CST Vehicle Scale Systems & Applications

Question 1

What is the federal maximum gross vehicle weight (GVW) limit for vehicles operating on U.S. interstate highways?

Accepted Answer

80,000 lbs

Answer

Federal law limits gross vehicle weight to 80,000 lbs on interstate highways under the Federal Bridge Formula.

Question 2

What type of foundation is most commonly required for a properly installed pit-mounted truck scale?

Accepted Answer

Reinforced concrete with drainage provisions

Answer

Pit-mounted truck scales require reinforced concrete foundations with drainage to prevent water accumulation that can damage load cells and electronics.

Question 3

What is the primary purpose of a summing board (junction box) in a multi-load-cell vehicle scale?

Accepted Answer

To combine and balance individual load cell signals into one output

Answer

A summing board combines signals from multiple load cells and allows trim resistors to balance the outputs, providing a single accurate signal to the weight indicator.

Question 4

What is the minimum deck length typically required for a single-draft weighing of a standard 18-wheel tractor-trailer?

Accepted Answer

70 feet

Answer

A standard tractor-trailer combination is approximately 70 feet long, requiring a 70-foot deck to ensure the entire vehicle is on the scale during a single-draft weighing.

Question 5

What is the primary purpose of approach ramps on a truck scale installation?

Accepted Answer

To ensure vehicles travel in a controlled, level manner onto the deck preventing shock loading

Answer

Approach ramps ensure vehicles transition smoothly and levelly onto the scale deck, preventing shock loading and dynamic errors that would compromise accuracy.

(CST) Certified Scale Technicians Practice Test

(CST) Certified Scale Technicians Practice Test

CST Vehicle Scale Systems & Applications