CST PM & Calibration Schedules 3

Question 1

A legal-for-trade retail scale must be re-verified after repair. Which agency in the United States has authority over weights and measures for commercial transactions?

Accepted Answer

State Weights and Measures agencies

Answer

State Weights and Measures agencies, operating under authority derived from NIST HB 44, are responsible for regulating commercial weighing devices.

Question 2

What does 'eccentricity test' assess during a scale PM?

Accepted Answer

The uniformity of the scale's response when a load is placed at different points on the platform

Answer

An eccentricity (off-center load) test verifies that placing a load at different platform positions produces readings within tolerance.

Question 3

During a PM, a technician observes that a crane scale's hook and swivel show visible wear grooves. The technician should:

Accepted Answer

Tag the scale out of service until the hook and swivel are replaced

Answer

Worn hooks and swivels are a safety hazard that can lead to catastrophic failure under load; the scale must be removed from service until repaired.

Question 4

ISO 9001 quality management systems require calibration records to be retained for how long?

Accepted Answer

As defined by the organization's own documented retention policy

Answer

ISO 9001 requires organizations to retain calibration records as documented information but allows the retention period to be set by the organization's own procedures.

Question 5

A substitution weighing technique is used during calibration to reduce uncertainty. What is its main advantage?

Accepted Answer

It cancels systematic errors of the balance by comparing the unknown mass against a reference on the same pan in the same position

Answer

Substitution weighing places both the reference and unknown weights in the same pan position, canceling balance systematic errors and reducing uncertainty.

(CST) Certified Scale Technicians Practice Test

(CST) Certified Scale Technicians Practice Test

CST PM & Calibration Schedules 3