vehicle with the lock engaged

    Inter-axle Differential Lock (Tandem Axle Trucks)

    • The inter-axle differential provides for necessary differential action between the axles of a tandem drive unit
    • It allows the wheels of either axle to revolve faster or slower than the wheels of the other axle in order to compensate for cornering, uneven road surfaces, and slightly different tire sizes
    • Engage the IAD lock only when stopped or moving at slow speed
    • Never lock the IAD with the rear wheels spinning
    • Disengage the IAD lock once the vehicle is freely moving, and avoid driving on dry pavement with the lock engaged

    Automatic Traction Control

    • The ATC function automatically applies braking to a drive wheel that is spinning
    • Engine speed may also be decreased until traction is achieved

    Locking Differentials

    • A locking differential allows torque to be developed in all wheels sharing an axle, regardless of their traction
    • It enables the drive wheels to act like they are rotating on a common shaft, keeping the truck moving even if one wheel has good traction
    • Never engage the differential lock above 25mph or while the wheels are spinning
    • Steering radius will increase when the lock is engaged
    • Disengage the lock once the vehicle is freely moving, and avoid driving on dry pavement with the lock engaged
    • When tire chains are installed, do not attempt to turn the vehicle with the lock engaged

    Inter-axle Differential Lock (Tandem Axle Trucks)

    • The inter-axle differential provides for necessary differential action between the axles of a tandem drive unit
    • It allows the wheels of either axle to revolve faster or slower than the wheels of the other axle in order to compensate for cornering, uneven road surfaces, and slightly different tire sizes
    • Engage the IAD lock only when stopped or moving at slow speed
    • Never lock the IAD with the rear wheels spinning
    • Disengage the IAD lock once the vehicle is freely moving, and avoid driving on dry pavement with the lock engaged

    Automatic Traction Control

    • The ATC function automatically applies braking to a drive wheel that is spinning
    • Engine speed may also be decreased until traction is achieved

    Locking Differentials

    • A locking differential allows torque to be developed in all wheels sharing an axle, regardless of their traction
    • It enables the drive wheels to act like they are rotating on a common shaft, keeping the truck moving even if one wheel has good traction
    • Never engage the differential lock above 25mph or while the wheels are spinning
    • Steering radius will increase when the lock is engaged
    • Disengage the lock once the vehicle is freely moving, and avoid driving on dry pavement with the lock engaged
    • When tire chains are installed, do not attempt to turn the vehicle with the lock engaged

    Inter-axle Differential Lock (Tandem Axle Trucks)

    • The inter-axle differential provides for necessary differential action between the axles of a tandem drive unit
    • It allows the wheels of either axle to revolve faster or slower than the wheels of the other axle in order to compensate for cornering, uneven road surfaces, and slightly different tire sizes
    • Engage the IAD lock only when stopped or moving at slow speed
    • Never lock the IAD with the rear wheels spinning
    • Disengage the IAD lock once the vehicle is freely moving, and avoid driving on dry pavement with the lock engaged

    Automatic Traction Control

    • The ATC function automatically applies braking to a drive wheel that is spinning
    • Engine speed may also be decreased until traction is achieved

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    Driver Training Knowledge Base PDF

    Description

    Test your knowledge of vehicle safety features, traction control, and winter driving techniques. Learn about locking differentials, tire tread depth, and more.

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