CST Vehicle Scale Systems & Applications 2

Question 1

What is weigh-in-motion (WIM) technology primarily used for in vehicle weighing applications?

Accepted Answer

Screening or identifying potentially overweight vehicles without requiring them to stop

Answer

WIM systems screen vehicles at highway speeds to flag potentially overweight vehicles for further static inspection; they are generally not approved as standalone legal-for-trade devices.

Question 2

What is the primary operational difference between a portable axle scale and a full-platform truck scale?

Accepted Answer

Portable axle scales weigh only individual axles sequentially, while platform scales weigh the entire vehicle simultaneously

Answer

Portable axle scales measure one axle group at a time and sum the readings, while full-platform (truck) scales capture the entire vehicle weight in a single or multiple drafts simultaneously.

Question 3

When testing a vehicle scale for repeatability, what is the correct procedure per standard weights and measures practice?

Accepted Answer

Apply the same test load at least three times and verify that all readings fall within the allowable tolerance

Answer

Repeatability testing requires applying an identical test load a minimum of three times to confirm the scale provides consistent readings within tolerance on each application.

Question 4

What is the most common cause of rocking or instability in a vehicle scale deck?

Accepted Answer

Improper load cell mounting, unlevel check rods, or uneven foundation support

Answer

Deck instability (rocking) is most frequently caused by uneven support at load cell mounting points, improperly adjusted check rods, or differential settlement in the foundation.

Question 5

What is the function of a check rod (restraint rod) on a vehicle scale deck?

Accepted Answer

A mechanical rod that limits horizontal movement of the deck while allowing free vertical deflection for weighing

Answer

Check rods are mechanical restraints that prevent excessive lateral or longitudinal movement of the scale deck while permitting the free vertical movement needed for accurate weight measurement.

(CST) Certified Scale Technicians Practice Test

(CST) Certified Scale Technicians Practice Test

CST Vehicle Scale Systems & Applications 2