PO Quality Control & Sampling

Question 1

Why is it important to flush a sample point before collecting a process sample?

Accepted Answer

To purge stagnant or unrepresentative material from the line

Answer

To warm up the sampling equipment

Answer

To meet OSHA confined space requirements

Answer

To reduce sample volume for the laboratory

Question 2

What is a 'composite sample' in process sampling?

Accepted Answer

A sample formed by combining multiple grab samples over time or location

Answer

A sample taken only from the top of a vessel

Answer

A sample tested by multiple laboratories

Answer

A sample that has been filtered and dried

Question 3

Which of the following is the correct chain of custody purpose in process sampling?

Accepted Answer

To document sample integrity from collection through analysis

Answer

To track sample shipping costs

Answer

To ensure the sample reaches the lab quickly

Answer

To assign responsibility for sample disposal

Question 4

A process sample is collected in the wrong container material and the analysis results are anomalous. What is the most likely cause?

Accepted Answer

The sample was contaminated or adsorbed by the incompatible container

Answer

The laboratory equipment was uncalibrated

Answer

The process was operating normally

Answer

The operator sampled at the wrong frequency

Question 5

What does 'specification limits' mean in the context of process product quality?

Accepted Answer

The defined acceptable range of product properties for customer or process requirements

Answer

The legal maximum throughput for a unit

Answer

The maximum instrument measurement range

Answer

The pressure limits for a pipeline

Question 6

When a product quality parameter trends toward its control limit, the operator should:

Accepted Answer

Take corrective action to adjust the process before the limit is reached

Answer

Wait until the limit is exceeded before acting

Answer

Increase sampling frequency only

Answer

Shut down the unit immediately