CQE Inspection and Testing Methods 2

Question 1

What is 'destructive testing' and when is it typically used?

Accepted Answer

Testing that renders the tested specimen unusable, typically used to determine material properties or failure modes

Answer

Destructive testing intentionally damages or destroys the test specimen to determine properties such as tensile strength, impact resistance, or failure modes that cannot be assessed non-destructively.

Question 2

When establishing a calibration interval for measurement equipment, which factor is most important to consider?

Accepted Answer

Usage frequency, measurement criticality, and historical calibration stability

Answer

Calibration intervals should be based on how often and critically the equipment is used, past calibration history, and the consequences of out-of-calibration measurements on product quality.

Question 3

In acceptance sampling, the Lot Tolerance Percent Defective (LTPD) represents:

Accepted Answer

The quality level at which lots should be rejected with a high probability (consumer's risk protection)

Answer

LTPD (also called Rejectable Quality Level) is the poorest quality level the consumer is willing to accept with only a small probability (typically 10%), defining the consumer's risk point on the OC curve.

Question 4

What is the key difference between precision and accuracy in measurement?

Accepted Answer

Precision refers to repeatability of measurements; accuracy refers to closeness to the true value

Answer

Precision describes how closely repeated measurements agree with each other (repeatability), while accuracy describes how close a measurement is to the true or accepted reference value.

Question 5

Which sampling plan standard is most commonly referenced for attribute inspection in US manufacturing?

Accepted Answer

ANSI/ASQ Z1.4

Answer

ANSI/ASQ Z1.4 (formerly MIL-STD-105) is the most widely used attribute sampling standard in US industry, providing sampling plans indexed by AQL for inspection by attributes.

CQE - Certified Quality Engineer Practice Test

CQE - Certified Quality Engineer Practice Test

CQE Inspection and Testing Methods 2