Examkin

Soru

Zorluk: OrtaStopping and Braking Procedures

Commercial motor vehicle braking systems, suspensions, and tires are engineered to operate with heavy cargo. When operating an empty truck, what primary factor causes it to require a longer stopping distance than when it is fully loaded?

  1. A
    The vehicle experiences increased air brake lag time because the brake lines require higher pneumatic pressure when unladen.
  2. B
    The engine retarder must remain continuously active at maximum power, which overpowers the service brakes.
  3. The unladen vehicle provides less tire traction, causing the wheels to bounce and lock up more easily during braking.Cevap
  4. D
    The driver must rapidly pump and release the service brakes to prevent overheating the brake drums on an unladen axle.

Cevap

The unladen vehicle provides less tire traction, causing the wheels to bounce and lock up more easily during braking.
Commercial motor vehicles are designed to achieve optimal braking traction when fully loaded. An empty vehicle lacks sufficient downward weight on the axles, leading to reduced tire grip, increased wheel hop, and premature wheel lockup, all of which lengthen the overall stopping distance.

Adım Adım Çözüm

1
Identify the relationship between vehicle cargo weight and tire traction during braking.
Heavier loads exert downward force on the axles, pressing the tires firmly onto the road surface and maximizing friction.
Effective braking force depends directly on the friction interface between the tire tread and the pavement.
2
Analyze how an empty commercial vehicle responds to service brake application.
An unladen truck has significantly less downward force, causing the stiff suspension to bounce and the wheels to break traction or lock up.
Commercial vehicle brakes, springs, and tires are designed to perform with the weight of a full load.
3
Conclude how reduced traction and wheel hop affect the total stopping distance.
Reduced tire-to-road contact and wheel lockup degrade deceleration efficiency, extending total stopping distance.
A skidding or bouncing tire has significantly less stopping traction than a rolling tire with full downward weight.

Anahtar Kavram

Vehicle Weight and Traction in Stopping Procedures
Tahmini Süre:1m 0s
Bu soruyu puanla

Konular

Stopping and Braking Procedures

Bu konudan daha fazla soru